This paper reports on sample preparation, characterization, CO2 sorption behaviour, and foaming of blends of poly L-lactic acid (PLLA) and poly methyl methacrylate (PMMA) in compositions of 75/25, 50/50, and 25/75 wt%. The crystallization and thermal decomposition behaviours of the polymer blends were found to be dependant on concentration of PLLA in the samples. Annealing the specimens in air at 90°C for 24 hours resulted in complete recrystallization in the 75/25 and 50/50 wt% samples. The interaction of CO2 with PLLA/PMMA blends was investigated and the resultant equilibrium solubility, diffusion coefficient and foam morphologies were compared to those previously reported for neat PLLA and PMMA-CO2 systems.

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Keywords Blends, CO2, Crystallization, Foams, Poly L-lactic acid (PLLA), Poly methyl methacrylate (PMMA)
Conference Society of Petroleum Engineers - 5th International Conference on Thermoplastic Foam, FOAMS 2006
Citation
Baisheng, Y. (Yao), Nawaby, A.V. (A. Victoria), Liao, X. (Xia), Day, M. (Michael), & Burk, R. (2006). Physical characteristics of PLLA/PMMA blends and their CO2 blown foams. Presented at the Society of Petroleum Engineers - 5th International Conference on Thermoplastic Foam, FOAMS 2006.