Nonisothermal crystallization behavior and crystals morphology of poly(trimethylene terephthalate)/nano‐calcium carbonate composites

Abstract

Nonisothermal crystallization behavior and crystal morphology of poly(trimethylene terephthalate) (PTT) composites filled with modified nano-calcium carbonate (CaCO 3 ) had been investigated by using differential scanning calorimetry and polarized optical microscopy. The modified Avrami equation and Ozawa theory were used to investigate the nonisothermal crystallization, respectively. The particles of nano-CaCO 3 , acting as a nucleation agent in composites, accelerated the crystallization rate by decreasing the half-time of crystallization or increasing the parameters of Z c and K(T). Moreover, the nano-composite with 2 wt% nano-CaCO 3 exhibited the highest crystallization rate. The Avrami and the Ozawa exponents, n and m of the nano-composites, were higher than those of neat PTT, suggesting more complicated interaction between molecular chains and the nanoparticles that cause the changes of the nucleation mode and the crystal growth dimension. The effective activation energy calculated from the Friedman formula was reduced as nano-CaCO 3 content increased, suggesting that the nano-CaCO 3 made the molecular chains of PTT easier to crystallize during the nonisothermal crystallization process. The optical micrographs showed that much smaller or less perfect crystals were formed in composites because of the presence of the nano-CaCO 3 particles.

Mechanical, thermal, and transport properties of nitrile rubber–nanocalcium carbonate composites

“…The reinforcing effect of NCC in polyethylenes and polyvinyl chloride has been demonstrated in various studies 13–16. In recent years, similar studies have been done on other thermoplastics and thermosets filled with NCC 17, 18…”

Crystallization, melting, and mechanical behavior of calcium carbonate‐based nanocomposites of crosslinked high density polyethylene

“…In this case, polyethylene (PE) has special position because of low cost, easy availability, light weight, high corrosion, chemical resistance, etc. which makes vast usage in different fields . One of the main deficiencies of PE is depressed critical physical properties at the elevated temperatures, which limits its applications.…”

Preparation, morphology and properties of poly(trimethylene terephthalate)/maleinized poly(octene–ethylene)/organomontmorillonite nanocomposites

“…1 Researchers have reported some blends and composites of PTT with other polymers, fillers or fibres. 2 –17 Run et al 4 reported the isothermal crystallization and melting behavior of PTT/nano-CaCO 3 nanocomposites, the results suggest that nano-CaCO 3 increases the crystallization rate of PTT. Liu et al 5 reported the PTT/organomontmorillonite (OMMT) nanocomposites and suggest that the thermal stability and the storage modulus have been greatly improved because of the nanometer-scale layers of the OMMT.…”