最新刊期
卷 ， 期 1 ， 1996
- 摘要：The influence of heat treatment on polyamide 1010 structure of aggregatied state was studied by means of WAXD and SAXS techniques.The results showed thatcrystallinity is better at annealing temperature nearby T=175℃ for polyamide 1010 samples,Tg was approximately 58℃ through extrapolating the Wcnx VS.T curve to Wc,x.=0,which is in agreement with the literature.Based on one dimensional electron density correlation function of partially crystalline polymers,the long period L,thickness of the crystalline lamell -d,thickness of the transition zone and density differece crystalline and amorphous regions,as well as density рc of crystalline phase can be directly derived by SAXS data for polyamide 1010 under various annealing temperatures.
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发布时间：2021-03-19 - 摘要：ehavior of photocrosslinking reaction of side-chain liquid crystalline copolymer P(MPAEB-co-VBC)and P(MPAHB-co-VBC) was investigated.When the sample membrane was irradiated by ultraviolet ray at room temperature for 20 minutes,the percent of gel for quenched membrane was higher than unquenched one for both P (MPAEB-co-VBC)and P(MPAHB-co-VBC),but did not change for homopolymer.When the temperature of samples was changed from room temperature to 100℃, there was not dear difference in percent of gel for quenched P(MPAEB-co-VBC)and P(MPAEB-co-VBC) membranes.It was concluded from these obsrcations, that because of ordered arrangement of mesogen grous in L.C.copolymer,physicocrosslinking macromolecules,which had domain structre,was formed.The domain structure could influence aggregational condition of cinnamate groups in the L.C. polymer chains and resulted in different characteristics from amorphous one.
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发布时间：2021-03-19 - 摘要：rystalline phase compatibilities between LLDPE,HDPE and LDPE was studied through DSC,WAXD,IR and tensile test.It is found that LLDPE which has similar chain structure as HDPE,is compatible with HDPE in crystalline state.While LDPE,which has more different chain structure,has poor compatibility with HDPE. HDPE and LDPE chains are inclined to crystallize separately in the existence of partial chain interpenetration Not only LDPE chains which have larger number of branches penetrating into HDPE crystal,but also HDPE chains,which have smaller number of branches,penetrating into LDPE crystal,can destroy the regularity of the crystal.The formation of cocrystal make the melting points,crysrallinities and crystal dimensions of the blends to be smaller than the linear sum of the two components.Whereas the mechanical properties,espectially in elongational characteristics,improve dramatically.
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发布时间：2021-03-19 - 摘要：The copolymer emulsion of acrylates with glycidyl methacrylate active monomer was prepared by semi -continuous seed emulsion copolymerization to four component copolymer;the copolymer emulsion was characterized by means of TEM,stability,rheological properties etc.,The effect of glycidyl methacrylate(GMA) and its content onthe properties of copolymer emulsion and copolymer films was studied;the self-crosslinking property was investigated by DSC.It has been found that the morphology of copolymer emulsion particle showed core-shell structure,and there is streaky transitive layer between core and shell;thus,the functional groups were at the surface layer of particles as far as possible to make the crosslinking effect of DSC;the srability of electrolyte-resisting and centrifugal stability were decreased with the increase of glycidyl methacrylate content.The electrical conductivity was decreased with the increase of glycidyl methacrylate also.The copolymer emulsion showed non-Newtonian flow behavior and it bears the characteristic of dilatant fluid.The apparent viscosity of copolymer emulsion was increased with the increase of shear stress moreover,the content of GMA affects the apparent viscosity.
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发布时间：2021-03-19 - 摘要：This paper described the preparation of new spiro compound,3,9-dihydro-xyethyl-3',9'-dibenzyl-1,5,7,11-tetraoxaspiro[5,5]undecane (V) from diethyl malonate methyl chloroacetate and benzyl chloride,The structure of V was confirmed by proton,13C NMR and IR spectra as well as elementary analysis,The cationic polymerization of V was performed in the presence of BF3.O(C2H5)2, Low yields(-10%)of the products were caused by the stabilization effect of tetrasubstituents in the spiro rings.The cationic ring-opening polymenrization mechanism was proposed based on the structures of the obtained polymers.The observed phenomena that the mole ratio of carbonate ester group and benzene group in the polymers decreased as the polymerization temperature increased, and the cross linked polymer was obtained in bulk polymerization were discussed.
