Branched poly[1,4-butylene carbonate-co-terephthalate]s (PBCTs) have been synthesized by the addition of a small amount of glycerol propoxylate (1) or pentaerythritol (2) in the polycondensation of 1,4-butanediol, dimethyl carbonate, and dimethyl terephthalate. To avoid gel formation, the feed amount of 1 or 2 was carefully controlled at below 0.5 mol % for 1 and below 0.3 mol % for 2. When feed of 1 or 2 was used, a high-molecular weight melt state (M w 180,000 g/mol) was reached in a total reaction time of 5.5 to 6.5 h with a yield higher than 90%. The generated PBCTs were a semicrystalline polymer (T g 5 C and T m 120 C) when the terephthalate content (F [TPA] ) was 45 to 50 mol %. The crystallization rate

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