Zhang, Y and Wang, BT and Guo, ZH and Chen, J and Fang, ZP (2009) Preparation and characterization of biodegradable aliphatic-aromatic copolyesters/nano-SiO2 hybrids via in situ melt polycondensation. CHINESE CHEMICAL LETTERS , 20 (11). pp. 1348-1352. ISSN 1001-8417
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In situ melt polycondensation was proposed to prepare biodegradable aliphatic-aromatic copolyesters/nano-SiO2 hybrids based on terephthalic acid (TPA), poly(L-lactic acid) oligomer (OLLA), 1,4-butanediol (BDO) and nano-SiO2. TEM and FF-IR characterizations confirmed that TPA, OLLA and BDO copolymerized to obtain biodegradable copolyesters, poly(butylene terephthalate-co-lactate) (PBTL), and the abundant hydroxyl groups on the surface of nano-SiO2 provided potential sites for in situ grafting with the simultaneous resulted PBTL. The nano-SiO2 particles were chemically wrapped with PBTL to form PBTL/nano-SiO2 hybrids. Due to the good dispersion and interfacial adhesion of nano-SiO2 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-SiO2 hybrids with 5 wt.% nano-SiO2, respectively. The mechanical properties of PBTL/nano-SiO2 hybrids were substantially improved. (c) 2009 Zheng Ping Fang.
|Subjects:||Material Science > Nanochemistry|
|Deposited On:||30 Dec 2009 15:09|
|Last Modified:||30 Dec 2009 15:09|
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