Quantifying the Effect of Polyethylene Molecular Weight, Comonomer Fraction, and Comonomer Type on High-Temperature Thermal Gradient Interaction Chromatography

Abstract

High-temperature thermal gradient interaction chromatography (HT-TGIC) can be used to measure the chemical composition distribution of ethylene/α-olefin copolymers using a column packed with porous graphitic carbon. It is generally assumed that polymer molecular weight plays a secondary role in HT-TGIC fractionation, but this assumption is incorrect for lower-molecular-weight polymers. In this article, we developed a general calibration curve to quantify the effect of polymer molecular weight, α-olefin fraction, and type (1-hexene, 1-octene, and 1-decene) on HT-TGIC peak temperatures and discussed its implications on converting HT-TGIC profiles into chemical composition distributions.

Using Probability Models to Design the Microstructure of Linear Olefin Block Copolymers

“…The molecular weight distribution (MWD) and chemical composition distribution (CCD) of ethylene/1-olefin copolymers determine their properties . The MWD is typically quantified by gel permeation chromatography, − while the CCD can be measured by temperature rising elution fractionation, − crystallization elution fractionation, crystallization analysis fractionation, − and high-temperature thermal gradient interaction chromatography. − However, these analytical techniques can only measure the distribution of the 1-olefin fraction in statistical copolymers. They are inadequate to characterize the features of the OBC microstructure such as the distribution of number of blocks in the copolymer population, the distributions of lengths of hard and soft blocks, and the distribution of chains with specific chemical compositions.…”

A Strategy Based on Aggregation‐Induced Ratiometric Emission to Differentiate Molecular Weight of Supramolecular Polymers

“…[3] Additionally, with the increase in molecular weight, polyethylene can also find its applications in PE wax, automotive fuel tanks, and body armor. [4] Thus, it is of great significance to differentiate the molecular weight of polymers.…”

“…In contrast, polyethylene glycol is more appropriate for therapeutic antibody fragments and PEGylated drugs at a higher molecular weight level [3] . Additionally, with the increase in molecular weight, polyethylene can also find its applications in PE wax, automotive fuel tanks, and body armor [4] . Thus, it is of great significance to differentiate the molecular weight of polymers.…”