Thermal, mechanical, and thermo-mechanical properties of thermosets produced using low Mw functionalized polyolefins and polyamines

• Published in: Journal of applied polymer science Vol. 125; no. 1; pp. 46 - 52
• Main Authors: Hameed, Tayyab, Potter, David K., Takacs, Elizabeth
• Format: Journal Article
• Language: English
• Published: Hoboken Wiley Subscription Services, Inc., A Wiley Company 05.07.2012; Wiley; Wiley Subscription Services, Inc
• Subjects: Applied sciences; Chemical reactions and properties; crosslinked products; Crosslinking, vulcanization; DMA; DSC; Exact sciences and technology; maleic anhydride-grafted polyolefin; Materials science; Organic polymers; Physicochemistry of polymers; polyether diamines; Polymers; tensile properties; Ethylene derivative copolymer; Molecular structure; Crosslink density; Telechelic polymer; Mechanical properties; Crosslinking; Tensile property; Organic anhydride; Crystallinity; Ethylene oxide copolymer; Experimental study; Functional polymer; maleic anhydride-grafted polyolefin; crosslinked products; Crosslinked copolymer; Thermal properties; polyether diamines; tensile properties; Cyclic ether copolymer; DSC; DMA; Propylene oxide copolymer; Property structure relationship
• ISSN: 0021-8995; 1097-4628
• DOI: 10.1002/app.35518

Thermosets obtained by reacting highly functionalized maleic anhydride‐grafted polyethylene and a polyetherdiamine at several NH2/MA molar ratios were characterized for their gel content, thermal, mechanical, and thermo‐mechanical behavior. Gel content varied with composition and a maximum (57%) observed when NH2/MA molar ratio was 1.5. Two melting transitions were observed for thermosets, representing the semicrystalline polyethylene fraction in the gel and sol part of the material in contrast to a single transition for the starting polyethylene. Overall crosslinking suppressed the crystallinity of the polyethylene in the thermoset. A single Tg observed in the DMA analysis suggested phase mixing between the polyethylene and polyether chains. A shift in the Tg observed was related to the degree of crosslinking in the thermosets. Tensile properties of the thermosets were observed to be a strong function of composition and the degree of crosslinking and the optimum mechanical performance was shown by thermosets when NH2/MA molar ratio was 1.5 and 2.0. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012