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首页> 外文期刊>Journal of Applied Polymer Science >Feather-like morphology of poly(methyl methacrylate)/poly(ethylene oxide) blends: The effect of cooling rate and poly(methyl methacrylate) content
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Feather-like morphology of poly(methyl methacrylate)/poly(ethylene oxide) blends: The effect of cooling rate and poly(methyl methacrylate) content

机译：聚（甲基丙烯酸甲酯）/聚（环氧乙烷）混合物的羽毛状形态：冷却速率和聚（甲基丙烯酸甲酯）含量的影响

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摘要

The effect of cooling rate on the crystallization morphology and growth rate of poly(ethylene oxide) (PEO) and PEO/poly(methyl methacrylate) (PMMA) blends has been observed by Hot Stage Polarized Microscopy (HS-POM). The isothermal crystallization kinetics study was carried out by differential scanning calorimetry (DSC). The spherulite morphology has been observed for the neat PEO with molecular weight of 6000 g/mol. By adding of PMMA with molecular weight of 39,300 g/mol, the growth fronts become irregular. With the increasing of PMMA content, the irregularity of growth front becomes more obvious, and the feather-like morphology can be observed. When PMMA content is 60%, the spherulite is seriously destroyed. This phenomenon is more obvious for the slow cooling process. Based on the measurement of spherulite, the growth rate curves were obtained. According to the curves, it can be seen that the growth rate decreases with the increasing of PMMA content, and the growth rate during the slow cooling process is higher than that of the fast cooling process. The isothermal crystallization experiment indicates that the crystallization rate decreases dramatically with the increasing of PMMA content. And the Avrami parameter n was obtained, which is non-integral and less than 3. Finally, it can be concluded that the higher value of n can be obtained for the condition with low crystallization rate. (c) 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41705.
机译：热阶段偏振显微镜（HS-POM）观察到冷却速率对聚环氧乙烷（PEO）和PEO /聚甲基丙烯酸甲酯（PMMA）共混物的结晶形态和生长速率的影响。通过差示扫描量热法（DSC）进行了等温结晶动力学研究。已经观察到分子量为6000 g / mol的纯PEO的球晶形态。通过添加分子量为39,300 g / mol的PMMA，生长前沿变得不规则。随着PMMA含量的增加，生长前沿的不规则性变得更加明显，并且可以观察到羽毛状的形态。当PMMA含量为60％时，球晶被严重破坏。对于缓慢的冷却过程，这种现象更加明显。根据球晶的测量，获得了生长速率曲线。由曲线可知，随着PMMA含量的增加，其生长速率降低，慢速冷却过程中的生长速率高于快速冷却过程中的生长速率。等温结晶实验表明，随着PMMA含量的增加，结晶速率急剧下降。并且获得了Avrami参数n，该参数非整数且小于3。最后，可以得出结论，对于低结晶速率的条件，可以获得较高的n值。 （c）2014 Wiley Periodicals，Inc. J. Appl。 Polym。科学2015，132，41705。

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