The Growth Process of the Soluble Cross-Linked Macromolecule of PU

F. Li, P. Jiang, Boyue Wu, Rui-rui Sun, Jun Chen, Dongping Liu, L. Zhong, Yanfen Wang
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Abstract

TEM pictures that were taken at different polymerization times during the formation process of the in- tramolecularly cross-linked macromolecule (ICM) indicate that ICM growth undergoes three stages. At the first stage, monomers (i.e. prepolymers) react with each other to form small coils, called "dot molecules" (DM), which are shown as small black dots in TEM pictures. At the second phase, the reaction of functional groups on the surface of DMs produces globular intramolecularly cross-linked macromolecules which are called pre-ICMs. At the third stages, the globular pre- ICMs react with each other to form ICMs. As soon as DMs formed, they aggregate into molecular cluster. DMs are re- stricted within the molecular cluster. This state of aggregation is beneficial to reaction between DMs, since a higher fre- quency of collision can occur in the molecular cluster. In fact, the molecular cluster is the key polymerization site in the controllable cross-linking polymerization system.
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聚氨酯可溶交联大分子的生长过程
分子内交联大分子(ICM)形成过程中不同聚合时间的TEM图像表明,ICM的生长经历了三个阶段。在第一阶段,单体(即预聚物)相互反应形成小线圈,称为“点分子”(DM),在TEM图片中显示为小黑点。在第二阶段,DMs表面官能团的反应产生球形分子内交联大分子,称为预icms。在第三阶段,球状的预icm相互反应形成icm。dm一旦形成,就会聚集成分子簇。DMs被限制在分子簇内。这种聚集状态有利于DMs之间的反应,因为在分子簇中可以发生更高频率的碰撞。实际上,分子簇是可控交联聚合体系中的关键聚合位点。
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