Paper Information

Journal:   IRANIAN POLYMER JOURNAL (ENGLISH)   2007 , Volume 16 , Number 12; Page(s) 839 To 849.
 
Paper: 

THE EFFECT OF PRESSURE DROP RATE ON THE MICROSTRUCTURES OF UNFILLED AND GLASS-FILLED ABS MICROCELLULAR FOAMS

 
Author(s):  MAHMOUDI MAHDI, BEHRAVESH AMIR HOSSEIN*
 
* DEPARTMENT OF MECHANICAL ENGINEERING, FACULTY OF ENGINEERING, TARBIAT MODARES UNIVERSITY, TEHRAN, IRAN
 
Abstract: 

Microcellular foams are foamed plastics characterized by a cell density typically greater than 109 cells/cm3, with fully grown cells on the order of 10 mm, and a weight reduction ranging from 5 to 95%. An inert gas such as CO2 or N2 is usually used as the blowing agent. Compared to the unfoamed polymers, microcellular foams exhibit improved mechanical and physical properties, for instance, high strength-to-density, high toughness, high fatigue life, thermal properties, low dielectric constant, and reduced material weight and cost. In this paper, the influence of the saturation pressure and its drop rate on the microstructures of unfilled and glass filled ABS prepared in a batch process were investigated. Cell size distribution and cell density of foamed samples are also compared at various pressure drops and rates. The results show that although pressure drop has a significant effect on the nucleation at room temperature, its rate does not, however, affect the microstructure of the foamed samples, considerably.

 
Keyword(s): MICROCELLULAR FOAMS, ABS FOAMS, BATCH PROCESS, PRESSURE DROP RATE, SATURATION PRESSURE
 
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