Department of Physics, Indian Institute of Science, Bangalore, 560 012, India.
J Chem Phys. 2013 Jan 7;138(1):014902. doi: 10.1063/1.4773442.
We report the variation of glass transition temperature in supported thin films of polymer nanocomposites, consisting of polymer grafted nanoparticles embedded in a homopolymer matrix. We observe a systematic variation of the estimated glass transition temperature T(g), with the volume fraction of added polymer grafted nanoparticles. We have correlated the observed T(g) variation with the underlying morphological transitions of the nanoparticle dispersion in the films. Our data also suggest the possibility of formation of a low-mobility glass or gel-like layer of nanoparticles at the interface, which could play a significant role in determining T(g) of the films provided.
我们报告了聚合物纳米复合材料支撑薄膜中玻璃化转变温度的变化，该复合材料由聚合物接枝纳米粒子嵌入均聚物基质中组成。我们观察到添加的聚合物接枝纳米粒子的体积分数与估计的玻璃化转变温度 T(g)之间存在系统的变化。我们已经将观察到的 T(g)变化与薄膜中纳米粒子分散的潜在形态转变相关联。我们的数据还表明，在界面处可能形成具有低迁移率的纳米粒子玻璃或凝胶状层，这可能在确定所提供的薄膜的 T(g)方面发挥重要作用。
