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首页> 外文期刊>RSC Advances >Rapid synthesis and properties of segmented block copolymers based on monodisperse aromatic poly(N-methyl benzamide) and poly(propylene oxide)
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Rapid synthesis and properties of segmented block copolymers based on monodisperse aromatic poly(N-methyl benzamide) and poly(propylene oxide)

机译：单分散芳族聚（ N -甲基苯甲酰胺）和聚环氧丙烷的嵌段共聚物的快速合成与性能

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摘要

Monodisperse aromatic N-methyl benzamide-based molecules (repeat number: x = 5–10, molar mass distribution Mw/Mn = 1.02–1.04) connected with terephthalic acid at both sides (MABx–x) were rapidly prepared by a step-wise condensation reaction using the reported one-pot dendrimer synthetic method. These were copolymerized with NH2-terminated poly(propylene oxide) (PPOy) using a condensation reagent at ambient temperature, and the relationship between the structure and the properties was evaluated. The copolymers, poly(MABx–x-b-PPOy), had Mn values up to 12?500 g mol?1 (Mw/Mn = 1.6), with only a single Tg at ?70 °C by DSC, assignable to the pure PPO domain. Only for the copolymer films consisting of a monodisperse MABx–x segment, did the dynamic mechanical analysis (DMA) show two Tg values at ?70 and above 50 °C, indicating the clear phase segregation of the copolymers. The mechanical properties of the copolymer films were mostly dependent on the fraction of the monodisperse hard segment, and the tensile modulus and elongation at break varied from 3.3 to 32.5 MPa and 150 to 540%, respectively.
机译：单分散芳香族 N -甲基苯甲酰胺基分子（重复数： x = 5-10，摩尔质量分布 M w / M n = 1.02-1.04），两端均与对苯二甲酸（MAB x – x ）是通过已报道的一锅树枝状大分子合成方法通过逐步缩合反应快速制备的。它们与NH 2 端接的聚环氧丙烷（PPO y 共聚＞）在环境温度下使用缩合试剂，并评估结构与性能之间的关系。共聚物，聚（MAB x – x - b -PPO y ），其 M n 值最高为12 500 g摩尔 ？1 （ M w / M < / em> n = 1.6），只有一个 T g DSC约为70°C，可分配给纯PPO域。仅对由单分散MAB x – x 片段组成的共聚物薄膜进行动态力学分析（DMA ）显示出在<70> 70°C和50°C以上的两个 T g 值，表明共聚物的透明相偏析。共聚物薄膜的机械性能主要取决于单分散硬链段的分数，拉伸模量和断裂伸长率分别从3.3％至32.5 MPa和150％至540％不等。

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