Crystallization kinetics of poly(ethylene oxide) in poly(ethylene oxide)-polystyrene-poly(ethylene oxide) triblock copolymers
Crystallization kinetics of poly(ethylene oxide) in poly(ethylene oxide)-polystyrene-poly(ethylene oxide) triblock copolymers
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DOI：
10.1021/ma9616118
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发表时间：
1997-07
期刊：
影响因子：
5.5
通讯作者：
G. Floudas;C. Tsitsilianis
中科院分区：
文献类型：
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作者：
G. Floudas;C. Tsitsilianis
本文用X射线衍射、光学显微镜、差示扫描量热法和流变学方法研究了聚氧化乙烯（PEO）的均聚物和两种聚氧化乙烯-聚苯乙烯-聚氧化乙烯（PEO-PS-PEO）三嵌段共聚物的结构和结晶动力学。可结晶块形成具有球晶超结构的多层层状结构，并且非晶相被并入层间PEO区域中。无定形中间嵌段对PEO的局部结构没有影响，但对（i）结晶度，（ii）平衡熔融温度，和（iii）PEO域的厚度具有强烈的影响。结晶通过成核和生长进行，并且在相等过冷的条件下在三嵌段中更快。剪切力对结晶过程的形状有显著影响，但对平均结晶时间影响不大。在这里，我们可以看到，Rhe...
The structure and crystallization kinetics of poly(ethylene oxide) (PEO) in the homopolymer and in two triblock copolymers of poly(ethylene oxide)−polystyrene−poly(ethylene oxide) (PEO−PS−PEO), crystallized from the ordered melt, have been studied respectively with X-ray diffraction, optical microscopy and differential scanning calorimetry, rheology. A multilayer lamellar structure with a spherulitic superstructure is formed by the crystallizable block, and the amorphous phase is incorporated in the interlamellar PEO regions. The amorphous midblock exerts no influence on the local structure of PEO but has a strong influence on (i) the crystallinity, (ii) the equilibrium melting temperature, and (iii) the thickness of PEO domains. Crystallization proceeds via nucleation and growth and is faster in the triblocks under conditions of equal supercooling. Shear has a pronounced effect on the shape of the crystallization process but little effect on the average times of crystallization. It is shown here that rhe...