Preparation and Properties of Poly(3-hydroxybutyrate-co-3-hydroxyvalerate) and Polypropylene Grafting Maleic Anhydride Two-Component Materials

Abstract

In order to provide a theoretical basis for the preparation and spinnability of two-component materials, poly(3-hydroxybutyrate-co-3-hydroxyvalerate)(PHBV) and polypropylene grafting maleic anhydride (PP-g-MAH) blends were prepared by melt mixing with different ratios (100/0, 75/25, 50/50, 25/75, 0/100). Properties of the blends system were investigated by means of a mixed rheometer, scanning electron microscope, simultaneous thermal analyser, differential scanning calorimetry and X-ray diffraction. The results demonstrate that PHBV/PP-g-MAH blends exhibit different morphology of the sea-island with a change in the mix ratio. The initial thermal decomposition temperature of PHBV in the blending system is over 250 °C, which means the thermal stability of PHBV is markedly improved. The crystallisation of PHBV varied according to the blending process parameter. When the cooling velocity increases, the crystallisation peak becomes wide, the temperature of crystallisation decreases, and the crystallisation temperature of PHBV increases significantly. PHBV has a high sensitivity to variation in the shear rate, and PHBV/PP-g-MAH blends have the mixing characteristic of shear thinned liquid. There is no diffraction peak at 2θ = 22.8°, and this result certifies that PP-g-MAH changes the crystal form of PHBV. and that PP-g-MAH addition is beneficial to the spinnability of PHBV. Results show that the interplay between PHBV and PP-g-MAH is of great significance and universal for both plastics and fibres.

Effects of sulfonation on bis‐styrylbiphenyl fluorescent whitening agents for polypropylene

“…Characterized by stability, low price, and extensive adaptability, PP‐g‐MAH is a popular plastic . On the other hand, because of nonpolarity and high crystallinity, PP has poor compatibility with polar additives .…”

“…Preparation of PP grafted with maleicanhydride (PP‐g‐MAH): A mixture of PP (10 g) and dimethylbenzene (20 mL) was stirred at 110 °C until homogeneously mixed before the addition of maleicanhydride (MAH). Then, a solution of benzoperoxide (0.4 g) in dimethylbenzene was added dropwise into the reaction mixture under stirring at 125 °C in a course of 30 min, followed by stirring at 130 °C for 3 h before being cooled to 60 °C.…”