Equilibrium Volume Change and Elastic Properties of Poly(N-isopropylacrylamide) Gels Containing Latex Particles
作者:Akifumi Ikehata、Minako Takano、Hideharu Ushiki
DOI:10.1295/polymj.33.554
日期:2001.8
which are the highly dense PNIPA gel phase around the latex particles and the usual PNIPA gel network. It appears that the increment of elasticity against latex concentration could be classified into two mechanisms. The first, in the low latex concentration range, the dense gel phases are dispersed apart each other, the second, in the range of high latex concentration, C≥ 12.0 wt%, the elasticity of the
研究了含有苯乙烯-丁二烯胶乳的聚(N-异丙基丙烯酰胺)(PNIPA)凝胶的平衡体积变化和弹性模量。据认为,乳胶颗粒的存在限制了聚合空间,这也影响了 PNIPA 凝胶的弹性贡献。发现这些凝胶的溶胀行为与在依赖交联密度的情况下发现的非常相似。另一方面,凝胶的拉伸模量急剧增加,尽管这些凝胶似乎已经足够膨胀。假设这种弹性的异常增加取决于结合两种弹性成分的方式,即乳胶颗粒周围的高密度 PNIPA 凝胶相和通常的 PNIPA 凝胶网络。看来弹性相对于乳胶浓度的增加可以分为两种机制。首先,在低乳胶浓度范围内,致密的凝胶相彼此分散,其次,在高乳胶浓度范围内,C≥12.0 wt%,凝胶的弹性服从平行模型,因为形成了具有密集凝胶相的宏观网络与整个凝胶体积重叠。