Effects of Poly(cyclohexanedimethylene terephthalate) on Microstructures, Crystallization Behavior and Properties of the Poly(ester ether) Elastomers

Abstract

To understand the role of molecular structure on the crystallization behavior of copolyester in thermoplastic poly(ether ester) elastomers (TPEEs), series of poly(butylene-co-1,4-cyclohexanedimethylene terephthalate) (P(BT-co-CT))-b-poly(tetramethylene glycol) (PTMG) are synthesized through molten polycondensation process. The effects of poly(cyclohexanedimethylene terephthalate) (PCT) content on the copolymer are investigated by Fourier transform infrared spectroscopy (FT-IR), 1H and 13C nuclear magnetic resonance (NMR), gel permeation chromatographs (GPC), wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), mechanical, and visible light transmittance tests. FT-IR and NMR results confirm the incorporation of PCT onto the copolymer. WAXD and DSC indicate that the crystalline structure of the copolymers changed from α-PBT lattice to trans-PCT lattice when the molar fraction of PCT (MPCT) is above 30%, while both crystallization and melting temperatures reach the minima. An increase in MPCT led to an increase in the number sequence length of PCT, the thermal stability and the visible light transmittance of the copolymer, but to a slight decrease in tensile strength and elastic modulus.

Fabrication of Two Polyester Nanofiber Types Containing the Biobased Monomer Isosorbide: Poly (Ethylene Glycol 1,4-Cyclohexane Dimethylene Isosorbide Terephthalate) and Poly (1,4-Cyclohexane Dimethylene Isosorbide Terephthalate)

“…One of the most widely utilized polymers is poly (1,4-cyclohexanedimethylene terephthalate) (PCT), an aromatic semicrystalline polyester [ 15 ]. The cyclohexylene ring of CHDM flips from e,e- trans structure to a,a- trans at room temperature via twisted-boat conformation, enhancing chain mobility [ 16 ].…”

Acid and enzymatic extraction of collagen from Atlantic cod (Gadus Morhua) swim bladders envisaging health-related applications

“…They probably differ in several physicochemical properties, the molecular weight being one of them [40]. The GPC-RALS method allows the determination of the Number Average Molecular Weight (Mn) and Weight Average Molecular Weight (Mw), as well as the polydispersity (Mw/Mn) [41]. The Mn can be defined as Total mass of material divided by the total number of molecules, meanwhile the Mw can be described as the total mass of material multiplied by the molecules mass.…”

Structure–property relationship of poly(cyclohexane 1,4‐dimethylene terephthalate) modified with high trans‐1,4‐cyclohexanedimethanol and 2,6‐naphthalene dicarboxylicacid

“…The degree of crystallinity (X c ) of samples was calculated as follows: where ∆ H m (exp) is the experimentally determined melting enthalpy and ∆ H m (cal) is the melting enthalpy of 100% crystalline PCT, which is calculated by adopting a group contribution theory …”