Influence of microstructure and morphology on stress–strain behavior of commercial high density polyethylene

Abstract

In the previous paper (Zahedi et al., 1 J Appl Polym Sci, to appear) the optimal conditions of a new modeling procedure for correlating a scalar response to an input spectrum were established. In this article the developed model is applied to correlate the stress-strain behavior of several commercial high density polyethylene samples to the spectrums of microstructure and morphology. Molecular weight and lamellar thickness distributions were considered as the input spectrums and Young modulus, stress and strain at the yield and break points were considered as the objective responses. The shape of the kernel functions over molecular weight and lamellar thickness distribution spectrums for each mechanical property gives an explanation of how different regions of the spectrums contribute to create the considered property. The simplicity of the procedure facilitates the interpretation of the complex influences and interactions of different structures and morphologies in various aspects of the mechanical performance of the samples. The proposed model can be used in designed experiments with samples of controlled microstructure and morphology to provide detailed information about the structure-property relationships.

Indirect Synthesis of Bis(2‐PhInd)ZrCl2 Metallocene Catalyst, Kinetic Study and Modeling of Ethylene Polymerization

“…It can be noticed that by the decrease of molecular weight with increasing polymerization temperature, the crystallinity of the polymer was increased. The behavior could be due to more mobility of polymer chains with lower molecular weight [49]. Higher catalyst activity was obtained at higher monomer pressure.…”

Characteristics of linear/branched polyethylene reactor blends synthesized by metallocene/late transitional metal hybrid catalysts

“…It is well known that the final properties of polyolefins are mainly affected by chain microstructure including molecular mass distribution (MWD) and type and extent of branching [1][2][3]. Therefore, devising new catalytic systems to explore and control chain microstructures has been the main research focus of many industrial and academic groups.…”

Realistic Representation of Kinetics and Microstructure Development During Chain Shuttling Polymerization of Olefin Block Copolymers

“…Polyolefins as the most worldwide produced polymer commodity have versatile applications due to cheapness of raw materials, great flexibility in devising chain microstructure, and the consequent properties. Developing new methods for controlling or introducing new microstructural features besides expansion of knowledge on structure properties relationship have been therefore become one of the main interests of the involved industrial and academic groups …”