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The long chain branching of polybutadienes (PB) was measured with gel permeation chroma-tography coupled to an automatically recording capillary viscometer. In this method the experimentalrelation [η] (V) was translated into the calibration curve [η] (V_R) for the monodisperse species. The curve is combined with the universal calibration so that the molecular weight distributionand an additional parameter, e.g. the average branching factor of this samples may be obtained. Longchain branching molecular weight changes with polyemerization conditions. 相似文献
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自动粘度计作为测定分子尺寸的手段与示差际光器联用于凝胶色谱检测器时,将大大扩大其应用范围,如测定粘度常数k、α与色谱柱分离和扩展同时校准,已成为测定聚合物长链支化的有力手段。联机的基本原理比较简单,如图1所示。 相似文献
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