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AGING CHARACTERISTICS OF TERNARY BLENDS OF POLYETHYLENES. I
Degradation of a low-density polyethylene (LDPE)/linear low-density polyethylene (LLDPE)/high-density polyethylene (HDPE) blend having different weight ratios of LLDPE (10-35 wt%) and HDPE (40-65 wt%) with fixed percentage of LDPE (25 wt%) was studied by aging the film samples at 55, 70, 85, and 100...
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Published in: | Materials and manufacturing processes 2001-06, Vol.16 (3), p.419-425 |
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Main Authors: | , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | Degradation of a low-density polyethylene (LDPE)/linear low-density polyethylene (LLDPE)/high-density polyethylene (HDPE) blend having different weight ratios of LLDPE (10-35 wt%) and HDPE (40-65 wt%) with fixed percentage of LDPE (25 wt%) was studied by aging the film samples at 55, 70, 85, and 100°C in air. Reactions involved in changing the molecular structure and formation of oxygenated and unsaturated groups during thermo-oxidative degradation are discussed. The molecular weight (M
v
) showed very little change in the initial hours of aging at different temperatures. Tensile strength was found to increase initially and then decrease with aging time. The increase in tensile strength suggests molecular enlargement, mainly by recombination of alkyl and alkoxy radicals, which produces nonradical products. The thermal stability decreases with increase in aging time and temperature. |
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ISSN: | 1042-6914 1532-2475 |
DOI: | 10.1081/AMP-100107384 |