INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2018
·
IF 3.141
Han Hu,Ruoyu Zhang,Lei Shi,Wu Bin Ying,Jinggang Wang,Jin Zhu
Fully biobased poly(butylene 2,5-furandicarboxylate)-co-poly(lactic acid)s (PBFLAs) of lactic acid composition from 10% to 40% are synthesized. They are subjected to molecular, thermal, diffractometric, degradable and mechanical characterizations. Thermogravimetric analysis shows that PBFLA are thermally stable at least 350 °C, much higher than PLA. After the incorporation of lactic acid units, both Tm and crystallization rate decrease with respect to homopolymers. X-ray diffraction measurements indicate that no PLA crystal is present during crystallization. All samples perform better barrier properties with respect to PLA, implying potential application in packaging. These samples behave like semicrystalline plastic in the tensile tests. PBFLA copolyesters show Young’s modulus, maximum tensile strength and breakage elongation higher than 1000 MPa, 38 MPa, and 230%, respectively. Such comprehensive mechanical behaviors exceed most biodegradable materials. Lastly, biodegradability could be significantly improved when more than 20% of lactic acid units are introduced into homopolymers.
研究领域:
材料科学
·
生物工程
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产品关联
DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2020
·Vol. 61
·期 2
·379-387
·
IF 1.917
Jing Jing,Li Song,Tingting Su,Zhanyong Wang
In this study, various biodegradable materials, including poly(butylene succinate) (PBS), poly(hexamethylene succinate) (PHS), and poly(butylene succinate- co -hexamethylene succinate)s (P[BS- co -HS]s) containing different hexamethylene succinate (HS) contents, were prepared. The compositions, thermal properties, mechanical properties, hydrophilicity, and enzymatic hydrolyzability of the materials were investigated by various techniques. The results showed that the composition of the copolyesters was similar to the feeding ratio of the reactants. The melting and crystallization temperatures, thermal stability, and degree of crystallinity of the copolyesters decreased for low HS content and increased for high HS content. P(BS- co -HS)s containing 52 mol% HS exhibited low crystallization temperature ( T c ), melting temperature ( T m ), degree of crystallinity ( X c ), and high hydrophilicity, elongation at break and enzymatic hydrolyzability. We also observed that low degree of crystallinity and high crystal defects, hydrophilicity, and high elongation at break could improve the enzymatic hydrolyzability of the materials.
研究领域:
材料科学
·
生物降解材料
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2022
·Vol. 29
·期 2
·1-9
·
IF 3.061
Song Tao,Wang Qingyin,Li Jianguo,Chen Xuejun,Liu Shaoying,Wang Gongying
A new copolyesters of poly(2-[4-(2-hydroxyethoxy)phenoxy]ethyl-co-1,4-cyclohexylenedimethylene terephthalate) (PHCT) with different compositions were synthesized from terephthalic acid, 1,4-cyclohexanedimethanol and hydroquinone bis(2-hydroxyethyl) ether (HQEE) via esterification-polycondensation reaction. The synthesized copolyesters were analyzed by 1 H-NMR, FT-IR, GPC, intrinsic viscosity, DSC, TGA and tensile testing, respectively. The 1 H-NMR and FT-IR analysis confirm the successful introduction of HQEE into poly(1,4-cyclohexylenedimethylene terephthalate (PCT) chains. The introduction of HQEE into PCT chains can effectively lower the melting point of PCT, making it easier to process. The glass transition temperature of PHCT is higher than 70 ℃ and it has the comparable thermal stabilities to PCT. In addition, introducing HQEE into PCT chains can effectively improve the molecular weights of PCT, thus imparting PHCT with better mechanical performance relative to PCT. The PHCT is a tough polymer, which owns the higher Young’s modulus (above 300 MPa), the higher tensile strength (above 39 MPa) and the higher elongation at break (above 226%).
