SYNTHETIC HYDROGELS .3. HYDROXYALKYL ACRYLATE AND METHACRYLATE COPOLYMERS - SURFACE AND MECHANICAL-PROPERTIES
SYNTHETIC HYDROGELS .3. HYDROXYALKYL ACRYLATE AND METHACRYLATE COPOLYMERS - SURFACE AND MECHANICAL-PROPERTIES
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DOI：
10.1016/0032-3861(88)90111-5
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发表时间：
1988-12-01
期刊：
影响因子：
4.6
通讯作者：
TIGHE, BJ
中科院分区：
文献类型：
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作者：
BARNES, A;CORKHILL, PH;TIGHE, BJ
用多种技术研究了羟基烷基丙烯酸酯和甲基丙烯酸酯共聚物的表面和力学性能。这项工作是对本系列前面部分的补充，该部分描述了共聚物结构对水结合性能的影响。水的结构已被证明对机械性能产生深远的影响，无论是在压缩还是在拉伸方面。特别是，差示扫描量热仪所表征的水对凝胶有显著的塑化作用，而非冷冻的水则几乎没有这种作用。同样，冰冻的水对热诱导的转变产生了更显著的影响。由于它的存在，观察到了两个明显的转折点。一种对应于水的冰点，另一种对应于玻璃化转变温度，其值取决于凝胶中“冻结”或“塑化”水的比例。用几种预测和直接测量技术研究了共聚物在水合和脱水状态下的表面性质。综上所述，他们已经建立了对表面自由能的极性和色散成分随共聚物组成和水分含量变化的方式的良好理解。蛋白质吸附和成纤维细胞相互作用技术的使用表明，生物现象在分子水平上对变化做出反应，这是目前的宏观表面能技术无法识别的。
The surface and mechanical properties of copolymers of hydroxyalkyl acrylates and methacrylates have been examined by a variety of techniques. This work is complementary to earlier parts of this series which describe the effect of copolymer structure on water binding properties. Water structure has been demonstrated to exert a profound effect upon mechanical properties whether measured in compression or in tension. In particular, water that is characterized by differential scanning calorimetry as ‘freezing’ water is observed to have a marked plasticizing effect upon the gel, whereas ‘non-freezing’ water has little such effect. Similarly, the ‘freezing’ water produces a more marked effect on thermally induced transitions. Two distinct transition points are observed as a result of its presence. One corresponds to the freezing point of water and the other to a glass transition temperature, whose value depends upon the proportion of ‘freezing’ or ‘plasticizing’ water in the gel. Several predictive and direct measurement techniques have been used to study the surface properties of the copolymers in both hydrated and dehydrated states. Taken together they have established a sound understanding of the way in which polar and dispersive components of surface free energy vary as a function of copolymer composition and water content. Use of protein adsorption and fibroblast cell interaction techniques demonstrate that biological phenomena respond to changes at a molecular level which current macroscopic surface energy techniques are unable to discern.