Back SearchTitle: FOAMING CYCLO-OLEFIN COPOLYMERS WITH CARBON DIOXIDE
Page Range: p.1-23
Author(s): Gendron R; Champagne M F; Tatibouet J; Bureau M N
File size: 782K
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Issue Year: cp
Volume: 28
Issue No: No.1
Abstract
The foam processing of commercially available norbornene-ethylene copolymers (Topas 8007 and Topas 5013) with Tgs varying between 80 and 130 degrees C was investigated. Thick sheets of the copolymers were charged to various extents with carbon dioxide and foamed in a biaxial laboratory stretcher programmed to compensate uniformly for the expansion of the sheet by stretching. The rheological properties and plasticisation of the copolymers and solubility and diffusivity of carbon dioxide in the copolymers were examined and mechanical properties of the foams determined. The effects of selected processing parameters (temperature, preheating time, speed of deformation and magnitude of stretching) on microcellular foam morphology and density were also examined. 19 refs.
Title: FABRICATION OF MICROCELLULAR HDPE FOAMS IN A SUB-CRITICAL CO"2 PROCESS
Page Range: p.25-40
Author(s): Miller D; Kumar V
File size: 442K
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Issue Year: cp
Volume: 28
Issue No: No.1
Abstract
The foaming of HDPE below carbon dioxide pressure of 5.5 MPa was investigated using a design of experiments approach to quantify the contributions of some processing parameters in the microcellular batch process. The density, microstructure and cell size of the foams were determined and foam density and cell structure related to processing conditions. Density reductions of up to 65% were obtained and a unique bimodal structure consisting of closed microcells with an interconnected nanoporous interior obtained. 16 refs.
Title: MAKING NANO TECHNOLOGY WORK IN FOAMS USING 1.5 NANOMETER TITANATE AND ZIRCONATE COUPLUING AGENTS - A REVIEW
Page Range: p.41-111
Author(s): Monte S J
File size: 1792K
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Issue Year: cp
Volume: 28
Issue No: No.1
Abstract
A comprehensive review is presented on the efficacy of titanates and zirconates in foamed unfilled and filled polymers with emphasis on their applications in nanocomposites. A discussion is included on the chemistry of the six functions of the titanate molecule as well as the selection, dosage, physics of mixing, catalysis and rheology, mixing temperatures, compounding considerations and interfacial chemistry. 144 refs.