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Comparison of thermal properties of ethylene‐norbornene copolymers prepared by batch and semi‐batch processes
Author(s) -
Liu Shaojie,
Yao Zhen,
Cao Kun
Publication year - 2009
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.29749
Subject(s) - norbornene , copolymer , ethylene , materials science , batch reactor , metallocene , polymer chemistry , chemical engineering , thermal , kinetics , catalysis , chemistry , polymerization , organic chemistry , thermodynamics , composite material , polymer , physics , quantum mechanics , engineering
Ethylene‐norbornene copolymers (ENCs) with various norbornene (NB) fractions could be synthesized by metallocene catalyst in both batch and semi‐batch processes. The batch process with long reaction time produced the ENC samples having considerable copolymer composition drift (CCD) while the semi‐batch process yielded narrow CCD. Furthermore, the effects of CCD on the resultant ENC's thermal properties were discussed. It was found that the thermal properties were dependent on both the NB fraction in obtained ENC and its CCD. The work demonstrated the importance of controlling CCD in the production of ENCs for superior materials properties. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009