Thermal Field-Flow Fractionation for Characterization of Architecture in Hyperbranched Aromatic-Aliphatic Polyesters with Controlled Branching
Thermal Field-Flow Fractionation for Characterization of Architecture in Hyperbranched Aromatic-Aliphatic Polyesters with Controlled Branching
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DOI：
10.1021/acs.analchem.9b02664
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发表时间：
2019-10-01
影响因子：
7.4
通讯作者：
Williams, S. Kim Ratanathanawongs
中科院分区：
文献类型：
--
作者：
Smith, William C.;Geisler, Martin;Williams, S. Kim Ratanathanawongs
采用热场流分馏法（ThFFF）表征了不同支化程度的芳烃-脂肪族聚酯的结构。热扩散系数和Soret系数（分别为D-T和S-T）为聚合物结构分析提供了一种新的途径。本文展示了一种创新的策略，从嵌入在ThFFF保留时间中的物理化学分离参数中提取结构信息，而无需明确分离线性和分支样本。Soret收缩因子（g”），定义为支化聚合物的S-T与分子量等效线性类似物的S-T之比，作为表示支化程度（DB）的度量。这种方法规避了与分析具有高度分支的高摩尔质量聚合物相关的几个挑战。g”值与线性（DB, 0%）、逐渐分支（DB, 0%）的分支程度成正比。
Thermal field-flow fractionation (ThFFF) was used to characterize the architecture of aromatic-aliphatic polyesters with varying degrees of branching. Thermal diffusion and Soret coefficients (D-T and S-T, respectively) provide a novel route to polymer architecture analysis. This paper demonstrates an innovative strategy to extract architecture information from the physicochemical separation parameters embedded in ThFFF retention times without explicit separation of linear and branched samples. A Soret contraction factor (g ''), defined as the ratio of the S-T of a branched polymer to the S-T of a molecular weight equivalent linear analogue, is introduced as a metric to indicate degree of branching (DB). This approach circumvents several challenges associated with the analysis of high molar mass polymers with a high degree of branching. The g '' value is shown to be proportional to the degree of branching for linear (DB, 0%), gradually branched (DB,