Abstract:

After coupling modification of starch with hexadecyltrimethoxysilane （HDTMS）， thermoplastic starch （TPS） was obtained through coupling modification with hexadecyltrimethoxysilane （HDTMS） and melt extrusion. The resultant TPS were subjected to direct blowing process with poly（adipic acid?co?butylene terephthalate） （PBAT）. The relationship between the HDTMS content and the heat resistance and rheological properties of TPS and the relationship between the hydrophobic property and mechanical performance of PBAT/TPS composite membranes were investigated. The results indicated that the processing properties of TPS were improved with the addition of HDTMS， resulting in better heat resistance but easier separation of the additive. The hydrophobic properties of composite membranes were improved with the addition of 1 phr HDTMS， and their contact angle increased to 113.2 °. The contact angle was kept basically at 104 °~106 ° with a continuous increase in the HDTMS content. The tensile strength of the composite membrane increased at first and then decreased with an increase in the HDTMS content. The tensile strength reached 10.29 MPa when 3 phr HDTMS was incorporated.

Key words: thermoplastic starch, hexadecyltrimethoxysilane, coupling, poly（adipic acid?co?butylene terephthalate）, fully biodegradable material, film