Manipulating the Properties of Poly(1,4‐Cyclohexylenedimethylene Terephthalate) (PCT) Just by Tuning Steric Configuration of 1.4‐Cyclohexanedimethanol (CHDM)

Abstract

The properties of poly(1,4‐cyclohexylenedimethylene terephthalate) (PCT) are manipulated only by tuning the steric configuration of 1,4‐cyclohexanedimethanol (CHDM). The chemical structures and compositions of PCTs are confirmed by nuclear magnetic resonance (1H NMR and 13C NMR) before their thermal and mechanical properties are investigated by differential scanning calorimeter, thermogravimetric analyzer, and dynamic mechanical analysis. Results show that the ratio of cis‐ to trans‐CHDM in PCTs has significant influences on their properties. The melting temperature of PCTs is varied from 251 to 313 °C, and the glass transition temperature is increased from 73 to 92 °C when the content of trans‐CHDM in PCTs is increased from 10% to 96%. In addition, the crystallizability of PCT is also increased with the content of trans‐CHDM. However, its thermal stability is decreased seriously when the melting temperature of PCT is higher than 280 °C. It is concluded that when the content of trans‐CHDM is lower than 50% (PCT‐10, PCT‐28, and PCT‐46), the balance of melting temperature, glass transition temperature, and thermal stability for PCT can be achieved. Just by varying the cis/trans ratio of CHDM, rather than the addition of other components, the properties of PCT can be manipulated.

Semiaromatic Polyesters from a Rigid Diphenyl-Terephthalic Acid: From Synthesis to Properties

“…This implied that the crystallization of PD-10 was additionally caused by the stacking of the methylene segments of DDO. The two main reflections at 2θ values of 16.8 and 19.3° in the profile of PCD could also be found in the diffraction profile of PCT, indicating that PCD adopted the same crystallographic pattern as that of PCT . Peak deconvolution in the case of PD-2 showed the highest degree of crystallinity of 33.7%, among all of the DDB polyesters.…”

“…The two main reflections at 2θ values of 16.8 and 19.3°in the profile of PCD could also be found in the diffraction profile of PCT, indicating that PCD adopted the same crystallographic pattern as that of PCT. 52 Peak deconvolution in the case of PD-2 showed the highest degree of crystallinity of 33.7%, among all of the DDB polyesters. This result was as expected, considering the higher DDB density and the sufficient mobility of PD-2 chains.…”

Melt polycondensation of 2,5-tetrahydrofurandimethanol with various dicarboxylic acids towards a variety of biobased polyesters

“…The carbon residue of the homopolyesters containing aromatic rings was higher than that of the homopolyesters containing aliphatic acids and diols at 600 °C, which was commonly observed during the thermal degradation process of many polyesters containing aromatic rings. 52–55 The DTG curves of all homopolyesters presented a symmetrical single peak. The thermal decomposition temperature parameters are summarized in Table 4.…”