最新刊期
      卷 ， 期 2 ， 1978

        Research Article

      • Chai Zhi-kwan
        Issue 2, Pages: 65-79(1978)
        摘要：The simplified Ouano’s diffusion equation has been SOlved with a nonuniforln cylindrical pore model for the gel and all appropriate choice of D．(M)=KDM-γ, in which γ．depends on the pore structure．Experimental GPC data in the literature have been suceessfully simulated on a computer with γ．and the pore uniformity parameter φ as two adjustable parameters．The experiments of Haller and of Yau on the flow rate dependence of the elution peak can be explained from our analytical solution of the diffusion equation in Gram-Charliers’series form．Yan’s formula for KGPC can be shown to be not a theoretically strict one．It is pointed out that if V of monodisperse standard amples obey Benoit’s universal calibration，OB,α3B，α4B and peak spreading function G(v一y) should also obey universal calibration．This explains Tung’s experi-mental discovery that OB is dependent on elution volmnes only and independent on chemical constitution of the polymer．Computer simulation has been carried out for the variation of peak spreading function for 160 cases of gel and column operation conditions (4 bead sizes×2 types of pore distribution×4 flow rates×5 packing effieiencies)．Limpert’s experiment concerning the existence of a maximum column efficiency in fine beads of gel at certain flow rate can be explained by our material balance equation，and it is pointed out that the best resolution for polymer sample would not necessarily occur at this flow rate．Approximate relations for calculating Mn(t)/Mn (∞) and Mw(t)/Mw(∞) from the total column efficiency are also formulated．  
          
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      • Chao Ve-hsiao,Chung Jin-fu,Voong Sing-tuh
        Issue 2, Pages: 80-87(1978)
        摘要：As a bifunctional monomer polyethylene glycol dimethacrylate is the principle constituent of anaerobic adhesives．In the presence of dimethyl t01uidine(DMT), sac．charin，hydroquinone，cuprous．ion or oxalic acid the oxidation of triethylene glycol dimethacrylate(TEGD)at 70±2℃ and room temperature were studied respectively．It is shown that DMT or cuprous．ion will accelerate．while hydroquinone or oxalic acid will suppress the oxidation of TEGD． Saccharin will also accelerate the oxidation of TEGD in the presence of DMT．Oxygen obsorption of anaerobic adhesives were alSo studied．It is found that anaerobic adhesive is a system which will absorb oxygen gradually and continously．The effect of various constituents in the anaerobic adhesives on the oxygen absorption of TEGD as well as on the stability of the system seems to be parallel with that on the oxidation of TEGD．SO DMT or cuprous．ion will accelerate oxygen absorption and reduce the stability of TEGD．while oxalic acid will suppress oxygen absorption and increase the stability of TEGD；the corresponding eftects of CHPO and saccharin are rather weak but distinct acceleration is observed with saceharin in the presence of DMT．  
          
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      • Chiou Hsing-yu,Wang Nai-pin,Chang Feng-chu,Wang Tsui-chu,Piug Hsueh-cheng,Mao Ying-chieh,Shih Kuei-lin,An Ju-pin
        Issue 2, Pages: 88-95(1978)
        摘要：In the polymerization of ethylene by TiCl4-MgCl,-AlCla/Al(i-Bu)s-Zn(i-Bu)2 catalyst system, the influences of Zn(i-Bu)2 on the catalytic activity and the molecular weight of polyethylene has been studied. It is concluded that the molecular weight of polyethylene may be effectively controlled by Zn(i-Bu)2 alt proper conditions of polymerization.  
          
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      • Issue 2, Pages: 96-102(1978)
        摘要：The base-catalyzed rapid polymerizati on of caprolactam applied to the spinning of synthetic fiber was investigated．Acetanilide was used as molecular weight stabi-lizer，which could efficiently control the course of polymerization and to obtain the polymer with stable viscosity．The scale-up experiments on continuous polymeriza-tion．and direct spinning were run smoothly．The spun multifilaments had tensile strength vf 5—6 g/denier and elongation of 19—25％，comparable to the same grade nylon 6 product from the hydrolytic polFmerization．The time of polymerization wag two to two and half hours，while in the ordinary hydrolytic polymerization process，20一30 hours or more was necessary．  
          
