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橡塑材料与工程教育部重点实验室 青岛科技大学 青岛 266042
E-mail: liuqiang@qust.edu.cn
纸质出版日期:2020-4,
网络出版日期:2019-12-11,
收稿日期:2019-9-30,
修回日期:2019-10-30,
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杨科, 刘强, 文帅, 徐舒心, 施晨琦. 异丁烯与对氯甲基苯乙烯正离子共聚合研究[J]. 高分子学报, 2020,51(4):355-365.
Ke Yang, Qiang Liu, Shuai Wen, Shu-xin Xu, Chen-qi Shi. Study of Cationic Copolymerization of Isobutylene and
杨科, 刘强, 文帅, 徐舒心, 施晨琦. 异丁烯与对氯甲基苯乙烯正离子共聚合研究[J]. 高分子学报, 2020,51(4):355-365. DOI: 10.11777/j.issn1000-3304.2019.19179.
Ke Yang, Qiang Liu, Shuai Wen, Shu-xin Xu, Chen-qi Shi. Study of Cationic Copolymerization of Isobutylene and
以四氯化钛(TiCl
4
)、二氯乙基铝(AlEtCl
2
)、倍半铝(AlEt
1.5
Cl
1.5
)、三氯化铝(AlCl
3
)等路易斯酸为共引发剂,水或枯基醇(CumOH)为引发剂,在−80 °C下的正己烷/二氯甲烷(
V
/
V
= 6/4)的混合溶剂内,研究了异丁烯(IB)与对氯甲基苯乙烯(
p
-CMS)的正离子共聚合. 利用示差凝胶渗透色谱仪(GPC-RI)以及核磁氢谱(
1
H-NMR)对共聚物的表观分子量及分子量分布、共聚组成等进行分析,采用Kelen-Tüdős与Yezreielv-Brokhina-Roskin法计算了单体竞聚率,初步探讨了
p
-CMS与IB正离子共聚合的反应机理. 结果表明,AlEtCl
2
、AlEt
1.5
Cl
1.5
、AlCl
3
均可催化大分子间的烷基化反应,产生凝胶;TiCl
4
作为共引发剂,可以得到无凝胶单峰分布共聚物;邻位氯甲基苯乙烯(
o
-CMS)不能参与共聚,
p
-CMS的共聚活性较低,IB与
p
-CMS的单体竞聚率为
r
IB
= 4.67,
r
p
-
CMS
= 0.70;随反应时间延长,共聚物中
p
-CMS的含量及共聚物分子量均逐渐增加;
p
-CMS单体自身几乎不参与引发,共聚到大分子链后,苄基氯缓慢参与引发,形成支化. 提高共聚合温度至− 60和− 40 °C,聚合速率降低,
p
-CMS的引发活性未发生明显变化.
Cationic copolymerization of isobutylene (IB) and chloromethylstyrene was investigated with
n
-hexane (Hex)/dichloromethane (CH
2
Cl
2
) (
V
/
V
= 6/4) as solvent
TiCl
4
AlEt
1.5
Cl
1.5
AlEt
2
Cl
AlCl
3
as co-initiators and water or cumyl alcohol as initiators. The molecular weight
molecular weight distribution (MWD) and structure composition of the resulting copolymers were analyzed by gel permeation chromatography (GPC) and
1
H-NMR spectroscopy. The reactivity ratios were determined by Kelen-Tüdős and Yezreielv-Brokhina-Roskin formula
and the copolymerization mechanism was proposed. It was found that co-initiators with strong Lewis acidity
such as AlEtCl
2
AlEt
1.5
Cl
1.5
and AlCl
3
can catalyze intermolecular alkylations to form gels while no gel formed with the relatively weaker TiCl
4
. The chloromethylstyrene with para-substituent
i
.
e
.
p
-(chloromethyl)styrene (
p
-CMS) was found to have a low reactivity during the copolymerization with IB (
r
IB
= 4.67
r
p
-CMS
= 0.70) while the ortho-isomer exhibited no activity. The chemical structure of resulting copolymers indicated that
p
-(chloromethyl)styrene cannot initiate the polymerization of IB which may be due to its low initiation rate compared to the highly active cumyl group at
p
-CMS/IB molar ratio of 4.11. However
the benzyl chloride group in the formed copolymer chain can slowly initiate polymerization of IB and
p
-(chloromethyl)styrene
forming branched structures. The content of
p
-(chloromethyl)styrene increased with increasing molecular weight and monomer conversion. Systematic research on the branched structure
rheological properties and other physical properties of the resulting copolymers is in progress.
异丁烯对氯甲基苯乙烯竞聚率正离子共聚合支化
Isobutylenep-(Chloromethyl)styreneReactivity ratioCationic copolymerizationBranching
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