Abstract: Abstract: The composites of grapheme sheet（GS）/ polybutylene terephthalate(PBT) and functional grapheme sheet(GS-KH550)/ polybutylene terephthalate(PBT) are fabricated by solution blending , the performance of PBT、GS/PBT、GS-KH550/PBT composites have been investigated. The results show that the melting temperature(Tm) and the crystallization temperature(Tc) of PBT increase slightly because of the addtion of grapheme sheet; GS and GS-KH550 promote crystallization of PBA and make it crystallizate perfectly , the crystallinity and crystal size increase but they don’t change the crystal type of PBT; The notched impact strength of functional grapheme sheet(GS-KH550)/ polybutylene terephthalate(PBT) composite obviously improve.

Key words: Keywords: polybutylene terephthalate, functional grapheme sheet, crystallization;notched impact strength