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      • Ho Ping-lin,Liu Tsao
        Issue 2, Pages: 103-109(1978)
        摘要：After the graft eopolymer of styrene-divinyl benzene．rubber had been extracted first with petroleum ether and then with a mixture of methyl ethyl ketone and me-thanol in the soxhlet extractor in order to get rid of the linear polymer，the degree of unsaturation was determined．From the experimental results．it was shown that the degree of unsaturation in the graft eopolymer of S-DVB-R was not decreased．The graft eopolymer which，having been extracted，possesses higher swelling eoef-ficient tjlan that of the eopolymer of S-DVB Was ehlVromethylated and amlnated by the ordinary method． It was discovered that it tovk a longer time for the ehlorome．thylation of copolymer containing rubber than that，it did nbt contain any．The pro-duct thus obtained was tested for meehanical strength under wet condition．it was found that the gran,ular particles with an average diameter of 0.64 mm were not bro-ken until an average weight of 700 g was added on．They also had a better elasticdty,and tenaeity．By the indica,tvr method，the exchange velocity of the ffewly prepared resin was ditermined with hydrochloric acid．The diffusion coefficient was calculated according to the method adopted by Reiehenbery．The result showed that the new resin posses．ses la．higher diffusion eoefficient．The new resin also possesses higher water content and lower density than those of the vrdinary resin．  
          
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      • Lu Tun-chin,Chou En-lo,Liu Ting-hui
        Issue 2, Pages: 109-113(1978)
        摘要：High molecular weight polyoxymethylene was obtained from trioxane crystal by solid state polymerization with γ-irradiation from Co80 source. The crystal structure of trioxane was accurately determinated. By using the crystal structure model of trioxane, the ring-opening polymerization mechanism of trioxane by γ-irradiation may be fairly well explained. Polyoxymethylene obtained by solid state polymerization of trioxane may have two types of molecular chains with different orientations, one parallel to the C-axis of trioxane,while the other forming an angle of 75°37'with the C-axis.  
          
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      • Lu Yun-chin,Chou En-lo,Liu Jen-ju,Huang Jy-hui
        Issue 2, Pages: 114-118(1978)
        摘要：Polyoxymethylene (polytrioxane) with wry high degree of erystallinity cain be obtained by γ-irradiation of trioxane single crystals with Co60 source．In the rotation diagram of polytrioxane obtained by γ-irradiation of trioxane there appear some new diffraction spots in addition to that for ordinary polyoxymethylene．Polytrioxane can be splitted into fibers along the C-axis of the original trioxane crystal．The new diffraction spots showing on the rotation diagram would gradually disappear by heat treatment of the sample．By comparing the spaces occupied by polytrioxane and trioxane molecules，we consider that there are four kinds of crystalline zones with different orientation in the polytrioxane crystals，which join together forming many crankshaft-shaped crys-tallites.  
          
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        Research Bulletin

      • Chang Hung-tse,Tung Shiu-tze,Voong Sing-tuh
        Issue 2, Pages: 119-123(1978)
        摘要：Polytetramethylene glycol (PTMG) was prepared by the ring-opening polymerization of tetrahydrofuran using a binary catalyst of 21% fuming sulfuric acid and perchloric acid with the once-through yield about 60% and the ultimate yield around 90-98%. The molecular weight of PTMG was controlled in the range of 1000-4500 by varying the binary catalyst system.The recovered tetrahydrofuran can be reused for polymerization after distilling with a short column and drying by sodium hydroxide.  
          
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      • C. C. Li,Lin Sy-tsong,Ruey Min-jiuan,Lei Sheue-lian,Wang Dah-chyi,Yao Sue-fang,Bnu Moo-Ian,Shyu Ma-lin
        Issue 2, Pages: 124-125(1978)
        摘要：The methylphenylsilicone resin, NJ-7401, has been prepared by cohydrolyais and copolycondensation of methyltrichlorosilane, dimethyldichlorosilane and phenyltrichlo-rosilane. The values of CH3+C6H5/Si and C6H5/CH3+C6H5 of resin are 1.2 and 0.5 res-pectively. The resin is suitable for the preparation of molding powder for the encapsulation of electronic devices.  
          
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      • CHEN Yuan-yin,LIU Ji-wan,Wang Yu-hua,LIU Zhen-hua,MAI Cai-song
        Issue 2, Pages: 126-128(1978)
        摘要：The specific behaviour of some inorganic salts as diluents in melt-polyeondensa-tion of the potassium salt of 4-chloro-4'-hydroxy diphenyl sulfone under reduced pressure was studied. Alkali metal salts have little or no effect, but alkali earth metal and other metal salts depress the product molecular weight greatly. It was shown that sodium chloride can be used as solid diluent to give better temperature control in the polycondensation reaction.  
          
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