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Effect of Chain Microstructure and Cooling Rate on Crystaf Calibration Curves: An Experimental Study
Author(s) -
Somnukguande Punnawit,
Anantawaraskul Siripon,
Soares João B.P.
Publication year - 2012
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.201100002
Subject(s) - comonomer , crystallization , calibration curve , isothermal process , materials science , calibration , microstructure , analytical chemistry (journal) , polymer , molar mass distribution , copolymer , fractionation , thermodynamics , chromatography , chemistry , composite material , physics , quantum mechanics , detection limit
Summary: Crystallization analysis fractionation (Crystaf) is a polymer characterization technique based on differences in chain crystallizabilities in a dilute solution during non‐isothermal crystallization. Crystaf profiles, a weight distribution function of chains crystallized at each temperature, can be used to infer the chemical composition distribution (CCD) of copolymers when a Crystaf calibration curve, a relationship between peak crystallization temperature and average comonomer content, is known. In this investigation, the effect of the number average molecular weight, comonomer type, and cooling rate on Crystaf calibration curves were experimentally investigated. It was found that the cooling rate and comonomer type may strongly affect Crystaf calibration curves, while the influence of molecular weight is relatively subtle.