Crystallization of Poly(ethylene oxide) and Melt-Miscible PEO Blends
Crystallization of Poly(ethylene oxide) and Melt-Miscible PEO Blends
复制标题
DOI：
10.1021/ma981169o
复制
发表时间：
1999-02
期刊：
影响因子：
5.5
通讯作者：
Limin Wu;M. Lisowski;S. Talibuddin;J. Runt
中科院分区：
文献类型：
--
作者：
Limin Wu;M. Lisowski;S. Talibuddin;J. Runt
在一定的结晶温度范围内测量了聚环氧乙烷和四种模型、熔体混溶共混物的球晶生长速率。可混溶的稀释剂分为两类：与 PEO 表现出相对较弱的分子间相互作用的稀释剂和表现出强相互作用的稀释剂。一般来说，在给定的结晶温度下，具有强相互作用聚合物的共混物的生长速率明显低于具有可比Tg的弱相互作用聚合物的共混物。对于第一个近似值，当通过过冷度和 T − Tg 标准化时，PEO 和共混物的增长率可以“叠加”。此外，在较高的 Tc 和稀释剂浓度下，特别是对于具有强相互作用稀释剂的混合物，生长速率从 G ∝ t0 减慢至 G ∝ t-1/2，与扩散控制生长的交叉一致。使用 LHM 模型分析 PEO 生长速率，得出 II 区结晶的 σe ∼ 40 ergs/cm2。对于共混物，流动性是...
Spherulitic growth rates for poly(ethylene oxide) and four model, melt-miscible blends were measured over a range of crystallization temperatures. The miscible diluents fall into two classes: those exhibiting relatively weak intermolecular interactions with PEO and those exhibiting strong interactions. Generally, at a given crystallization temperature, growth rates for blends with the strongly interacting polymers are considerably lower than those with weakly interacting polymers with comparable Tgs. To a first approximation, growth rates for PEO and the blends can be “superposed” when normalized by the degree of supercooling and T − Tg. In addition, at higher Tc and diluent concentrations, particularly for blends with strongly interacting diluents, the growth rate slows from G ∝ t0 to G ∝ t-1/2, consistent with a crossover to diffusion-controlled growth. Analysis of PEO growth rates using the LHM model yields σe ∼ 40 ergs/cm2 for crystallization in regime II. For the blends, the mobility as a function o...