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发布时间：2021-03-19 - 摘要：Four crosslinked resins containing aza-or thio-azacrown ether structure were.synthesized by the reaction of chloromethylthiirane(MS)[or chloromethyloxirane(MO)]with triethylolamine(N)and diethyloldmine(NH) respectively in the presence of NaH using dioxane as solvent at the temperature of 50-80℃.The possible mechanism is that the monomer MS(or MO) is carried out anionic ring-opening polymerization bythe initiation of-O-Na+(or=N-Na+) to form linear polymer at first and then the further reaction of elimination of NaCl between the macromolecules and sodium salt of N(or NH)gives the crosslinked resin at last.The order of adsorption capacities of resins for noble metals is Au(Ⅲ)(2.5～4.4mmol/g),Pd(Ⅱ)(1.3～2.9mmol/g),Pt(Ⅳ)(0.56～0.76mmol/g).The adsorption capacities of resins containing S and N (MSN,MSNH)for Ag+are much higher (6.6～6.7mmol/g)than those of the resine containing N(1.0～2.5mmol/g).The adsorption percentages of MSN and MSNH for Au(Ⅲ),Pd(Ⅱ),Pt(Ⅳ)in low concentration(20～50μg/ml)are also higher (94～99%)than those of the resins of MON and MONH (10～92%) .
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发布时间：2021-03-19 - 摘要：ccording to stress relaxation curves of phenolphthalein polyether ketone(PEK-C)at different temperatures and the principle of time-temperature equivalence equivalence,the master curve of PEK-C at arbitrary reference temperature is obtained A coupling model(Kohlrausch-Williams-Watts(KWW)is applied to explain quantitatively stress relaxation behaviour's different temperature dependence and the relationship between stress shress relaxation and yield behaviour is established through coupling model.
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发布时间：2021-03-19 - 摘要：The known structure block copolymers could be obtained through anionic polymerization if the solvents and monomers were purified rigorously.This paper described the procedure about the synthesis of poly(butadiene)-block-poly (methyl methacrylate)copolymers.The polarity of solvents used for polymerization affects drastically the tacticity of polybutadiene.As the butadiene polymerized in THF instal of benzene,its Tg increases from -67℃ to -20℃.The results from the characterization of GPC,FTIR,NMR and DMA demonstrated taht the polymers obtained were block copolymers with contents more than 80% 1,4polybutadiene and 70% syndiotactic PMMA.
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发布时间：2021-03-19 - 摘要：For the system of Styrene/n-butyl methacrylate/AIBN,copolymeizations were carried out at two sensitive feed monomer composition points by duplicate experiments at 40.60.80.100.120.140℃ respectively,The compositions of copolymer wereanalysized by NMR.The relative reactivity ratios of styrene and BMA were calculated by the error-in-variables method(EVM) of Mayo-Lowis equation,and 95% joint confidence intervals of the reactivity ratios were also given.The results were in according with the the FTIR results.The suggested reactivity ratios of St-BMA system at different temperature were obtained from the linear of measures reactivity ratios and temperatures by regression treatment.
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发布时间：2021-03-19 - 摘要：Neutally,positively and negatively charged polyionic complexes(PICs)derived from ethylene-vinyl alcohol copolymer(EVA) were prepared by mixing of EVA cation and EVAanions which were obtained by introducing 3-sulfonyl-propanyl phosphoryl and 4-phenyl trimethylammonium iodide onto EVA respectively.The antithrombogenceity of there PICs were tested by recalicification method.It was found that the subshtution degree of hydroxy group in EVA chains were above 60%,the ratio (Ar) of the plasma clotting time of the formed neutrally charge PICs against that of bared glass were 8-13 AI of the negatively charged PIC was as high as 110.The apparent permeability of these PIC membranes for small molecular weight electrolytes or neutral molecules such as NaCl,urea, glucose,etc.were tested to be approximately 10-7cm2/s.
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发布时间：2021-03-19 - 摘要：ased on interfacial molecular disign for PP/Kaolin composites,the effects of modifier on dispersion of filler,crystallization behaviour of PP,rheology property of filled molten and performance were studied.CompositeS have finer dispersion of filler and lower viscosity by the addition of modifier.In the presence of modifier, notched Izod impact strength (SF)of filled PP increased with increasing filler content,When filler content is 30%,SI of modifier treated system is 12 times higher than that of untreated system.
