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Effect of backbone and end-group regioisomerism on thermomechanical properties of vanillin-based polyurethane networks
Polymer Chemistry ( IF 4.6 ) Pub Date : 2020-12-29 , DOI: 10.1039/d0py01578d Adithya Rangamani 1, 2, 3, 4, 5 , Christopher A. Alabi 1, 2, 3, 4, 5
Polymer Chemistry ( IF 4.6 ) Pub Date : 2020-12-29 , DOI: 10.1039/d0py01578d Adithya Rangamani 1, 2, 3, 4, 5 , Christopher A. Alabi 1, 2, 3, 4, 5
Affiliation
Monomer composition, cross-link density, and cross-link distribution are the primary determinants of material properties in thermosetting networks. Here, we investigate the effect of regioisomerism and composition in polymeric networks via a recently developed scalable sequence-defined polyurethane macromer (SD-PUM) platform. The iterative, support-free SD-PUM platform facilitates the assembly of macromers with tunable backbones and pendant groups at the gram-scale. A series of SD-PUMs made with different end-groups and vanillin positional isomers were synthesized and cross-linked into thermosetting networks via multivalent thiol cross-linkers. The results show that the thermomechanical properties of the ensuing networks are sensitive to the choice of regioisomer embedded in the SD-PUM backbone as well as the type of macromer end-group. When a cross-linker with higher functionality is employed, regioisomeric differences result in more pronounced changes in material properties. This work showcases the robustness of the SD-PUM platform and its use of backbone and end-group regioisomers to modulate material properties.
中文翻译:
骨架和端基区域异构对香草醛基聚氨酯网络热机械性能的影响
单体组成,交联密度和交联分布是热固性网络中材料性能的主要决定因素。在这里,我们通过最近开发的可扩展序列定义的聚氨酯大分子单体(SD-PUM)平台,研究区域异构和组成在聚合物网络中的作用。迭代的,无需支持的SD-PUM平台有助于以克为单位组装具有可调主链和侧基的大分子单体。具有不同端基和香草醛的位置异构体作出了一系列SD-PUMS的合成和交联成热固性网络通过多价硫醇交联剂。结果表明,随后的网络的热力学性质对嵌入SD-PUM主链中的区域异构体的选择以及大分子单体端基的类型敏感。当使用具有较高官能度的交联剂时,区域异构体差异导致材料性能的更明显变化。这项工作展示了SD-PUM平台的鲁棒性,以及其使用骨架和端基区域异构体调节材料特性的能力。
更新日期:2021-01-08
中文翻译:
骨架和端基区域异构对香草醛基聚氨酯网络热机械性能的影响
单体组成,交联密度和交联分布是热固性网络中材料性能的主要决定因素。在这里,我们通过最近开发的可扩展序列定义的聚氨酯大分子单体(SD-PUM)平台,研究区域异构和组成在聚合物网络中的作用。迭代的,无需支持的SD-PUM平台有助于以克为单位组装具有可调主链和侧基的大分子单体。具有不同端基和香草醛的位置异构体作出了一系列SD-PUMS的合成和交联成热固性网络通过多价硫醇交联剂。结果表明,随后的网络的热力学性质对嵌入SD-PUM主链中的区域异构体的选择以及大分子单体端基的类型敏感。当使用具有较高官能度的交联剂时,区域异构体差异导致材料性能的更明显变化。这项工作展示了SD-PUM平台的鲁棒性,以及其使用骨架和端基区域异构体调节材料特性的能力。