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Effect of the fold surface of the lamellae on the behavior of the trapped radicals in irradiated Polyamide‐1010
Author(s) -
Yu Jiayan,
Li Baozhong,
Zhang Lihua
Publication year - 1998
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(19980214)67:7<1335::aid-app24>3.0.co;2-z
Subject(s) - radical , crystallite , polyamide , amorphous solid , oxide , materials science , fold (higher order function) , irradiation , macromolecule , polymer chemistry , crystallography , chemistry , organic chemistry , mechanical engineering , physics , nuclear physics , engineering , metallurgy , biochemistry
Two types of macromolecular free radicals —CH 2 CONHĊHCH 2 — ( a ) and —CH 2 Ċ=O ( b ) trapped in irradiated Polyamide‐1010 (PA1010) and PA1010 filled with neodymium oxide (Nd 2 O 3 ) were characterized by an ESR approach. It was found out that a was mainly trapped in the fold surface of the lamellae and b in the amorphous phase. This result suggested that trapped radicals mainly existed in the noncrystalline phases. The effect of the fold surface area of the lamellae on the behavior of the trapped radicals are discussed in this article. Whether for the specimens with similar crystallinities but different crystallite sizes or for those with the same concentration of neodymium oxide but different crystallinities, radical a exists dominantly in a specimen with a larger fold surface area of the lamellae. Under a certain circumstance, radical a can transform into radical b for a specimen with a larger fold surface area of the lamellae. It means that the fold surface area of the lamellae plays an important role in the transformation of radical a to b . © 1998 John Wiley & Sons, Inc. J Appl Polym Sci 67:1335–1339, 1998