Citation:
LU Ling-Bin, HUANG Ke-Long. Preparation of Biodegradable Aliphatic Poly (propylene-co-γ-butyrolactone carbonate) Microcapsules[J]. Chinese Journal of Applied Chemistry,
;2005, 22(3): 250-254.
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Poly (propylene-co-γ-butyrolactone carbonate) PPCG was synthesized from carbon dioxide,1,2-propylene oxide (PO) and γ-butyrolactone (GBL).The PPCG-dextrose microcapsules were prepared by the diphase emulsion method with gelatin as stabilizer.The structure of the copolymer was characterized by FT IR,1H NMR and 13C NMR.The PPCG was found to be more degradable than polyethylene carbonate (PPC) and could be used in fabrication of microcapsules for long-term drug-releasing technique.The SEM photos indicate that the micro capsules have a smooth and spherical surface sized between 2~2.5 μm.The influences of V(PPCG):V(dextrose),gelatin concentration and preparation process on microcapsules size,drug loading and encapsulation efficiency were studied.When V(PPCG):V(dextrose) is 1:2,ω(gelatin)=0.2%,the first stirring rate 500 r/min,the second stirring rate 400 r/min and stirring time 6 h,the resulting microcapsules have drug loading of 36.7%,encapsulation efficiency of 84.6% and smaller particle size.
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