A thermodynamic polymer cross-linking system based on radically exchangeable covalent bonds
A thermodynamic polymer cross-linking system based on radically exchangeable covalent bonds
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DOI：
10.1021/ma052093g
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发表时间：
2006-03-21
期刊：
影响因子：
5.5
通讯作者：
Takahara, A
中科院分区：
文献类型：
--
作者：
Higaki, Y;Otsuka, H;Takahara, A
利用烷氧基胺单元作为热可逆共价键的热力学共价交联体系被证明。通过加热在侧链上含有烷氧基胺单元的聚（甲基丙烯酸酯），交联反应由于烷氧基胺部分的自由基交换反应而实现。动力学研究表明，交联行为显着依赖于浓度，并在给定的反应时间达到平衡，并已观察到的热力学反应的特征反应行为。通过在过量烷氧基胺的存在下加热交联聚合物来进行去交联反应。结果发现，交联点热解离，反应体系是可逆的化学计量控制下。
A thermodynamic covalent cross-linking system utilizing alkoxyamine units as thermally reversible covalent bonds was demonstrated. By heating the poly(methacrylic ester)s containing alkoxyamine units on the side chain, the cross-linking reaction was achieved as a result of a radical exchange reaction of alkoxyamine moieties. Kinetic studies have revealed that the cross-linking behavior depends remarkably on concentration and reaches equilibrium at a given reaction time, and characteristic reaction behaviors for thermodynamic reactions have been observed. The de-cross-linking reaction wits carried Out by heating the cross-linked polymer in the presence of an excess amount of alkoxyamine. It was found that the cross-linked points thermally dissociate and that the reaction system is reversible under stoichiometric control.