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In situ melt polycondensation was proposed to prepare biodegradable aliphatic-aromatic copolyesters/nano-SiO_2 hybrids based on terephthalic acid(TPA),poly(L-lactic acid) oligomer(OLLA),1,4-butanediol(BDO) and nano-SiO_2.TEM and FT-IR characterizations confirmed that TPA,OLLA and BDO copolymerized to obtain biodegradable copolyesters,poly(burylene terephthalate-co-lactate)(PBTL),and the abundant hydroxyl groups on the surface of nano-SiO_2 provided potential sites for in situ grafting with the simultaneous resulted PBTL.The nano-SiO_2 particles were chemically wrapped with PBTL to form PBTL/nano-SiO_2 hybrids.Due to the good dispersion and interfacial adhesion of nano-SiO_2 particles with the copolyester matrix,the tensile strength and the Young’s modulus increased from 5.4 and 5.6 MPa for neat PBTL to 16 and 390 MPa for PBTL/nano-SiO_2 hybrids with 5 wt.%nano-SiO_2,respectively.The mechanical properties of PBTL/nano-SiO_2 hybrids were substantially improved.
In situ melt polycondensation was proposed to prepare biodegradable aliphatic-aromatic copolyesters / nano-SiO 2 hybrids based on terephthalic acid (TPA), poly (L-lactic acid) oligomer . TEM and FT-IR characterizations that that TPA, OLLA and BDO copolymerized to obtain biodegradable copolyesters, poly (burylene terephthalate-co-lactate) (PBTL), and the abundant hydroxyl groups on the surface of nano-SiO 2 provided potential sites for in situ grafting with the terminally diluted PBTL. The nano-SiO 2 particles were chemically wrapped with PBTL to form PBTL / nano-SiO 2 hybrids. Due to the good dispersion and interfacial adhesion of nano-SiO 2 particles with the copolyester matrix, the tensile strength and the Young’s modulus increased from 5.4 and 5.6 MPa for neat PBTL to 16 and 390 MPa for PBTL / nano-SiO 2 hybrids with 5 wt.% Nano-SiO 2, respectively.The mechanical properties of PBTL / nano-SiO 2 hybrids were substantially improved.