FEP/PMMA共混物相容性的研究

Study on Compatibility of Tetrafluoroethylene-Hexafluoropropylene Fluoride Binary Copolymer/Poly(methyl methacrylate)Blends

采用转矩流变仪制备了四氟乙烯-六氟丙烯二元共聚物(FEP)与聚甲基丙烯酸甲酯(PMMA)的共混物,考察了FEP/PMMA共混物的比例对流变特性、动态力学行为、热力学和力学性能的影响。动态力学测试发现,不同比例的FEP/PMMA共混物均呈现一个玻璃化转变温度,并且FEP/PMMA共混物的峰值位置逐渐向FEP靠近,数值变化表明二者具有一定的相容性。微观形态表明,PMMA呈球状分散在连续相FEP基体中,分散相粒子的尺寸在10~50μm之间,二者不完全相容。力学测试表明,FEP含量的增加使FEP/PMMA共混物的冲击强度、断裂伸长率提高,同时弹性模量、拉伸强度、弯曲强度降低。综上所述,FEP/PMMA共混物出现了相容的特征,但不是完全相容体系且共混物中FEP的结晶过程不受FEP/PMMA的比例所影响,结晶温度基本没有变化。

Tetrafluoroethylene-hexafluoropropylene fluoride binary copolymer(FEP)and poly(methyl methacrylate)(PMMA)were blended by melt blending.The influence of the composition of the FEP/PMMA blends on the rheological properties,dynamic mechanical behavior,thermodynamic behavior and mechanical properties of the FEP/PMMA blends was investigated.Dynamic mechanical behavior tests show that all of the FEP/PMMA blends with different compositions present a same glass-transition temperature(T g),the FEP/PMMA blends have a peak position and gradually approaching the FEP,then the numerical changes indicates that the FEP and PMMA are compatible.PMMA disperses in the form of sphere particles in the continuous FEP phase,and the particle diameter of the dispersed phase is between 10 and 50μm,which indicates these two are not entirely compatible.The mechanical properties test results show that the increase of FEP contents could increase the impact strength,elongation at break of FEP/PMMA composites,and the elasticity modulus,tensile strength and bending strength of the FEP/PMMA blends could decrease.In conclusion,the blends reflects the compatible characteristics,but it is not entirely compatible,and the composition and the crystallization temperature of the blends have little effect on the crystallization process of FEP in the blended.