Physical and mechanical properties of nano-CaCO₃/PP composites modified with acrylic acid

Abstract

Nano-CaCO 3 /polypropylene (PP) composites modified by the reactive monomer acrylic acid (AA) with or without the initiator dicumyl peroxide (DCP) were prepared using a two-step method. The effects of nano-CaCO 3 and AA on the physical and mechanical properties of nano-CaCO 3 /PP composites were investigated. Differential scanning calorimetry (DSC) results showed that the incorporation of nano-CaCO 3 increased the crystallisation temperature as a result of the heterogeneous nucleation effect of nano-CaCO 3 on PP, and induced the formation of b phase PP. The addition of AA further increased the crystallisation temperature of PP and the intensity of b phase PP. The mechanical tests indicated that nano-CaCO 3 could simultaneously reinforce and toughen PP, and the mechanical properties of nano-CaCO 3 /PP composites were higher than those of micro-CaCO 3 /PP composites. In addition, incorporation of AA further increased the mechanical properties of the composites. In the presence of DCP, a small amount of AA could increase markedly the mechanical properties of nano-CaCO 3 /PP composites.

Crystallization and melting behavior of polypropylene in β-PP/polyamide 6 blends containing PP-g-MA

“…However, b-PP has less stability than a-PP and large contents of b-crystal can only be obtained in special crystallization conditions. For example, the introduction of b nucleating agents [7][8][9], temperature gradient [10], and shear melting [11]. Moreover, the yield strength and elastic modulus of b-PP are smaller than those of a-PP.…”

Synthesis of new polyether titanate coupling agents with different polyethyleneglycol segment lengths and their compatibilization in calcium sulfate whisker/poly(vinyl chloride) composites

“…4,5 Thus, attempts have been made to impart required properties (e.g., toughness, modulus and heat resistance) to the PVC materials by incorporating various llers into the PVC matrix. [6][7][8] Various llers, such as organic elastomers [9][10][11][12] and reinforcing agents, 6 as well as inorganic natural bers, 13,14 whiskers 15-17 and nanoparticles [18][19][20][21][22] have been shown to be capable of improving the comprehensive performance of PVC composites. Calcium sulfate whiskers (CSWs) as a reinforcing ller can dramatically improve the impact resistance, modulus and thermal resistance of PVC composites, 17,23 as they have integrated shape, high intensity, high-temperature resistance and high tenacity.…”

Toughening and reinforcement of rigid PVC with silicone rubber/nano‐CACO3 shell‐core structured fillers

“…Other nanoparticles such as nanometric CaCO 3 , SiO 2 , TiO 2 , and ZnO particles have been used to prepare nanocomposites. [10][11][12][13] And nano-CaCO3 has been one of the most commonly used inorganic fillers for PVC. [14][15][16] Wu et al studied the mechanical properties, morphology, and rheology of the system chlorinated polyethylene (CPE)/nano-CaCO 3 master batch as reinforcement filler in PVC; CPE as an interfacial modifier were studied.…”