مرکز منطقه ای اطلاع رساني علوم و فناوري -

چكيده لاتين :

Sheets of poly(3-hydroxylbutyrate-co-4-hydroxylbutyrate)[P(3HB-c0-4HB)] with various 4HB contents and triethyl citrate (TEC) plasticization are prepared by melt mixing and compression moulding. The thermal, crystalline and mechanical properties of these sheets are evaluated. Furthermore, fracture surfaces of samples plasticized by TEC are examined by scanning electron microscope (SEM). The results show that the increase of 4HB content can lead to the decrease of thermal parameters of samples such as melting temperature, glass transition temperature, crystalline temperature and crystallinity. However, the elongation-at-break of samples increases with the 4HB content increasing, and the strength-at-break decreases as a whole. The incorporation of 4HB units can improve the thermal stability of copolymer. The effect of TEC on the thermal and mechanical properties of samples is similar with that of 4HB unit. In contrast to 4HB unit, the increase of TEC content can worsen the thermal stability of samples. In addition, the copolymer of P(3HB-co-4HB) is compatible with TEC and its ductility can be improved by incorporation of TEC.