Poly(ethylene terephthalate), modified with bisphenol S units, with increased glass transition temperature

Abstract

Novel copolyesters have been prepared by melt mixing poly(ethylene terephthalate) (PET) with an ethoxylated bisphenol S, with the aim to prepare new polyesters with increased Tg, to be used in a wider range of temperatures with respect to neat PET. No side reactions occur during the synthesis of the samples, as proved by NMR analysis. The insertion of the bisphenol S (sulfonyldiphenol) groups does not significantly alter the thermal stability of PET. The thermal analysis showed that Tm and crystallization rate of the copolymers decreased with incasing co‐unit content. The Tg of the copolyesters can be increased by bisphenol S insertion, up to 40°C higher with respect to neat PET, that allows the use of amorphous PET in a wider range of applications. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013

Processing and thermal properties of composites based on recycled PET, sisal fibers, and renewable plasticizers

“…Figure (b) shows a decrease in the T g values of the composites compared to CTRPET. The T g at 82°C for CTRPET is consistent with the values reported in the literature for virgin PET and recycled PET ( T g between 70°C and 80°C) . The presence of plasticizers between the chains reduces the intensity of intermolecular interactions between their segments and increases their mobility, which decreases the T g of the polymer matrix.…”

PET copolyesters made from ad-mannitol-derived bicyclic diol

“…Nevertheless, there is currently a growing interest in increasing the glass transition temperature (T g ) of PET to extend its use to new demanding applications such as the hot-filled and pasteurizedcontainer fields. [2][3][4] Moreover, PET is markedly hydrophobic and more resistant to hydrolysis than is usually needed in many of its most common applications. Despite being innocuous for humans, it is considered not to be an environmentally friendly material because of its non-renewable origin.…”

Bisphenol A and its analogs induce morphological and biochemical alterations in human peripheral blood mononuclear cells (in vitro study)

“…For example, 62 the production of bisphenol AF (BPAF) only in the USA has reached 63 250 tons (NTP, 2008). Similarly, worldwide production of bisphe-64 nol S (BPS) has raised significantly, which is associated with 65 replacement of BPA with BPS in the production of numerous prod-66 ucts made from polymers (including baby bottles and food con-67 tainers) and thermal paper (Liao et al, 2012a;Lotti et al, 2013). 68 The exposure of the general population to bisphenols is mainly 69 related with food consumption, particularly canned food in which 70 BPA, BPF and BPS are contained in significant concentrations 71 (11.5-317 lg/dm 3 ) (Yonekubo et al, 2008;Viñas et al, 2010).…”