Thermal and mechanical properties of silane-crosslinked poly(vinylchloride)

• Published in: Journal of applied polymer science 1998-10, Vol.70 (5), p.865-872
• Main Authors: Hidalgo, M., Beltrán, M. I., Reinecke, H., Mijangos, C.
• Format: Article
• Language: English
• Subjects: Applied sciences; Chemical reactions and properties; crosslinked poly(vinylchloride); Crosslinking, vulcanization; Exact sciences and technology; gel content; mechanical and thermal properties; Organic polymers; organosilanes grafting; Physicochemistry of polymers; reactive processing
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/(SICI)1097-4628(19981031)70:5<865::AID-APP5>3.0.CO;2-R

A comparative study has been made of the crosslinking of plasticized PVC by grafting of γ‐aminopropyltriethoxysilane (ASi) and sodium γ‐mercaptopropyltrimethoxysilane (NaMSi) during processing. The influence of type of reagent and concentration, and the rheological behavior were investigated to obtain a crosslinked material with improved mechanical properties and good thermal stability. Depending on the reagent concentration, different gel contents, ranging from 0–100%, were obtained with both reagents. For all crosslinked systems the mechanical properties above Tg were improved. In the case of ASi‐crosslinked PVC, the thermal stability deteriorated significantly but, for NaMSi‐crosslinked PVC, thermal stability remains close to that of raw PVC, and the separation of the grafting and crosslinking processes is more viable in this case. © 1998 John Wiley & Sons, Inc. J. Appl. Polym. Sci. 70: 865–872, 1998