Journal of Industrial and Engineering Chemistry, Vol.4, No.2, 135-139, June, 1998
Toughening of PMMA with PU/PMMA Composite Particles
Composite rubbery particles, in which chains of crosslinked polyurethane and polymethyl-methacrylate, are intimately mixed in molecular levels are synthesized. The PU/PMMA composite particles are made by dispersing crosslinked polyurethane prepolymer in water and then mixing with MMA monomer, which is subsequently polymerized with or without crosslinking agent. The composite particles enhance the tougheness of PMMA resin when they are blended with PMMA. Semi-IPN type PU/PMMA composite particles in which PMMA is not crosslinked are found to be more effective toughening agent than full-IPN type particles in which PMMA is crosslinked. However, the semi-IPN type particles lead to the reduction in the transparency of the matrix PMMA more significantly than the full-IPN Ive particles.
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