Tensile and anti-UV aging properties of polyvinylidene fluoride (PVDF)/polymethyl methacrylate (PMMA) blends prepared by melting compounding were investigated.The results indicated that PVDF had a good miscibility with little PMMA (10 wt%) so that the blend was homogeneous and had the best tensile properties and weatherability.On the other hand

significant phase separation occurred in the blends containing more than 20 wt% PMMA

which led to marked reductions in tensile properties and weatherability.PMMA played a role of diluent that accelerated molecular movements and reduced relaxation time of the blend.Because of the habit of PVDF tending to self-entangle in the blends

improving molecular motion at high temperatures could lead to the occurrence of phase separation.The binodal temperature of blends was got by the small amplitude temperature scanning experiment

which decreased with increasing PMMA content.The results did not follow some previous researches on solution casting blends.Crystallinity of PVDF increased and melting point decreased with increasing PMMA content.However

XRD results indicated that PMMA did not change the crystal structure of PVDF.Furthermore

TGA tests revealed that there was no synergistic effect between thermal decompositions of PMMA and PVDF in the blends.