期刊
POLYMER DEGRADATION AND STABILITY
卷 104, 期 -, 页码 1-10出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.polymdegradstab.2014.03.016
关键词
Polypropylene; Long chain branching; Crosslinking; UV radiation; Photoinitiator; Rheology
资金
- Natural Sciences and Engineering Research Council (NSERC) of Canada
- Canada Research Chair (CRC) program
A technique has been developed to modify the melt properties of polypropylene (PP). Photoinitiators along with UV irradiation were employed to introduce long chain branching (LCB) and/or crosslinking (CL). Statistically designed experiments were carried out to study the effect of processing conditions, such as photoinitiator concentration, duration of irradiation, UV lamp intensity, cooling air pressure, and photoinitiator type, on rheological properties, molecular weight characteristics and branching level. Samples were evaluated through linear viscoelastic (LVE) measurements, extensional rheometry, gel content, gel permeation chromatography (GPC), and differential scanning calorimetry (DSC). Results clearly indicated that PP can be successfully modified in order to enhance strain hardening behaviour without significant gel formation. (C) 2014 Elsevier Ltd. All rights reserved.
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