α-1,3-Glucan is a linear homopolymer enzymatically polymerized from sucrose using recombinant glucosyl transferase J (GtfJ) enzyme. α-1,3-Glucan branched ester derivatives were synthesized from branched carboxylic acids and trifluoroacetic anhydride in a heterogeneous reaction. These derivatives showed unconventional thermal properties compared with other polysaccharide ester derivatives and oil-based plastics. The melting temperature (T_m) of the α-1,3-Glucan branched ester derivatives increased in proportion to the side chain length, which has not been observed for other polysaccharide ester derivatives. In addition, isobutyrate ester derivatives (iso-branched ester derivatives) and pivalate ester derivatives (tert-branched ester derivatives) showed extremely high glass transition temperatures (T_g) of 206 and 202 °C, respectively, which were much higher than those of commercial plastics, such as polyethylene terephthalate (PET: 69 °C) and polycarbonate (140 °C), and super engineering plastics, such as polyether ether ketone (PEEK: 142 °C). Furthermore, these two types of branched ester derivatives showed excellent thermoplasticity at temperatures below the thermal decomposition temperature. Therefore, α-1,3-Glucan branched ester derivatives demonstrate the possibility of realizing both high thermal stability and thermoplasticity.

α-1,3-葡聚糖是使用重组葡糖基转移酶J（GtfJ）酶从蔗糖中酶促聚合而成的线性均聚物。α-1,3-葡聚糖支链酯衍生物是由支链羧酸和三氟乙酸酐在非均相反应中合成的。与其他多糖酯衍生物和油基塑料相比，这些衍生物表现出非常规的热性能。α-1，3-葡聚糖支链酯衍生物的熔融温度（T _m）与侧链长度成比例地增加，这对于其他多糖酯衍生物没有观察到。此外，异丁酸酯衍生物（异支链酯衍生物）和新戊酸酯衍生物（叔-支链酯衍生物）的玻璃化转变温度（T _g）分别高达206和202°C，远高于诸如聚对苯二甲酸乙二酯（PET：69°C）和聚碳酸酯（140°C）的商业塑料。 C）和超级工程塑料，例如聚醚醚酮（PEEK：142°C）。此外，这两种类型的支链酯衍生物在低于热分解温度的温度下显示出优异的热塑性。因此，α-1，3-葡聚糖支链酯衍生物证明了实现高热稳定性和热塑性的可能性。