摘要
用DPMS、TG、DTA等方法研究了聚β-羟基丁酸酯(PHB)及其共聚物P(HB-co-HV)的热分解行为和某些结构性质.能提供多至7个链节重复单元的裂解碎片.可较好地反应共聚物的组成和分布.结果表明:聚β-羟基烷酸酯的热分解具有较高的选择性,通过β-H转移反应形成由羧基和烯烃结尾的齐聚物.齐聚物准分子离子可进一步脱去一分子水.
Thermal decomposihon processes in poly(β-hydroxybutyrate)(PHB) and Poly (β-hydroxybutyrate-co-β-hydroxyvalerates) [P(HB-co-HV)s] with composihon ratios HB/HV of 96:4 and 82:18 were investigated by direct pyrolysis mass spectrometry (DPMS). It can provide up to hoptelner pyrolynates and estimate the composition and sequence distribution of copolymers. The results indicate that the thermal degradation of PHB and P(HB-co-HV) occurs quite selctively through a β-Hydrogen transfer process, with formation of oligomers bearinng carboxyl and olefin end-groups. Oligomeri groducts corresponding to dehydrated monomer up to heptamer were also identified both in the case of PHB and P(HB-co-HV).
出处
《高分子学报》
SCIE
CAS
CSCD
北大核心
1995年第6期648-652,共5页
Acta Polymerica Sinica
基金
中国科学院高分子物理联合开放研究实验室资助
关键词
聚羟基丁酸酯
聚羟基戊酸酯
质谱
Hydroxybutyrate, β-Hydroxyvalerate, Polymers, Mass Spectrometry, Pyrolysis