Polymers
·
2017
·Vol. 9
·期 9
·305
·
IF 3.364
Jinggang Wang,Xiaoqing Liu,Jin Zhu,Yanhua Jiang
Bio-based polyesters derived from 2,5-furandicarboxylic acid (FDCA), including poly (ethylene 2,5-furandicarboxylate) (PEF), poly(propylene 2,5-furandicarboxylate) (PPF), and poly(butylene 2,5-furandicarboxylate) (PBF) have been synthesized and modified with 2,2,4,4-tetramethyl-1,3-cyclobutanediol (CBDO). Copolyesters with increased glass transition temperature, good barrier and better mechanical properties, as well as higher transparency were reported in this work. The chemical structures, composition, and sequence distribution of the copolyesters were determined by1H NMR and13C NMR. The degree of random (R) was close to 1 for all the copolyesters, indicating their random chemical structures. With the introduction of 10% CBDO units, the semi-crystalline PEF and PPF were changed into completely amorphous polyesters and the higher transparency was easily achieved. The glass transition temperature was increased from 87 °C for PEF to 91.1 °C for PETF-18, from 55.5 °C for PPF to 63.5 °C for PPTF-18, and from 39.0 °C for PBF to 43.5 °C for PBTF-18. The barrier properties investigation demonstrated that although the O2and CO2barrier of PEF/PPF/PBF were decreased by the addition of CBDO units, the modified copolyesters still showed good barrier properties.Keywords:2,5-Furandicarboxylic acid (FDCA);poly (ethylene 2,5-furandicarboxylate) (PEF);poly(propylene 2,5-furandicarboxylate) (PPF);poly(butylene 2,5-furandicarboxylate) (PBF);2,2,4,4-tetramethyl-1,3-cyclobutanediol (CBDO)
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Yanru Chen,Linbo Wu,Bo-Geng Li
Poly(cyclohexane dimethylene-co-2,2,4,4-tetramethyl cyclobutylene terephthalate) (PCcBT) is a highly transparent, safe, and heat-resistant copolyester and has been commercialized to replace bisphenol A polycarbonate in many kinds of applications. However, there are still some shortcomings in its synthesis and processing such as 2,2,4,4-tetramethyl-1,3-cyclobutanediol (CBDO) sublimation, composition deviation, and relatively poor thermal stability. In this study, 2-methyl-1,3-propanediol (MPO) or 3-methyl-1,5-pentanediol (Pe′DO) were used as diol comonomers instead of cyclohexane dimethanol to synthesize poly(3-methyl-1,5-pentylene-co-2,2,4,4-tetramethyl cyclobutylene terephthalate) and poly(2-methyl-1,3-propylene-co-2,2,4,4-tetramethyl cyclobutylene terephthalate) (PMcBT) copolyesters. The effects of comonomers on solubility and sublimation of CBDO and the robustness of polymerization as well as thermal stability during polymerization and processing were examined with emphasis. The presence of Pe′DO and MPO facilitated CBDO dissolution and avoided CBDO sublimation and pipeline blocking, possibly due to a stronger intermolecular interaction between CBDO and Pe′DO or MPO. The deviations of composition and cis-trans ratio between the CBDO monomer and the copolymers were also reduced. The presence of a Pe′T or MT repeat unit endowed the copolymers with improved thermal stability, resulting in much less undesired melt foaming and volume expansion during melt polycondensation and processing. These copolymers are colorless, highly transparent, and heat-resistant materials with Tg up to 145 °C. Among them, PMcBT exhibits the best overall performance, displaying more balanced mechanical properties and better optical properties over commercialized PCcBT.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2024
·
IF 4.1
Liuchun Zheng,Xuedong Lv,Yongjun Zhang,Yi Liu
Due to the shortage of fossil resource and pollution problems caused by traditional non-degradable polymers, biodegradable polyesters attract increasing interest. Poly(butylene succinate) (PBS) has good biodegradation characteristics, relatively high melt temperature, excellent thermal stability and processing properties. However, its unique chemical structure renders it possesses relatively lower glass transition temperature ( T g ), insufficient mechanical properties. In this work, novel aliphatic cyclic rigid monomer (2,2,4,4-tetramethyl-1,3-cyclobutanediol (CBDO) was introduced into the macromolecular chain of PBS to improve the mechanical properties of PBS. The resulting copolyesters (PBCBS) show T g ranging from −34.7 to −25.6 °C. Tensile tests showed that theses polymers possess high tensile strength (44-29 MPa) and elongation at break as high as 450 %, which is prominently higher than that of commercial PBS and most biodegradable packaging materials. The novel copolyesters were studied by wide-angle X-ray diffraction analysis. It has been found that the introduction of CBDO reduces the crystallization ability of PBCBS and the main reason for this phenomenon is that the aliphatic ring restricts the mobility of macromolecular chains and regular stacking. As crystallinity is reduced, more water molecules can enter into the amorphous region, contact with the ester group bonds, and accelerate the degradation. In addition, the transparency at 700 nm for PBCBS can reach 95 % and it showed better solvent resistance as compared to polycarbonate. The biodegradable polyesters with satisfied combined performance were reported in this work.
研究领域:
材料科学
·
生物降解材料
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）