Abstract

The macromolecular reaction of interchain cross-metathesis between polynorbornene and poly(5,6-epoxy-1-octenamer) in the presence of the first-generation Grubbs catalyst is studied. Chemically stable poly(5,6-epoxy-1-octenamer) is obtained through metathesis polymerization of 5,6-epoxycyclooct-1-ene with the second-generation Grubbs ruthenium catalyst. New random multiblock copolymers of norbornene and 5,6-epoxycyclooct-1-ene with different average block lengths determined by the reaction time, solvent type, and concentrations of the catalyst and initial homopolymers are synthesized and characterized by NMR, GPC, and DSC. Despite a distance between the epoxy substituent and the reaction center (double bond), poly(5,6-epoxy-1-octenamer) shows a lower activity in the cross-metathesis reaction with polynorbornene compared to unsubstituted polyoctenamer. The influence of epoxy groups present in the backbones of homopolymer and norbornene–cyclooctene multiblock copolymers on their thermal characteristics is studied. It is shown that the glass transition and melting temperatures increase with the concentration of epoxy groups upon the incorporation of an oxirane fragment into both homopolymers and copolymers. The crystallinity of poly(5,6-epoxy-1-octenamer) increases with the content of trans-С=С bonds in the polymer.

中文翻译：

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聚降冰片烯与聚（5,6-环氧-1-辛烯单体）的交叉复分解

抽象的

研究了在第一代Grubbs催化剂存在下聚降冰片烯和聚（5,6-环氧-1-辛烯单体）之间链间复分解的大分子反应。通过在第二代Grubbs钌催化剂上进行5,6-环氧环辛-1-烯的复分解聚合反应，可获得化学稳定的聚（5,6-环氧-1-辛烯基）。合成了降冰片烯和5,6-环氧环辛-1-烯的新型无规多嵌段共聚物，其平均嵌段长度由反应时间，溶剂类型，催化剂和初始均聚物的浓度决定，并通过NMR，GPC和DSC进行了表征。尽管环氧取代基与反应中心（双键）之间存在距离，但聚（5，与未取代的聚辛烯单体相比，6-环氧-1-辛烯单体在与聚降冰片烯的交叉复分解反应中显示出较低的活性。研究了均聚物和降冰片烯-环辛烯多嵌段共聚物的骨架中存在的环氧基对其热特性的影响。结果表明，当环氧乙烷片段同时掺入均聚物和共聚物中时，玻璃化转变温度和熔融温度随环氧基浓度的增加而增加。聚（5,6-环氧-1-辛烯单体）的结晶度随含量的增加而增加 结果表明，当环氧乙烷片段同时掺入均聚物和共聚物中时，玻璃化转变温度和熔融温度随环氧基浓度的增加而增加。聚（5,6-环氧-1-辛烯单体）的结晶度随含量的增加而增加 结果表明，当环氧乙烷片段同时掺入均聚物和共聚物中时，玻璃化转变温度和熔融温度随环氧基浓度的增加而增加。聚（5,6-环氧-1-辛烯单体）的结晶度随含量的增加而增加聚合物中的反式С=С键。