Morphology and Thermal Properties of Precision Polymers: The Crystallization of Butyl Branched Polyethylene and Polyphosphoesters
Morphology and Thermal Properties of Precision Polymers: The Crystallization of Butyl Branched Polyethylene and Polyphosphoesters
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DOI：
10.1021/acs.macromol.5b02581
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发表时间：
2016-02
期刊：
影响因子：
5.5
通讯作者：
Yijun Zheng;Hisachi Tien Tee;Yu-Fu Wei;X. Wu;M. Mezger;Shouke Yan;K. Landfester;K. Wagener
中科院分区：
文献类型：
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作者：
Yijun Zheng;Hisachi Tien Tee;Yu-Fu Wei;X. Wu;M. Mezger;Shouke Yan;K. Landfester;K. Wagener
化学不规则性，如侧链分支或共聚单体，在其他规则的聚合物影响其结晶。在大多数聚合物体系中，这些化学缺陷沿链随机分布，很难详细了解它们对结晶的影响。研究了三种由无环二烯复分解（ADMET）聚合制备的精密聚合物。这种合成确保了链缺陷的精确位置；这里它们都被20个CH2单位隔开。该聚合物是两个主链上有一个磷酸或膦酸基团的聚磷酸酯和一个有丁基分支的聚乙烯。虽然这三种聚合物的烷基部分是相同的，但它们的热性能和晶体性能却有明显的不同。通过差示扫描量热法、x射线散射和透射电子显微镜，我们对片层晶体进行了表征，并将我们的发现与观察到的热行为差异联系起来。
Chemical irregularities such as side chain branches or comonomers in an otherwise regular polymer influence its crystallization. In most polymer systems, these chemical defects are randomly distributed along the chain, and it is difficult to understand in detail their effect on crystallization. We have examined three precision polymers prepared by acyclic diene metathesis (ADMET) polymerization. This synthesis ensures exact placement of the chain defects; here they are all separated by 20 CH2 units. The polymers are two polyphosphoesters with a phosphate or phosphonate group in the main chain and one polyethylene with butyl branches. Although the alkyl part is identical for all three polymers, their thermal and crystal properties differ noticeably. By means of differential scanning calorimetry, X-ray scattering, and transmission electron microscopy, we characterize the lamellar crystals and correlate our findings to the observed difference in thermal behavior.