Gelation mechanism and mechanical properties of Tetra-PEG gel
Gelation mechanism and mechanical properties of Tetra-PEG gel
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DOI：
10.1016/j.reactfunctpolym.2013.03.015
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发表时间：
2013-07-01
影响因子：
5.1
通讯作者：
Sakai, Takamasa
中科院分区：
文献类型：
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作者：
Sakai, Takamasa
Tetra-PEG凝胶作为具有被称为聚合物网络的固有特性的极其抑制的非均匀性并且难以控制的聚合物凝胶而引起了广泛关注。四-PEG凝胶通过新的制造方法形成，即，AB型交联偶联，其是相互反应的多臂聚合物之间的缩聚反应，形成聚合物网络。AB型交联偶联在抑制非均相性方面优于常规缩聚。本文着重介绍了凝胶化反应及其与力学性能和结构的关系。该反应从起始到结束（约100 ℃）作为A和B端基的简单二级反应进行。90%），表明两种预聚物的均匀混合。随着聚合物浓度的增加，预测Tetra-PEG凝胶弹性模量的模型从体模转移到仿射网络模型。用Lake-Thomas模型对断裂能进行了预测。这些实验研究还表明，Tetra-PEG凝胶具有非常均匀的网络结构，是评价聚合物凝胶基本物理性能的候选材料。(c)2013爱思唯尔有限公司保留所有权利。
Tetra-PEG gel has drawn much attention as a polymer gel with extremely suppressed heterogeneity, which is known as the intrinsic characteristics of polymer networks, and is difficult to control. Tetra-PEG gel is formed by a novel fabrication method, i.e., AB-type crosslink coupling, which is polycondensation between mutually reactive multi-armed polymers forming a polymer network. AB-type crosslink coupling has advantages on suppressing the heterogeneity over conventional polycondensation. In this review, we focused on the gelation reaction and the relationship between the mechanical properties and structure. The reaction proceeded as a simple second order reaction of A and B end-groups from the initiation to the end (approx. 90%), suggesting the homogeneous mixing of two prepolymers. The model predicting the elastic modulus of Tetra-PEG gel shifts from the phantom to affine network models with an increase in polymer concentration. The fracture energy is well predicted by the Lake-Thomas model. These experimental studies also suggest that Tetra-PEG gel has extremely homogeneous network structure and is a candidate material for evaluating the basic physical properties of polymer gels. (c) 2013 Elsevier Ltd. All rights reserved.