Back SearchTitle: EFFECT OF PROCESSING PARAMETERS ON CELLULAR STRUCTURES AND MECHANICAL PROPERTIES OF PMMA MICROCELLULAR FOAMS
Page Range: p.177-195
Author(s): Jin Fu; Choonghee Jo; Naguib H E
File size: 220K
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Issue Year: cp
Volume: 24
Issue No: No. 4
Abstract
Microcellular, closed-cell PMMA foams were produced by a two-stage batch process under different foaming temperatures, foaming times and saturation pressures. The effects of processing parameters on the mechanical properties of the foams were investigated by tensile testing and the relationship between processing, mechanical properties and morphology of the foams examined. The experimental findings were compared with current analytical approaches and a constitutive equation based on the Maxwell viscoelastic model developed to describe the non-linear elastic behaviour of the foams. 28 refs.
Title: STUDY ON THE AGING RULES OF RIGID POLYURETHANE FOAMS AT INDOOR STORAGE AND DIFFERENT HYGROTHERMAL CONDITIONS
Page Range: p.197-208
Author(s): Yuan-Jun Liu; Wen Zhai; Chuan-Lan He; Jian-Guo Deng; Ke-Jian Ji; Yin-Sheng Zhang; Si-Xiu Sun
File size: 174K
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Issue Year: cp
Volume: 24
Issue No: No. 4
Abstract
Rigid PU foams were stored indoors and hygrothermally aged at 90% relative humidity and at 60C and variations in weight, dimensional stability and compression properties of the aged foams investigated. The effects of glass beads and phosphorus-based flame retardant on the ageing and compression properties of the foams were examined and the mechanism of degradation considered. 12 refs.
Title: COMPRESSIVE DEFORMATION AND ENERGY ABSORPTION CHARACTERISTICS OF CONDUCTIVE CARBON BLACK REINFORCED MICROCELLULAR EPDM VULCANIZATES
Page Range: p.209-222
Author(s): Mahapatra S P; Tripathy D K
File size: 166K
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Issue Year: cp
Volume: 24
Issue No: No. 4
Abstract
An investigation was carried out into the compressive stress-strain properties and energy absorption characteristics of unfilled and conductive carbon black-filled, oil-extended EPDM microcellular vulcanisates. The effects of filler and blowing agent loadings on compression properties were examined and the effect of strain rate on compressive stress-strain properties evaluated. 21 refs.
Title: MICROCELLULAR FOAMS PREPARED BY EXPOSING (CO2 + H2O) LADEN POLYMERS TO MICROWAVES
Page Range: p.223-227
Author(s): Zhiyi Zhang; Shiying Lu; Nawaby A V; Handa Y P
File size: 217K
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Issue Year: cp
Volume: 24
Issue No: No. 4
Abstract
A novel method for the preparation of foams having cells less than 10 micrometers, which involves incorporating water into the polymer matrix using carbon dioxide as carrier followed by excitation with microwaves, is described. Application of the method to the foaming of PMMA, polycarbonate, polyamide-6, PS and isotactic polypropylene is demonstrated. 6 refs.