羟基脂肪酸聚酯制备与热性质研究

不同的碳源条件下，真养产碱杆菌可在胞内积累聚羟丁酸(PHB)或含羟基戊酸单体(HV)比例不等的聚羟丁戊酸共聚物(PHBv)。利用次氯酸钠，氯仿混合液体系提取上述羟基脂肪酸聚酯(PHA)，提取率为85％，纯度达97．O％。以差示扫描热分析法对PHB和PHBV材料进行热性质研究，发现材料中的HV组分逐渐增加．材料的熔点Tm，熔化焓Hm逐渐下降。热分解峰值逐渐向低温区偏移。但含HV为6lmol％的PHBV材料有关热性质出现回升现象。

Polyhydroxyalkanoates Preparation and Thermo Properties

Alkaligenes eutrophus could produce polyhydroxybutyrate (PHB) or polyhydroxybutyrate co valerate(PHBV) containing different ratio of hydroxybutyrate(HB)/hydrovalerate(HV).The polyhydroxyalkanoates(PHA) were extracted by hypochlorite chloroform mixture with the recovery rate of 85% and purity of 97.0%.The thermoproperties of the prepared PHB and PHBV materials were studied with the method of Differential Scanning Calorimetry (DSC).It was found that with gradual increasing of the ratio of HV/HB in PHBV to 35 mol%,the melting points,melting enthalpy and the heat decomposition peak values of the materials gradually dropped.But the values of the above thermoproperties of PHBV containing HV component of 61mol% go up again.