Long chain branching in low density polyethylene: 1. Molecular structure
β Scribed by Giuseppe Gianotti; Aldo Cicuta; Daniele Romanini
- Publisher
- Elsevier Science
- Year
- 1980
- Tongue
- English
- Weight
- 421 KB
- Volume
- 21
- Category
- Article
- ISSN
- 0032-3861
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π SIMILAR VOLUMES
13C-NMR spectroscopy and size exclusion chromatography have been used to determine the mean length of long branches in a number of high pressure process low density polyethylenes (LDPEs). 13C-NMR analyses count all branches longer than C5 as "long." The polyethylenes studied all had 2-3 long branche
## Abstract In the present study a population balance approach is described to follow the time evolution of bivariate molecular weightβlong chain branching (MWβLCB) distributions in high pressure low density polyethylene autoclaves. The model formulation is based on a sectional grid method, the soβ
An experimental study of extrudate swell has been carried out, involving five low-density polyethylene (LDPE) samples of approximately the same molecular size but of different frequencies of long-chain branching (LCB). The results show that the samples with higher frequencies of LCB exhibit a tenden