Effect of γ-dose rate on crystallinity and morphological changes of γ-sterilized biomedical polypropylene

被引：33

作者：

Alariqi, Sameh A. S. ^{[1
]}

Kumar, A. Pratheep ^{[2
]}

Rao, B. S. M. ^{[3
]}

Singh, R. P. ^{[2
]}

机构：

[1] Univ Taiz, Fac Sci, Dept Chem, Taizi, Yemen

[2] Natl Chem Lab, Div Polymer Sci & Engn, Pune 411008, Maharashtra, India

[3] Univ Pune, Dept Chem, Pune 411005, Maharashtra, India

来源：

POLYMER DEGRADATION AND STABILITY | 2009年 / 94卷 / 02期

关键词：

Polypropylene; Crystallinity; Morphology; Mechanical properties; Gamma radiation; Dose rate; MOLECULAR-WEIGHT POLYETHYLENE; RADIATION-RESISTANT POLYPROPYLENE; ISOTACTIC POLYPROPYLENE; ENVIRONMENTS; IRRADIATION; OXIDATION; POLYMERS; DEGRADATION; BEHAVIOR; FILM;

D O I：

10.1016/j.polymdegradstab.2008.10.027

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

The present work is aimed to study the changes in crystallinity and morphology of biomedical polyolefins after gamma-sterilization. The isotactic polypropylene (iPP) films were sterilized by gamma-radiation and the changes were characterized by differential scanning calorimetry (DSC), wide angle X-ray diffraction (WAXD) and atomic force microscopy (AFM) techniques. The effect of dose rate on crystallinity changes also was focused. It was found that crystallinity and morphology significantly changed with gamma-irradiation. There was an increase in crystallinity Lip to 10 kGy accompanied with decrease in viscosity and mechanical properties. The changes in crystallinity mainly depend on gamma-irradiation dose and dose rate. The rise in crystallinity was attributed to chain scission and forming new perfect lamellae. However, the reduction was accompanied by occurrence of gamma- and beta-phases and crosslinking. Possible explanations for transitions in phases are also discussed based on our results. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：272 / 277

页数：6

共 42 条

[1] Biodegradation of γ-sterilised biomedical polyolefins under composting and fungal culture environments [J].