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2 results on '"Gan, Ziyao"'

1. Facile synthesis of PET-based poly(ether ester)s with striking physical and mechanical properties

Author

Gan Ziyao, Jing Yang, Shuang Qu, Tan Tianwei, and Shangjian Li

Subjects
Terephthalic acid, Condensation polymer, Ethylene, Polymers and Plastics, Ethylene oxide, General Chemical Engineering, 02 engineering and technology, General Chemistry, 010402 general chemistry, 021001 nanoscience & nanotechnology, 01 natural sciences, Biochemistry, Methanesulfonic acid, 0104 chemical sciences, chemistry.chemical_compound, chemistry, Polymer chemistry, Materials Chemistry, Environmental Chemistry, Hydroxymethyl, Titanium isopropoxide, 0210 nano-technology, Ethylene glycol
Abstract

New poly(ethylene terephthalate) (PET)-based poly(ether-ester)s were successfully synthesized, by using the bicomponent catalyst of titanium isopropoxide (TPT) and methanesulfonic acid (MSA) to directly catalyze polycondensation of terephthalic acid and ethylene glycol, for randomly copolymerizing poly(ethylene terephthalate) (PET), poly(diethylene terephthalate) (PDET) and poly(ethylene oxide terephthalate) (PEOT), which denoted as linear PET-co-PDET-co-PEOT. The chemical structures of PET-co-PDET-co-PEOT were evidenced by two-dimensional and one-dimensional nuclear magnetic resonance (2D and 1D-NMR) techniques, and the segment contents of the poly(ether-ester) were tunable by adjusting the feeding molar ratios of catalytic systems. The thermal properties, mechanical properties and rheological behavior of linear PET-co-PDET-co-PEOTs were studied in detail. In particular, the branched PET-co-PDET-co-PEOT were afforded via introducing the multifunctional reagents, such as 1,1,1-tris(hydroxymethyl) ethane (TME), 2,2-dimethylolpropionic acid (DMPA) or 1,2,3-propanetricarboxylic acid (PTA). Compared to linear PET-co-PDET-co-PEOTs, the elongation at break of the branched PET-co-PDET-co-PEOTs were strongly enhanced to 409%, and their flow properties were accordingly altered, as revealed by rheological analysis. The novel PET-based poly(ether-ester)s will be promising as potential thermal elastomers.

Published
2021

2. The copolymerization of flexible poly(ethylene terephthalate)-poly(ethylene oxide terephthalate) poly(ether ester)s and brittle polylactic acid: Balanced mechanical properties and potential biodegradability.

Author

Gan, Ziyao, Feng, Yinbiao, Yang, Junjiao, Tan, Tianwei, and Yang, Jing

Subjects
*ETHYLENE oxide, *POLYLACTIC acid, *COPOLYMERIZATION, *DYNAMIC mechanical analysis, *GLASS transition temperature, *BIODEGRADABLE plastics
Abstract

The green sustainability of the plastic industry puts forward to unceasingly exploring new eco-friendly and adoptable polymers for meeting the requirement. Poly(ethylene terephthalate)-poly(ethylene oxide terephthalate) (PET-PEOT), one kind of poly(ether ester)s (PEEs) composed of soft PEOT segments and hard PET, is a nonbiodegradable polymer but shows attractive flexibility and ductility. Their distinctive properties are good complementary to biodegradable and brittle poly(lactic acid) (PLA). Therefore, in this study, PET-PEOT was copolymerized with PLA, and the effect of two copolymerization pathways (Pathway 1 and Pathway 2) on the chemical components and the sequence lengths of PET-PEOT and PLA segments in the resulting copolymers has been investigated in detail. It was found that the copolymers PET-PEOT-PLA fabricated via Pathway 2 of copolymerizing low molecular weight PET-PEOT with PLA by step-increasing temperatures are able to retain the average sequence lengths of PLA up to 16 in the resulting copolymers. Differential scanning calorimeter (DSC) and dynamic mechanical analysis (DMA) revealed that these copolymers PET-PEOT-PLAs had random segment distribution, and glass transition temperatures were monotonically decreased with increasing PET-PEOT contents. The initial decomposition temperatures of PET-PEOT-PLAs analyzed by thermogravimetric analysis were decreased with PLA content increasing. The mechanical properties and potential degradability of the copolymers have been significantly ameliorated. [Display omitted] • The copolymerization of PET-based poly(ether ester) with PLA for an exploitation of a novel biodegradable plastic. • Step-increasing temperature is a key to impact the average sequence lengths of the resulting segments. • The copolymers of PET-PEOT-PLA exhibited good mechanical properties and potential degradability. [ABSTRACT FROM AUTHOR]

Published
2022
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