Objectives . To quantitatively describe the thermochromic properties of films isotactic polypropylene, a large-tonnage polymer widely used in production flexible packaging for goods and foodstuffs, as well substantiate possibility covert labeling transparent packaging. Methods Differential scanning calorimetry, polarization photometry, infrared Fourier spectrometry, gravimetry, temperature cont...

Abstract Nucleation efficiency and the special supermolecular structure formed in presence of novel nucleating agents, N,N′-dicyclohexylsuberoylamide N,N′-dicyclohexylsebacoylamide are presented this work. The nucleation effect is studied isotactic polypropylene (iPP). melting crystallization processes as well polymorphic composition using calorimetric thermo-optical techniques, while solubilit...

A finite element-based phase-field model was developed to simulate crystal growth in semi-crystalline polymers with various crystal morphologies. The original Kobayashi’s phase-field model for solidification of pure materials was adopted to account for polymer crystallization. Evolution of a nonconserved phase-field variable was considered to track the interface between the melt and the crystal...

The goal of this effort is to provide an accurate simulation of multifilament fiber melt spinning, applicable for a wide range of material and process conditions. For ease of use, the model should run on a standard laptop or desktop computer in reasonable time (one hour or less). Most melt spinning models simulate the formation of a single filament, with little or no attention given to multifil...

Isotactic polypropylene/multi-walled carbon nanotube (iPP/MWCNTs) films have been exposed to accelerated weathering in a UV device for increasing times. The effect of UV irradiation on the structural and chemical changes has been investigated. The resistance to accelerated photooxidation of (iPP/MWCNTs) films has been compared to the photooxidation behaviour of unfilled polypropylene films with...