Influence of asymmetric substituent group 2-methyl-1, 3-propanediol on bio-based poly(propylene furandicarboxylate) copolyesters. Issue 2 (2nd December 2019)

• Record Type: Journal Article
• Authors: Yang, Zhi-Yu; Chen, Chin-Wen; Rwei, Syang-Peng
• Is Part Of: Soft matter. Volume 16:Issue 2(2019)
• Page Start: 402
• Page End: 410
• Publication Date: 2019-12-02
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/c9sm02081k
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : The effect of the pendant methyl group weakens gas barrier properties owing to small-scale molecular motion and an increase of free volume. These novel copolyesters have great potential for packing-related applications. Abstract : A series of bio-based poly(propylene- co -2-methyl-1, 3-propanediol 2, 5-furandicarboxylate) (PPMF) copolyesters, with various compositions from poly(propylene 2, 5-furandicarboxylate) (PPF) to poly(2-methyl-1, 3-propylene 2, 5-furandicarboxylate) (PMePF), were synthesized by conventional melt polymerization. The effects of the substituent group to PPF on the thermal properties, mechanical properties, and gas barrier properties were analyzed by differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamic mechanical analysis (DMA), tensile testing, and the oxygen permeation test. The introduction of the methyl group with a hydrogen atom altered the thermal behavior and gas barrier properties of copolyesters, suggesting that the glass temperature ( T g ) and the melting temperature ( T m ) were decreased as the 2-methyl-1, 3-propanediol (MPO) content increased. PPF exhibited the highest T m and T g of 175.9 °C and 83.0 °C with a melting enthalpy (Δ H m ) of 38.6 J g −1, and poly(2-methyl-1, 3-propylene 2, 5-furandicarboxylate) formed as an amorphous polyester. Moreover, the effect of a substituent methyl group on the barrier properties was attributed to β relaxation and fraction free volume, which could be raised by replacing the methyl group with a hydrogen atom for PPF, weakening the barrier properties.