ISOTHERMAL CRYSTALLIZATION: THERMAL AND OPTICAL STUDY OF PEG

IF 1.4 4区工程技术 Q4 POLYMER SCIENCE

Journal of Macromolecular Science Part B-Physics Pub Date : 2001-05-31 DOI:10.1081/MB-100106161

R. Berlanga, J. Suñol, J. Saurina, J. Oliveira

引用次数: 2

Abstract

In this work, the solidification process and the crystal growth kinetics of polyethylene glycol 4000 (PEG4000) and polyethylene glycol 6000 (PEG6000) (molecular average weight 4000 and 6000, respectively) were characterized by thermal optical microscopy (OM) and differential scanning calorimetry (DSC). The growth rate decreased with increasing crystallization temperature. The kinetic rate constant was lower for PEG6000 than for PEG4000 (29,300 and 32,900 K2, respectively). This behavior is related to the different number of folds (folding index n) of the crystal structures. From comparison of microscopy and calorimetry measurements, the kinetic rate constant values were higher by microscopy due to different melt histories, self-nucleation, and degree of entanglement.

查看原文本刊更多论文

等温结晶:聚乙二醇的热学和光学研究

本文采用热光学显微镜(OM)和差示扫描量热法(DSC)对分子量分别为4000和6000的聚乙二醇4000 (PEG4000)和聚乙二醇6000 (PEG6000)的凝固过程和晶体生长动力学进行了表征。随着结晶温度的升高，生长速率降低。PEG6000的动力学速率常数低于PEG4000(分别为29,300和32,900 K2)。这种行为与晶体结构的不同折叠数(折叠指数n)有关。从显微镜和量热测量的比较来看，由于不同的熔融历史、自核和纠缠程度，显微镜下的动力学速率常数值更高。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Journal of Macromolecular Science Part B-Physics 工程技术-高分子科学

CiteScore

2.50

自引率

21.40%

发文量

审稿时长

2.3 months

期刊介绍： Devoted to the publication of significant fundamental contributions to the physics of macromolecular solids and liquids, both synthetic and natural, this international journal publishes original research in all of the areas generally included in both polymer solid state and liquid physics. This authoritative journal contains papers reporting research in transition mechanisms and structure-property relationships, the physics of polymer solutions and melts, of glassy and rubbery amorphous solids, and the physics of individual polymer molecules.