Environmentally Friendly Copolyesters Containing 1,4‐Cyclohexane Dicarboxylate Units, 1‐Relationships Between Chemical Structure and Thermal Properties

Abstract

Novel aliphatic, random copolyesters, containing co‐units derived from a poly(alkylene dicarboxylate) and a poly(butylene 1,4‐cyclohexanedicarboxylate), have been synthesized and characterized in terms of molecular structure and thermal properties. In particular, the effects of the molar composition, the length of the aliphatic sequences, and the cis/trans ratio of the 1,4‐cyclohexylene units on the characteristics of the crystalline and amorphous phases are discussed. Some interesting structure‐property relationships have been found. The materials result to be very promising new biopolymers as they are characterized by a potential biodegradability and good physical properties, which can be easily modified, according to the requests of specific applications, by little changes in the molecular structure.magnified image

Eco‐friendly Poly(butylene 1,4‐cyclohexanedicarboxylate): Relationships Between Stereochemistry and Crystallization Behavior

“…[3,4] The comparison between the glass transition temperatures of poly(butylene adipate) (PBA) and poly-(butylene 1,4-cyclohexanedicarboxylate) (PBCHD), whose chemical structure is reported in Scheme 1, can be significant. The T g values are -58 8C for PBA [5] and vary from -10 to 18 8C for PBCHD, [6] i.e., difference of about 50-80 8C. This is a clear indication of the high rigidity of PBCHD chains due to the presence of cyclic groups in the dicarbonyl units.…”

Synthesis of copolyesters with bio-based lauric diacid: structure and physico-mechanical studies

“…For PBLC-80, it is the orthorhombic type similar to that of PBL. 39 For the rst group, with increasing amount of BL unit, the intensity of the diffraction peaks becomes weak, and the peak at 2q ¼ 19.64 disappears. This observation is similar to what has been reported in a PBAC copolymer series.…”

“…36 Therefore, this result suggests that the crystalline phase in this group of PBLC copolyesters is the PBC crystalline phase. 39 Incorporation of BL unit hinders the crystallization of BC unit, and only small amount of BC unit is able to organize into crystalline phase.…”

Soft segment free thermoplastic polyester elastomers with high performance

“…[13][14][15][16][17][18][19] As for poly(butylene 1,4-cyclohexanedicarboxylate) (PBC), the cis-CHRM is rarely used. [20][21][22][23][24][25][26][27][28][29] Therefore, only the properties of PBC as a plastic are studied.…”