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Abstract:
The carboxyl-terminated modified polylactic acid copolymers of P(LA/SA), P(LA/CA) and P(LA/AC) were synthesized via directly melt polycondensation with D, L-racemic lactic acid (D, L-LA) as raw material and stannous octoate as catalyst. The copolymerization reaction was performed at the temperature of 168°C and the pressure of 0.098 MPa using linear heating method. The copolymers were characterized by viscosity-average molecular weight, FT-IR, 1H-NMR, DSC, TGA and XRD. The results demonstrate that Tg of the carboxyl-terminated copolymers is lower than PLA, reducing the rigidity of PLA; the copolymers have good thermal stability for one-step thermal decomposition; compared with PLA, the crystallinity of P(LA/SA) and P(LA/AC) decreased, while the P(LA/CA) slightly decreased, so that, by adjusting the ratio of lactic acid and modifier to adjust the mechanical properties.
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Journal of Functional Materials
ISSN: 1001-9731
CN: 50-1099/TH
Year: 2011
Issue: SUPPL. JUNE
Volume: 42
Page: 541-543,548
Cited Count:
WoS CC Cited Count: 0
SCOPUS Cited Count:
ESI Highly Cited Papers on the List: 0 Unfold All
WanFang Cited Count:
Chinese Cited Count:
30 Days PV: 2
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