三种典型半芳香族聚酯的单分子力谱  

Single-molecule Force Spectra of Three Typical Semi-aromatic Polyesters

作　　者：万鹏程 陆松 鲍雨[1] 崔树勋[1] WAN Pengcheng;LU Song;BAO Yu;CUI Shuxun(School of Chemistry,Key Lab of Advanced Technologies of Materials,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)

机构地区：[1]西南交通大学化学学院,材料先进技术教育部重点实验室,成都610031

出　　处：《高等学校化学学报》2023年第8期175-181,共7页Chemical Journal of Chinese Universities

基　　金：国家自然科学基金(批准号:22273079);四川省自然科学基金(批准号:2022NSFSC1204);四川省中央政府引导地方科技发展计划项目(批准号:2022ZYD0043)资助.

摘　　要：以聚对苯二甲酸乙二醇酯、聚对苯二甲酸丙二醇酯和聚对苯二甲酸丁二醇酯为研究对象,利用单分子力谱技术研究了3种典型半芳香族聚酯在壬烷和去离子水环境中的单链力学性质.这3种聚酯在相同液体环境中的单链弹性曲线重合,表明亚甲基数量的微小差异对聚酯的本征弹性及亲/疏水性没有显著影响.这可能是因为聚酯分子结构非常相似,在溶液中均以无规链构象存在,故表现出相同的单链弹性.而聚酯宏观材料理化性质的差异可能是因为当分子链聚集形成晶体时,链段的排列组合方式以及分子间作用力发生了变化.单分子力谱研究有望为聚酯的性能调控提供一定的理论支持.The single-chain mechanical properties of three typical semi-aromatic polyesters(polyethylene terephthalate,polytrimethylene terephthalate,and polybutylene terephthalate)were studied by single-molecule force spectros⁃copy.The single-chain force-extension curves of these three polyesters obtained in the same liquid environment can be overlapped well,indicating that the small difference in the number of methylene has no significant effect on the inherent elasticity and hydrophilicity of polyesters.This may be because the polyester molecules are very similar in structure and all adopt the random chain conformation in solution.The single-molecule results imply that the differences in physicochemical properties of polyester materials may be due to the changes in the arrangement of chain segments and intermolecular forces when the polymer chains aggregate to form crystals.It is expected this study will provide some theoretical support for the property regulation of polyesters.

关 键 词：聚对苯二甲酸乙二醇酯 聚对苯二甲酸丙二醇酯 聚对苯二甲酸丁二醇酯 亚甲基 单分子力谱 

分 类 号：O631.2[理学—高分子化学]