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首页> 外文期刊>Journal of Applied Polymer Science >Nitroxide-terminated poly (styrene-co-diethyl fumarates) and derived block copolymers
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Nitroxide-terminated poly (styrene-co-diethyl fumarates) and derived block copolymers

机译：一氧化氮封端的聚（富马酸乙二酯共聚物）和衍生的嵌段共聚物

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Copolymerization of styrene (S) and diethyl fumarate (DEF) at 125degreesC in the presence of 2,2,6,6-tetramethylpiperidin-1-yloxyl radical (TEMPO) and initiated with a thermal initiator, 2,2'-azobisisobutyronitrile (AIBN), was studied. The molar fraction of DEF in the feed, F-DEF varied within 0.1-0.9. An azeotropic composition, (F-DEF)(A) = 0.38, was found for the copolymerization under study. At F-DEF = 0.1-0.4, a quasi-living process was observed, transforming to a retarded conventional radical copolymerization at a higher content of DEF in the initial mixtures. The obtained TEMPO-terminated S-DEF copolymers were used to initiate polymerization of styrene. Poly(styrene-co-diethyl fumarate)-block-polystyrene copolymers were prepared with molecular weight distributions depending on the amount of inactive polymer chains in macroinitiators, as indicated by size-exclusion chromatography. A limited miscibility of the blocks in the synthesized block copolymers was revealed by using differential scanning calorimetry. (C) 2002 Wiley Periodicals, Inc. [References: 32]
机译：苯乙烯（S）和富马酸二乙酯（DEF）在2,2,6,6-四甲基哌啶-1-基氧基（TEMPO）存在下于125°C进行共聚合，并用热引发剂2,2'-偶氮二异丁腈（AIBN）引发），进行了研究。进料中DEF的摩尔分数F-DEF在0.1-0.9之间变化。在研究中发现共沸组成（F-DEF）（A）= 0.38。在F-DEF = 0.1-0.4时，观察到准活性过程，该过程在初始混合物中以较高的DEF含量转化为延迟的常规自由基共聚。将获得的TEMPO封端的S-DEF共聚物用于引发苯乙烯的聚合。如尺寸排阻色谱法所示，制备聚（苯乙烯-富马酸二乙酯-富马酸二乙酯）-嵌段-聚苯乙烯共聚物，其分子量分布取决于大分子引发剂中惰性聚合物链的数量。通过使用差示扫描量热法揭示了在合成的嵌段共聚物中嵌段的有限的混溶性。 （C）2002 Wiley Periodicals，Inc. [参考：32]

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