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Understanding structure–property relationships of main chain cyclopropane in linear polyesters
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-08-28 , DOI: 10.1039/d0py01004a Connor J. Stubbs 1, 2, 3, 4 , Andrew P. Dove 1, 2, 3, 4
Polymer Chemistry ( IF 4.1 ) Pub Date : 2020-08-28 , DOI: 10.1039/d0py01004a Connor J. Stubbs 1, 2, 3, 4 , Andrew P. Dove 1, 2, 3, 4
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Rigid ring structures have gained increasing interest in the polymer materials community as an effective means to manipulate bulk properties. Despite this, little work has focussed on the smallest ring: cyclopropane. Herein, we report a polymerisation that enables incorporation of stereopure cis and trans 1,2-cyclopropanedimethanol through the thiol-Michael “click” reaction between dithiol and diacrylate monomers. Polyesters containing a cyclopropane backbone were found to be amorphous, whilst comparable polymers with a 1,4-butanediol backbone were semi-crystalline. By copolymerising cyclopropane monomers at varying ratios with 1,4-butanediol monomers, the crystalinity of the resulting polymer could be effectively tuned. Successfully adjusting the resulting crystallinity resulted in control over the ultimate tensile strength (UTS) and the Young's modulus (E) of the material. Generally, it was found that increasing cyclopropane content led to a decreased UTS and E as a result of lower polymer crystalinity. Effects of cyclopropane stereochemistry on thermomechanical properties were found to be minimal at low cyclopropane backbone ratios.
中文翻译：
了解线性聚酯中主链环丙烷的结构-性质关系
刚性环结构作为一种控制本体性能的有效手段，在聚合物材料界越来越受到关注。尽管如此，很少有工作集中在最小的环上：环丙烷。在本文中，我们报道了一种聚合反应，该聚合反应可以使立体纯的顺式和反式结合1,2-环丙二甲醇通过二硫醇和二丙烯酸酯单体之间的硫醇-迈克尔“点击”反应。发现含有环丙烷主链的聚酯是无定形的，而具有1，4-丁二醇主链的可比较的聚合物是半结晶的。通过以不同比例使环丙烷单体与1，4-丁二醇单体共聚，可以有效地调节所得聚合物的结晶度。成功地调节所得的结晶度导致对材料的极限拉伸强度（UTS）和杨氏模量（E）的控制。通常，发现增加环丙烷含量会导致UTS和E降低由于较低的聚合物结晶度。发现在低环丙烷主链比例下，环丙烷立体化学对热机械性能的影响最小。
更新日期：2020-10-13
中文翻译：
了解线性聚酯中主链环丙烷的结构-性质关系
刚性环结构作为一种控制本体性能的有效手段，在聚合物材料界越来越受到关注。尽管如此，很少有工作集中在最小的环上：环丙烷。在本文中，我们报道了一种聚合反应，该聚合反应可以使立体纯的顺式和反式结合1,2-环丙二甲醇通过二硫醇和二丙烯酸酯单体之间的硫醇-迈克尔“点击”反应。发现含有环丙烷主链的聚酯是无定形的，而具有1，4-丁二醇主链的可比较的聚合物是半结晶的。通过以不同比例使环丙烷单体与1，4-丁二醇单体共聚，可以有效地调节所得聚合物的结晶度。成功地调节所得的结晶度导致对材料的极限拉伸强度（UTS）和杨氏模量（E）的控制。通常，发现增加环丙烷含量会导致UTS和E降低由于较低的聚合物结晶度。发现在低环丙烷主链比例下，环丙烷立体化学对热机械性能的影响最小。
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