Diffusion Behavior of Polystyrene/Poly(2,6-dimethyl-1,4-phenylene oxide) (PS/PPO) Nanoparticles Mixture: Diffusion Mechanism for Liquid PS and Glassy PPO
Diffusion Behavior of Polystyrene/Poly(2,6-dimethyl-1,4-phenylene oxide) (PS/PPO) Nanoparticles Mixture: Diffusion Mechanism for Liquid PS and Glassy PPO
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DOI：
10.1021/ma402200d
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发表时间：
2014-03
期刊：
影响因子：
5.5
通讯作者：
Linling Li;Xiaoliang Wang;Dongshan Zhou;Chao Teng;Qing Sun;G. Xue
中科院分区：
文献类型：
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作者：
Linling Li;Xiaoliang Wang;Dongshan Zhou;Chao Teng;Qing Sun;G. Xue
研究了用纳米沉淀法制备的聚苯乙烯/聚(2，6-二甲基-1，4-苯氧基)(PS/PPO)纳米粒子混合物的扩散行为。通过在PS的玻璃化转变温度和PPO组分的玻璃化转变温度之间对PS/PPO混合物进行热处理，进行了液体PS在玻璃态PPO(L-PS/g-PPO)中的扩散实验。通过跟踪扩散前沿后面富PS区域的Tg演化，利用时间-温度叠加法得到了扩散过程中PS体积分数的主曲线，并基于核壳模型研究了L-PS/g-PPO体系的扩散机理。由于液体/玻璃态聚合物互扩散的扩散机制一直存在争议，因此我们确认PS/PPO纳米粒子混合物的扩散行为符合Fickean机制的特征，而不是Case II机制。初始(D初始)的平移因子(At)和扩散系数(Di)均为零。
We investigated the diffusion behavior of polystyrene/poly(2,6-dimethyl-1,4-phenylene oxide) (PS/PPO) nanoparticles mixture prepared by the nanoprecipitation method. The diffusion experiments of liquid PS into the glassy PPO matrix (l-PS/g-PPO) were conducted by annealing the PS/PPO mixture at temperatures between the glass transition temperatures (Tgs) of the PS and PPO components. By tracing the Tg evolution of the PS-rich domain behind the diffusion front, we obtained the master curve of PS volume fraction during diffusion by time–temperature superposition (TTS) and studied the diffusion mechanism of the l-PS/g-PPO system based on the core–shell model. As there is ongoing debate on the diffusion mechanism for the liquid/glassy polymers interdiffusion, herein we confirm that the diffusion behavior of PS/PPO nanoparticles mixture follows the characteristics of the Fickean mechanism rather than the case II mechanism. Both of the shift factors (aT) and the diffusion coefficients in the initial (Dinitial) o...