Chain Stiffness and Chain Conformation of Poly(α-methylene-γ-butyrolactone) in Dilute Solutions
Chain Stiffness and Chain Conformation of Poly(α-methylene-γ-butyrolactone) in Dilute Solutions
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聚(α-亚甲基-γ-丁内酯)在稀溶液中的链刚度和链构象
DOI：
10.1016/j.polymer.2014.10.026
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发表时间：
2014
期刊：
影响因子：
4.6
通讯作者：
Atsushi Takahara
中科院分区：
文献类型：
--
作者：
Yuji Higaki;Ryosuke Okazaki;Tatsuya Ishikawa;Moriya Kikuchi;Noboru Ohta;Atsushi Takahara
无规聚的链刚性和局部链构象（α-亚甲基-γ-丁内酯）（PMBL）是一种侧链环状结构类似物，（甲基丙烯酸甲酯）（PMMA），重均分子量（Mw）为2.8 × 103 - 2.6 × 106 inN，采用体积排阻色谱-多角度光散射检测器对N-二甲基甲酰胺（DMF）和γ-丁内酯（GBL）进行了表征（SEC-MALS）和同步辐射小角X射线散射（SAXS）。基于Kratky-Porod蠕虫链模型，散射函数和z-平均均方根回转半径<S2>z1/2的Mw依赖性产生Kuhn链段长度λ−1，PMBL链的直径sd，以及DMF和GBL中的排斥体积强度。无规PMBL在DMF和GBL中的局部构象略大于无规PMMA，这是由于存在构象刚性的内酯环结构。
The chain stiffness and local chain conformation of atactic poly(α-methylene-γ-butyrolactone) (PMBL), which is a side chain cyclic structural analog of poly(methyl methacrylate) (PMMA), with a weight-average molecular weight (Mw) ranging from 2.8 × 103to 2.6 × 106inN,N-dimethylformamide (DMF) and γ-butyrolactone (GBL) were characterized by size exclusion chromatography with a multi-angle light-scattering detector (SEC-MALS) and synchrotron radiation small-angle X-ray scattering (SAXS). Based on the Kratky-Porod worm-like chain model, the scattering functions and theMwdependence of z-average root-mean-square radius of gyration <S2>z1/2yielded the Kuhn segment lengthsλ−1, the diameter of the PMBL chainsd, and the excluded-volume strengths in DMF and GBL. The local conformation of atactic PMBL in DMF and GBL were slightly larger than those of atactic PMMA, due to the presence of the conformationally rigid lactone ring structure.