聚β-羟基丁酸酯/聚氧化乙烯共混体系力学性能研究

MECHANICAL PROPERTIES OF POLY( β-HYDROXYBUTYRATE)/ POLY(ETHYLENE OXIDE) BLENDS

本文详细研究了可完全生物降解的聚 β 羟基丁酸酯 (PHB)与水溶性聚氧化乙烯 (PEO)两元共混体系的拉伸力学性能 .讨论了PEO分子量、共混组成及热处理条件对共混体系力学性能的影响 .其中 ,PHB与超高分子量PEO(重均分子量 5× 10 6)共混 ,两组分力学上具有相容性 ,共混物的拉伸强度、断裂伸长率及模量都有明显的正的协同效应 .共混改性效果显著PHB的力学性能得到很大改善 ,尤其PHB的脆性缺陷 .并且 ,共混物在经过适当温度退火处理之后 。

Tensile properties of poly( β \|hydroxybutyrate)/poly(ethylene oxide)(PHB/PEO) blends were reported in this paper.It was found that the blends of PHB with different molecular\|weight PEO exhibited different mechanical properties.The mechanical properties of the blends of PHB and PEO3( M \-w=0\^3×10\+6) were very poor.However,the blends of PHB and PEO5( M \-w=5×10\+6) showed compatible in mechanical properties.Excellent synergism was observed not only in tensile stress and tensile elongation but also in modulus.Moreover,the ductility of the blends could be improved further under proper heat\|treatment.