Combined effect of isophthalic acid and polyethylene glycol in polyethylene terephthalate polymer on thermal, mechanical, and gas transport properties

Abstract

The objective of this article is to study the combined effect of isophthalic acid (IPA) and polyethylene glycol (PEG-400) in PET polymer and film on thermal, mechanical, and gas transport properties. The purpose of developing this material is to reduce the melting point, improve mechanical, thermal, and gas barrier properties. The chosen raw materials, namely, IPA and PEG for copolyester synthesis will replace partially the acid and diol monomers of PET. The molar concentration of comonomers (IPA and PEG-400) were varied from 2 to 50% and the result shows that the gas barrier properties (namely O 2 , CO 2 , N 2 , and water vapor transmission rate), mechanical, and thermal properties were lesser than that of PET polymer. On improving the crystallinity of PET-isophthalate-PEG (PET-IP) copolymer, barrier properties are improved than that of PET polymer. V C 2012 Wiley Periodicals, Inc. J Appl Polym Sci 126: [536][537][538][539][540][541][542][543] 2012

Highly Efficient Solid‐State Hydrolysis of Waste Polyethylene Terephthalate by Mechanochemical Milling and Vapor‐Assisted Aging

“…Another set of low‐intensity aromatic signals from 7.64 to 8.48 ppm can be ascribed to isophthalic acid (IPA), an impurity typically found in recycled TPA [39] . The presence of IPA is not surprising since it is used as a copolymer to modify the physical properties of PET during polymerization [40] . This compound was present in all samples in approximately 2 %, while the content of MHET varied [except for LAG with methanol, where 2 % of monomethyl terephthalic acid (MMT) was also detected].…”

“…[39] The presence of IPA is not surprising since it is used as a copolymer to modify the physical properties of PET during polymerization. [40] This compound was present in all samples in approximately 2 %, while the content of MHET varied [except for LAG with methanol, where 2 % of monomethyl terephthalic acid (MMT) was also detected]. Taking the ethylene CH 2 triplet signal at 4.31 ppm (J = 4.8 Hz) as the diagnostic one, the relative amount of MHET (compared to reaction without the additive) increased threeand five-fold as the NaCl/PET weight ratio went from 0 to 1 and 1.5, respectively (Figure 2a-c).…”

Influence of cyclobutane segments in cycloaliphatic decahydronaphthalene-containing copolyesters

“…Furthermore, these values were consistent with previous literature of highmolecular-weight polyesters. 2,5,9,25 Manipulating the ratio of CBDO to CHDM provided novel, optically clear copolyesters containing decahydronaphthalate and CBDO. Introduction of the rigid cyclobutane ring systematically increased the T g following the Fox equation, confirming a random sequence in the copolymer (Figure 2).…”

2,5-Tetrahydrofurandimethanol as a sustainable comonomer for modification of polyethylene terephthalate: Liter-level pilot test and non-isothermal crystallization kinetics

“…[2][3][4] 2 mol% IPA was usually incorporated into PET to inhibit its crystallization activity for improving the transparency of the end products, 5 reducing the processing temperature, and making processing more easily in injection and blow moulding. [6][7][8] As fibre, PET was improved moisture absorption and dyeing properties after polymerizing with IPA. 9 1,4-Cyclohexanedimethanol (CHDM) was another comonomer which gave the copolyesters better toughness and higher T g because of its alicyclic structure.…”