Silane Crosslinked Polyethylene from Different Commercial PE's: Influence of Comonomer, Catalyst Type and Evaluation of HLPB as Crosslinking Coagent

In the present work, the synthetic route to obtain crosslinked polyethylene (PEX) was studied using vinyltrimethoxy silane (VTMS) as crosslink agent and commercial polyethylene (HDPE and LLDPE). Materials were processed with increasing amounts of VTMS (2.5, 5.0 and 7.5 wt.%). After insertion of sila...

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Bibliographic Details
Published in:Materials research (São Carlos, São Paulo, Brazil) São Paulo, Brazil), 2015-04, Vol.18 (2), p.313-319
Main Authors: de Melo, Renato Pereira, de Oliveira Aguiar, Vinicius, Marques, Maria de Fatima Vieira
Format: Article
Language:eng ; por ; spa
Subjects:
Cross-linked polyethylene
Crosslinking
Differential scanning calorimetry
ENGINEERING, CHEMICAL
Insertion
MATERIALS SCIENCE, MULTIDISCIPLINARY
Mechanical properties
METALLURGY & METALLURGICAL ENGINEERING
Polyethylenes
Silanes
Thermal properties
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Summary:In the present work, the synthetic route to obtain crosslinked polyethylene (PEX) was studied using vinyltrimethoxy silane (VTMS) as crosslink agent and commercial polyethylene (HDPE and LLDPE). Materials were processed with increasing amounts of VTMS (2.5, 5.0 and 7.5 wt.%). After insertion of silane onto polymer chain in solid state, samples were molded by compression. Gel content was used to measure the extension of crosslinking. Melting temperature and degree of crystallinity were evaluated using differential scanning calorimetry (DSC). The microstructure of the starting polyethylene was correlated with the effectiveness of crosslinking and the resultant thermal and mechanical properties of the PEX. Hydroxylated liquid polybutadiene (HLPB) was employed to improve crosslink efficiency, as well as mechanical properties of the material.
ISSN:1516-1439
1980-5373
1980-5373
DOI:10.1590/1516-1439.303214