Influence of Phase Ratio Upon Cellular Structure and Compressive Stress-Strain Behavior of Crosslinked LDPE/EVA Foams

  • سال انتشار: 1400
  • محل انتشار: هفدهمین کنگره ملی مهندسی شیمی ایران
  • کد COI اختصاصی: NICEC17_315
  • زبان مقاله: انگلیسی
  • تعداد مشاهده: 312
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نویسندگان

p katbab

Polymer Engineering Group, Kish International Campus, University of Tehran, Iran

s.h jafari

School of Chemical Engineering, College of Engineering, University of Tehran, Iran

a.a katbab

Department of Polymer and Color Engineering, Amirkabir University of Technology, Iran

چکیده

In the present work, the influence of phase ratio upon cellular strucutre and compression behavior of crosslinked foams based on blend of low-density polyethylene (LDPE) and ethylene-vinyl acetate copolymer (EVA) have been studied. For this purpose, blend compounds with phase ratios (۹۰/۱۰, ۷۰/۳۰ and ۵۰/۵۰) from LD-rich and EVA-rich containing dicumyl peroxide (DCP) and azodicarbonamide (ADC) as crosslinking and foaming agent respectively prepared via melt mixing, and thereafter foaming was conducted in one-step compression molding. EVA-rich foams revealed higher gel content and cell density in compared to LD-rich counterparts due to the higher crosslinking effeciency of EVA than LDPE. As per scanning-electron-microscopy (SEM) analysis, EVA-rich foams (phase ratio ۹۰/۱۰) demonstrated much higher cell density and lower cell diameter compared with similar LD-rich foam. Compressive stress-strain test exhibited lower mechanical hysteresis for LD-rich foams increasing EVA level, as a result of more rubbery-effect of EVA on the cell walls and also decrease in LDPE crystallinity. This led to the increase of strain recovery behavior of LD-rich foams with EVA content.

کلیدواژه ها

Foams, phase Ratio, Compressive, Crosslinked, Cellular Structure, LDPE, EVA

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