Microcellular Structure of a Thin Polycarbonate Sheet Prepared by

Document Sample
Microcellular Structure of a Thin Polycarbonate Sheet Prepared by Powered By Docstoc
					Microcellular Structure of a Thin Polycarbonate Sheet Prepared
                  by Compression Molding1,2
         Xiao Zhaoxin, Li Yinglin, Liu Juan, Lu Deping, Yang Shifang, and Guan Rong
            College of Chemistry and Chemical Engineering, Hubei University, Wuhan, 430062, China
                                        e mail: rongguan@hubu.edu.cn
                                           Received November 5, 2008;
                                    Revised Manuscript Received March 4, 2009

  Abstract—Microcellular thin polycarbonate sheets have been prepared by compression molding with the cell
  size in the range of 2~20 microns, and cell density larger than 108 cells/cm3. The effect of processing param
  eters on the microcellular polycarbonate structure has been investigated. The cell size decreases with increas
  ing foaming time till 8 minute and then increases. Besides this parameter slightly decreases with increasing
  foaming pressure, but increases with increasing temperature. The variation of cell density is contrary to that
  of cell size, and the foam density decreases with increasing foaming pressure and foaming temperature and
  displays a variable trend with increasing foaming time under different foaming pressures.
  DOI: 10.1134/S0965545X09090077