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High molecular weight tail and long‐chain branching in SRM 1476 polyethylene
Author(s) -
Beer F.,
Capaccio G.,
Rose L. J.
Publication year - 1999
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/(sici)1097-4628(19990929)73:14<2807::aid-app3>3.0.co;2-e
Subject(s) - branching (polymer chemistry) , polyethylene , long chain , chain (unit) , materials science , polymer chemistry , chemistry , polymer science , composite material , physics , astronomy
The composition of the high molecular weight tail in the branched polyethylene standard reference material SRM 1476 was studied in detail using size exclusion chromatography coupled with a refractive index, a viscosity, and a light scattering on‐line detector. The light scattering determinations of both molecular weight and radius of gyration point at a difference in kind between the molecular species below and above 10 6 Da. In particular, above 10 6 Da, increases in molecular weight resulted in a marked “densification” process. This is consistent with a greater concentration of long‐chain branching and/or with a change in molecular architecture. Previous literature results for this polymer and a critical comparison of the performance of the different detectors are also discussed. © 1999 John Wiley & Sons, Inc. J Appl Polym Sci 73: 2807–2812, 1999