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首页> 外文期刊>Journal of Applied Polymer Science >Role of blend phase ratio in controlling morphology, compressive, and recovery behavior of low-density polyethylene/ethylene-vinyl acetate foams
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Role of blend phase ratio in controlling morphology, compressive, and recovery behavior of low-density polyethylene/ethylene-vinyl acetate foams

机译：Role of blend phase ratio in controlling morphology, compressive, and recovery behavior of low-density polyethylene/ethylene-vinyl acetate foams

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摘要

This work presents a detailed study on the influence of blend phase ratio upon the morphology, crystallinity, mechanical and viscoelastic properties of cross-linked foams based on blends of low-density polyethylene (LDPE) and ethylene-vinyl acetate copolymer (EVA). Non-isothermal foaming is carried out via melt compression molding using dicumyl peroxide and azodicarbonamide as crosslinking and foaming agents, respectively. Rheo-mechanical spectrometer characterization reveals faster crosslinking for EVA, leading to higher rate of melt viscosity increase for EVA-rich blends during heating. This results in the formation of foams with higher cell density and gel content than LDPE-rich foams. Compressive stress-strain behavior and viscoelastic hysteresis of the LDPE-rich foams are governed by the degree of crystallinity and cell density, whereas for the EVA-rich foams cell density and gel content are dominant. Increasing the crosslink density results in enhanced compressive behavior with excellent recovery of stress to 60% strain during four compression cycles.

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