THE TOUGHENING OF POLYAMIDE-6 BY BROMINATED POLY(ISOBUTYLENE-CO-P-METHYLSTYRENE) - FRACTURE AND TOUGHENING MECHANISMS

POLYMER

卷:34

Article

LI, DM ; YEE, AF ; POWERS, KW ; WANG, HC ; YU, TC

关键词: TOUGHENING;    IMPACT FRACTURE;    CAVITATION;   

DOI  :  10.1016/0032-3861(93)90153-2

来源: Elsevier

【 摘 要 】

A study on the toughening of polyamide-6 (PA-6) with a new elastomeric modifier, brominated poly(isobutylene-co-p-methylstyrene) (BrXP-50), was conducted. Morphological analyses and mechanical tests were combined to evaluate the toughening mechanisms of modified PA-6 and the fracture mechanism of unmodified PA-6. We conclude that the fracture mechanism of unmodified PA-6 in the impact test is crazing-cracking under the dilatational stress created by the plastic constraint, while that of the BrXP-50 elastomer modified PA-6 is plastic tearing limited by the ultimate tensile strain. Cavitation of BrXP-50 elastomer particles occurred in the impact test, and is proposed as a controlling step in toughening: it relieves the plastic constraint so that the cracking process is postponed and additional plastic deformation can occur, leading to higher impact toughness.

【 授权许可】

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