Polysulfide networks. In situ formation and characterization of the elastomeric behavior
Polysulfide networks. In situ formation and characterization of the elastomeric behavior
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DOI：
10.1021/ma070179z
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发表时间：
2007-07-10
期刊：
影响因子：
5.5
通讯作者：
Tirelli, Nicola
中科院分区：
文献类型：
--
作者：
Kilcher, Giona;Wang, Lei;Tirelli, Nicola
通过使用含甲基丙烯酸酯和硫醇反应性化合物作为环硫化物阴离子聚合的封端剂，合成了具有窄多分散性和可变链长和可聚合单元密度的多硫化物。这些大分子单体已经被光聚合以产生具有受控交联密度的材料，其转化为受控数量的交联、分支点和死端。由此产生的网络表现出弹性体的行为，可以很容易地通过一个简单的仿射链模型描述，在网络行为的分析，我们在这里还提出了一个溶剂无关的参数的计算合理化的行为的Flory-Huggins参数。这些材料结合了联合收割机简单的制备（->原位过程）、容易描述的机械性能和响应性（对氧化的响应性，这里没有研究），这些特征可以使它们在生物医学应用中具有吸引力。
Polysulfides with narrow polydispersity and variable chain length and density of polymerizable units have been synthesized through the use of a methacrylate-bearing and thiol-reactive compound as an end-capper for episulfide anionic polymerization. These macromonomers have been photopolymerized to yield materials with controlled cross-linking density, which translates into a controlled number of cross-links, branching points, and dead-ends. The resulting networks show elastomeric behavior that can be easily described through a simple affine chain model; in the analysis of the network behavior we here also present the calculation of a solvent-independent parameter for rationalizing the behavior of the Flory-Huggins parameters. These materials combine simple preparation (-> in situ processes), easy description of the mechanical properties, and responsiveness (to oxidationnot studied here), features that could make them attractive for biomedical applications.