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发布时间：2021-03-19 - 摘要：Co-and terpolymerization of propylene ethylene and butene-1 with highly efficient supported Ziegler -Natta catalysts were investigated.The polymerization activities depended not only on the reaction temperatured,catalyst concentration and the molar ratio of Al/Ti,[DDS]/[TEA] but also on the monomer's composition It was found that the optimum conditions for the polymerization activities were T=50℃,[Ti]=0.1 mM,Al/Ti= 100,[DDS]/[TEA]=0.1; the activities of propylene with ethylene and butene-1(P-E-B)terpolymerization were higher than those of propylene-ethylene(P-E)or propylene-butene-1(P-B)copolymerization under the same conditions.Effects of the monomer composition on the physical properties of co-and terpolymers were also described.With increasing the concentration of the comonomers,the contents of both ethylene and butene-1 in P-E-B terpolymers as well as P-E,P-B copolymers increased;but the intrinsic viscosity (ηin),density,melting point and crystallinity of the ptoducts dectrased.Finally, the microstructures of co- and terpolymers were examined by 13C-NMR spectra,which indicated the existence of long propylene chain sequence in the co- and terpolymers.
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发布时间：2021-03-19 - 摘要：he composite film of lightly sulfonated polystyrene(SPS)and polypyrrole(PPy)was prepared by in situ polymerization of pyrrole in SPS ionomer film using an oxidant.The polymerization of imbibed pyrrole brought about changes in the structure and proper ties of the SPS matrix.The FTIR results showed that there were stronger intermolecular interactions between PPy and SPS by the oxidated PPy as a cation exerted on a-SO3-anion in SPS.The ion-ion interactions led the band of antisymmetric stretching vibration of-SO-3 near 1200cm-1 to split into two bands (1180 and 1211 cm-1). The microphase separation in the SPS/PPy composites was observed by DMTA measurement.The DMTA results indicated that two Tg appeared at 124 and 145 ℃ respectively.The phenomenon of phase separation was considered that the ionic associations in parent SPS film were disrupted by the incorporation of PPy during the in situ polymerization in the mean while causing the variation of the microstructure of SPS.
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发布时间：2021-03-19
Research Article
- 摘要：iquid Crystalline copolyesters containing poly(ethylene terephthalate)(PET) and high proportion of p-hydroxybenzoic acid(PHB) moieties up to 80 mol%,were prepared by conventional(one-step)and two-step polycondenstion processes and the products were studied by visual observation under polarizing microscope thermomechanical analysis and 1H-NMR spectroscopy . The copolyester prepared by one-step process has a blockmicrostructure,as verified by 1H-NMR study.Whereas a more random copolyester with an obviously decreased amount of insoluble fraction was obtained by two-step process.Their soluble fractions have a random sequence distribution and could be dissolved in P-chlorophenol and tetrachloroethane solvent mixture even if the PHB moiety content is as high as 80 mol%.
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发布时间：2021-03-19 - 摘要：series of trialkylamine type chelating resins containing hydroxyl and mercapto groups were synthesized by the reactions of polymers PA with diethylamino-methyloxirane (ON) and diethylamino-methylthiirane(SN) respechvely.The adsorption properties of these resins for some metal ions such as An (Ⅲ),Pd (Ⅱ),Pt(Ⅳ),Ag (Ⅰ),Hg (Ⅱ),Cu (Ⅱ),Zn(Ⅱ) were measured by static method.The results indicated that the resins can adsorb some nobel metal ions effectively.
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发布时间：2021-03-19 - 摘要：The morphology of PVC CPE blended with rigid organic fillers(ROF)and toughening mechanism were studied by TEM and SEM.The results showed that the obvious toughening effect was obtained by filling ROF to PVC CPE matrix.As a result some fibril formed on the broken surface of samples,and CPE distributed in form of network structure in PVC matrix,and ROF in form of particles.Cold drawing of ROF occured and the brittle-ductile transformation of matrix was observeds when the samples were stretched,so that the toughenss of the blends was increased.
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发布时间：2021-03-19 - 摘要：nake-cage resin has the ability of ion retardation and can be regenerated by water as an eluant.It can be specially used in the separation of different electrolytes and deionization of non-electrolytes in concentrated solutions.In this article several snakecage resins containing weak acidic and strong basic groups were synthesized.The effect of crosslinking degree of the cage resin on ion retardation capacity and ion separation ability were studied.These snake-cage resins were used in removing the water soluble nonvolatile impurities from the spinning bath solution.sodium thiocyanate of polyacrylonitrile.Some of them showed satisfactory results.
