Affiliation:
1. College of Chemical Engineering and Materials Science Tianjin University of Science and Technology Tianjin 300457 China
2. State Key Laboratory of Polymer Physics and Chemistry Changchun Institute of Applied Chemistry Chinese Academy of Sciences Changchun 130022 China
Abstract
AbstractTREF (temperature rising elution fractionation) is a method to separate resins based on crystallizability. The influence of TREF cooling rate (V0) on the fractionation process is still unclear. Herein, a poly(1‐butene‐co‐ethylene) resin is fractionated by the TREF method at three different cooling rates (1, 2, and 4 °C h−1), and then the fractions are analyzed by high‐temperature gel permeation chromatography (HT‐GPC), differential scanning calorimetry (DSC), and 13C‐nuclear magnetic resonance spectroscopy (13C‐NMR). The cooling rate V0 affects the crystallization process of the PB‐1 resin, resulting in different fraction contents at the same elution temperature. Furthermore, the cooling rate also affects the chain microstructure of fractions obtained from the same elution temperatures, i.e., the content of 1‐butene and ethylene monomer units, average sequence length and isotacticity. The lower cooling rate is beneficial to the effective separation of the fractions with weak crystallizability. These results have important guidance for optimizing fractionation conditions and obtaining different narrow distribution fractions of poly(1‐butene) (PB‐1) resin.
Funder
National Natural Science Foundation of China
Subject
Materials Chemistry,Organic Chemistry,Polymers and Plastics,Physical and Theoretical Chemistry,Condensed Matter Physics