Unsaturated Poly(ester-urethanes) with Stereochemically Dependent Thermomechanical Properties,Macromolecules

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Unsaturated Poly(ester-urethanes) with Stereochemically Dependent Thermomechanical Properties
Macromolecules ( IF 5.1 ) Pub Date : 2019-12-23 , DOI: 10.1021/acs.macromol.9b01700
Connor J. Stubbs ₁ , Joshua C. Worch ₁ , Hannah Prydderch ₁ , Matthew L. Becker ₂ , Andrew P. Dove ₁

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Polymer crystallinity is known to be dependent upon backbone stereochemistry, and this concept has emerged as an effective means of altering bulk material properties. Herein we describe a simple, step-growth polymerization to synthesize unsaturated poly(ester-urethane)s using the thiol-Michael addition reaction. The absolute control of alkene stereochemistry (0–100% trans content) in the polymer backbone was achieved by varying the cis/trans double bond content of the monomer feedstock. In turn, the crystallinity of the polymer was systematically varied which manifested in control over the resultant tensile properties such as Young’s modulus, ultimate tensile strength, and elongation at break. Generally, the crystallinity and tensile strength were positively correlated with increasing trans double bond content within the polymer.

中文翻译：

具有立体化学依赖性的热机械性质的不饱和聚（酯-氨基甲酸酯）

已知聚合物的结晶度取决于主链立体化学，并且该概念已经出现，是改变本体材料性质的有效手段。在本文中，我们描述了一种简单的，逐步增长的聚合反应，以使用硫醇-迈克尔加成反应合成不饱和聚（酯-氨基甲酸酯）。通过改变单体原料的顺式/反式双键含量可以实现聚合物主链中烯烃立体化学的绝对控制（0-100％反式含量）。进而，聚合物的结晶度被系统地改变，这表现在对所得拉伸性能如杨氏模量，极限拉伸强度和断裂伸长率的控制中。通常，结晶度和拉伸强度与聚合物中反式双键含量的增加呈正相关。

更新日期：2019-12-25

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