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发布时间：2021-03-19 - 摘要：method which was used to prepare polyethylene-glucose oxidase membrane by plasma technique was presented.The effects of plasma treatment parameter and grabing condition on the wettability of modified PE film,grafting yield of AA,and the activity of immobilized GOD membrane were studied.IR and XPS were used to analyze the strcture and composition of grafted film and immobilized GOD membrane.
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发布时间：2021-03-19 - 摘要：For the first time,the fullerenes were applied to butadiene polymerization.The behavour of butadiene polymerization with novel fullerenes supported neodynium catalyst system were investigated.The effects of polymerization conditions on the catalytic activity were also examined.It revealed that the function of the fullerenes might is a ligand and asupporter and the mole ratio of Al/Nd and C60/Nd.The aging temperature and polymerization temperature had a relatively effect on catalytic activity.The catalyst system showed much better stability in catalytic for aging time and aging temperature as cpmpared to general neodynium and nikle catalyst systms.
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发布时间：2021-03-19 - 摘要：Morphological changes which are induced in poly(urethane-ester)by annealing and quenching are studied using DSC analysis technique. The samples used in this study are polyether polyurethane elastomers based on either MDI/BHET or MDI/BHET-D hard segments combined with PTMO (Mw=1000) as soft segment,and hard segment homopolymers of MDI/BHET and MDI/BHET-D.DSC measurements taken immediately after the quench show that the soft segment Tg is higher than that of the control,suggesting that the applied thermal history promoted increasing mixing of hard and soft segments. Three endotherms are observed in untreated sample at ligh temperature range.They are attributed to short-range,long-range and microcrystaline ordering of hard segment domains.
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发布时间：2021-03-19 - 摘要：Graft-copolymerization of acrylamide onto starch initiated by the Ce4+-S2O2-8binary system has been studied.It has been found that Ce3+ can be reoxidized to Ce4+ by in silo to achieve a Ce4+→ Ce3+→Ce4+ rreaction cycle that leads to cyclic use of Ce4+ ions and thus significant decrease in the initial concentration of ceric[Ce4+]comparing to the use of ceric initiator alone.Grafting ratios of graft-copolymerization by the Ce4+—S2O2-8binary system have been compared with those seing ceric or persalfate initator respectively. Structures of the grafted copolymers have been determined,and their molecular weights have been calculated.
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发布时间：2021-03-19 -
SYNTHESIS AND CHARACTERIZATION OF BIPHENYL-SCHIFFBASE SIDE CHAIN LIQUID CRYSTALLINE POLYMETHACRYLATE
摘要：The synthesis and Characterization of a new polymer from the monomerN-(p-methacryloyloxybenzylidene)-p-aminobiphenyl(MBAB) by group transfer polymerization and free radical polymerization.The polymer exhibits liquid crystalline behaviour although the mesogenic side chains are directly fixed to the polymethacrylate backbone.The liquid crystalline behaviour of the polymer was characterized by DSC POM.The polymer.shows a dependence of the phase transition temperature on molecular weight.- 18
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发布时间：2021-03-19 - 摘要：New monomer,4-undecylen-[10]-amidoazobenzene was prepared.New polymer,poly(methyl,undecanoic amidoazobenzene-siloxane)was synthesized by hydrosilation reaction of poly(methylhydrosiloxane)with monomer.The chemical structure of monomer and polymer was confirmed by IR and 1H-NMR analysis.The linear dependence of Ar on time in photoisomerization reaction of azobenzene groups of polymer and monomer in benzene solution are in accordence with a first kinetics.km and kp are3.011×10-7·s-1 and 4.350×10-8·s-1,respectively. These results indicate that the macromolecular stucture does not significantly affect the photoisomerization rate,therefore the polymer shows both good mechnical properties stemming form polysiloxane and photochromism stemming form monomer. The quantum yield fo photoisomerization of monomer in benzene solution is 0.37.
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发布时间：2021-03-19 - 摘要：The Helix-Induce and derotation of the copolymers of TrMA and MMA havebeen studied in their solution.i.e.the helix-induce of TrMA belieal chain to MMA segment for random copolymers P(TrMA-co-MMA)s and the derotation of MMA segments to itself helix or TrMA helical conformation for two block copolymers,P(TrMA-b-MMA)s.
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发布时间：2021-03-19
Research Bulletin
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