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A new method for rapid evaluation of long‐chain branching in polymers
Author(s) -
Chunshan Jin,
Qipeng Guo
Publication year - 1990
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.1990.070410938
Subject(s) - branching (polymer chemistry) , polybutadiene , polymer , polyethylene , long chain , intrinsic viscosity , materials science , chain (unit) , polymer chemistry , polymer science , analytical chemistry (journal) , chemistry , chromatography , composite material , copolymer , physics , astronomy
A new method for rapid evaluation of long‐chain branching (LCB) in polymers was developed. The crude GPC chromatogram and the measured value of intrinsic viscosity of the whole polymer are the only data required. By using trial and error in combination with graphic analysis, the threshold value M 0 and average molecular weights M̄ w and M̄ n , as well as LCB can be simultaneously evaluated. The advantage of this method lies in avoiding predetermination of the M 0 for a given resin. The results obtained by this method for NBS Branched Polyethylene Standard Reference Material SRM 1476 and for a branched cis ‐1,4‐polybutadiene sample were in good agreement with those given by the conventional Ram–Miltz method.