Molecular design and synthesis of crosslinked polyimides using radical isomerization of vinylcyclopropane with thiols

Molecular design and synthesis of crosslinked polyimides using radical isomerization of vinylcyclopropane with thiols
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乙烯基环丙烷与硫醇自由基异构化交联聚酰亚胺的分子设计与合成

DOI:
10.1002/app.50529
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发表时间:
2021
影响因子:
3
通讯作者:
Endo Takeshi
Endo Takeshi
中科院分区:
化学3区
文献类型:
--
作者:
Okamoto Shusuke;Sudo Atsushi;Endo Takeshi

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以含乙烯基环丙烷(VCP)的二胺为原料,合成了主链含VCP的反应性聚酰亚胺。它们使用二硫醇的自由基交联与VCP部分的自由基开环反应(RROR)一起进行,以提供在交联部分中具有C = C键的相应交联聚酰亚胺。用热重法和差示扫描量热法研究了交联聚酰亚胺的热性能。结果,交联聚合物中交联度的增加在600°C下表现出大的残余重量。相反,玻璃化转变温度的趋势是相反的,因为作为交联剂的二硫醇单元的量的增加将增强聚合物堆积结构的缓解并激活聚合物链的流动性。
Reactive polyimides bearing a vinylcyclopropane (VCP) moiety in the main chain were successfully synthesized from the corresponding diamine with the VCP moiety. Their radical crosslinking using a dithiol proceeded with the radical ring‐opening reaction (RROR) of the VCP moiety to afford the corresponding crosslinked polyimides with the CC bonds in crosslinking moieties. Thermal properties of those crosslinked polyimides were evaluated by thermal gravimetry and differential scanning calorimetry. As a result, the increase of the crosslinking degree in the crosslinked polymer exhibited great residual weight at 600°C. In contrast, the tendency of the glass transition temperature was inverse because the increase in the amount of dithiol unit as a crosslinker would enhance the mitigation of the polymer packing structure and activates the mobility of polymer chains.
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