A NEW TYPE WPC COMPOSITE MATERIAL FROM TERNARY GRAFT POLYMERIZATION OF STYRENE, METHYE METHACRYLATE AND ACRYLONITRITE Preparation and Characterization of Self-Emulsifying Styrene Acrylate Emulsion Used as Surface-Treatment Agent for Decorative Base Paper Study on Technics Parameter of Wheat Stalk/Polystyeren Composites Study on matrix proportion of hydrophilic SIS hot melt pressure sensitive adhesive suit modified by RLPO Effects of different wall materials on the performance of heat preservation of wall of sunlight greenhouse