研究领域:
材料科学
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化学工程
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产品关联
DOI
高影响因子
ACS Omega
·
2025
·
IF 4.3
Xinpeng Zhang,Hongli Bian,Xiangze Meng,Jing Yuan,Jianping Ding,Wanli Li,Jun Xu,Baohua Guo
Poly(butylene adipate-co-terephthalate) (PBAT) is one of the most promising biodegradable copolyesters for addressing “white pollution” and has made significant progress in industrial production, particularly in packaging and mulching film applications. However, melt elasticity and the rapid biodegradation rate of linear PBAT limit the broader application. In this study, a series of novel PBAT copolyesters with a low content of branch units (1.3–1.6%) were synthesized from adipic acid (AA), terephthalic acid (PTA), 1,4-butanediol (1,4-BDO), and branching monomers with fixed side chain length through esterification and polycondensation. A comprehensive investigation into the macromolecular structure of branched PBAT was conducted. A “Memoryless Random Model” combined with 1H-NMR analysis was used to calculate the number-average sequence length, which proved the existence of random block sequences. Both linear and branched PBAT copolymers exhibited relatively high and similar molecular weights of 6.3 × 104 Da and above. The conformational parameters g and B3w were determined by gel permeation chromatography (GPC) coupled with triple detectors, thereby providing a clear definition of the branching characteristic. Fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), and X-ray diffraction (XRD) analyses revealed two crystalline forms in PBAT, with the β-form predominating in linear PBAT and a decrease in crystallinity in branched PBAT. The enzymatic hydrolysis experiment showed that the branched side chain reduced the hydrolysis rate, and the existence of consecutive sequences (≥3) was proved by LC–MS. The copolymers demonstrated higher complex viscosity and tanδ at the same frequency, indicating enhanced melt viscosity and elastic response. The deviation of the end slope in the Han curve also proved the existence of BA-BT random block sequence and complex relaxation behavior.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2021
·
IF 4.598
Ang Shen,Guohua Wang,Jinggang Wang,Xiaoqin Zhang,Xuan Fei,Lin Fan,Jin Zhu,Xiaoqing Liu
Poly(1,4-butylene- co -1,4-cyclohexanedimethylene 2,5-furandicarboxylate) (PBCFs) was synthesized from bio-based 2,5-furandicarboxylic acid (FDCA), 1,4-butanediol (BDO) and 1,4-cyclohexanedimethanol (CHDM). The GPC showed that the number average molecular weight ( M n ) of PBCFs were in the range of 38400–44200 g/mol and the average molecular weight ( M w ) varied from 83,000 to 94,800 g/mol with the polydispersity index of 2.22–2.33. The chemical structures, compositions and sequence distributions of PBCFs were confirmed by 1 H NMR and 13 C NMR. Their thermal properties and crystallization behavior were investigated by Differential Scanning Calorimeter (DSC). Results showed that the glass transition temperature ( T g ) and melting temperature ( T m ) of poly(butylene 2,5-furandicarboxylate) (PBF) were increased from 38 and 171.8 °C to 65.8 and 211.7 °C for PBCF-68, respectively. Furthermore, the strength and modulus were increased from 44 and 950 MPa for PBF to 69 and 1360 MPa for PBCF-68 with the mole percentage of CHDM units of 68% in diol units. PBCFs demonstrated much better thermo-mechanical properties when compared with those of PBF, which might be used as the bio-based engineering plastic or excellent packaging materials with high transparency and good gas barrier properties.
研究领域:
材料科学
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高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2024
·Vol. 31
·期 6
·1-14
·
IF 2.6
Jiang Jiacheng,He Zhen,Yin Wang,Chen Rui,He Jing,Lang Meidong
As a typical biodegradable material, poly(lactic acid) (PLA) has great development potential in fields such as packaging, textiles and biomedical applications due to its high modulus and strength as well as excellent biocompatibility. However, the inherent brittleness and poor toughness of PLA significantly limit its widespread application. In this study, a biodegradable aliphatic–aromatic copolyester called poly(ethylene adipate- co -terephthalate) (PEAT) was synthesized using the industrially well-established direct esterification method. PEAT demonstrated excellent flexibility and extremely high fracture elongation. Its fracture elongation exceeded 900%, making it a highly ductile material with exceptional toughness. Given the complementary nature of PLA and PEAT, blending PLA with PEAT becomes a natural choice for improving the performance of PLA. The influence of the addition of PEAT on the mechanical properties, thermal performance, crystallization, phase morphology and rheological behavior of the blends was thoroughly investigated. With the addition of PEAT, the fracture mode changed from brittle fracture of the neat PLA to ductile fracture of the blends as illustrated by tensile test. The best toughening effect on PLA was achieved at a PEAT content of 30 wt%, with the elongation at break increasing from 6.7% for neat PLA to 359% for the binary blend, an improvement of 53 times. Additionally, the impact strength also increased from 4.4 kJ/m 2 to 10.5 kJ/m 2 , an increase of 138%. DSC revealed that PEAT had a certain influence on the crystallization behavior of PLA. SEM showed that the PEAT toughening mechanism was primarily attributed to a shear yielding mechanism triggered by debonding cavitation.
研究领域:
材料科学
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生物医学工程
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2013
·Vol. 5
·期 7
·2382-2390
·
IF 5.231
Lei Wu,Junping Zhang,Bucheng Li,Aiqin Wang
A facile approach for preparing magnetically driven durable superhydrophobic polyester materials is developed by simply dip-coating in a nanocomposite solution. The nanocomposite is prepared by the polymerization of tetraethoxysilane and n-hexadecyltriethoxysilane in the presence of the Fe3O4 nanoparticles. The coated magnetic samples exhibit excellent superhydrophobicity, superoleophilicity, and mechanical and chemical stability, owing to the tight binding of the nanocomposite on the polyester materials and the inherent stability of the polymerized organosilanes. The superhydrophobic materials can quickly absorb petrol, diesel and crude oil, and show very high selectivity in oil/water separation. In addition, the superhydrophobic materials could maintain their superhydrophobicity, oil absorption capacity and oil/water selectivity after a large amount of mechanical damage, 90 days of immersion in oil and ten cycles of absorption–desorption. Moreover, the coated sample can be magnetically driven to the polluted water zone using a magnet. Also, the facile approach can be easily scaled up for producing samples on a large scale, which makes it very promising for practical oil absorption.
研究领域:
材料科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2023
·
IF 5.9
Pengfei Shan,Ming Zhang,Xiaoyue Lian,Weilin Lu,Xiangping Yin,Haiwei Liu,Yingwen Lu,Qi Yuxi,Jiabin Jiang,Zhihui Li,Zhongyu Li
The low utilization efficacy of conventional herbicide formulations greatly harms the environment and human health. Inspired by the fact that many drug delivery systems are designed to achieve targeted release triggered by the microenvironment of tumor tissues in cancer therapy, a tartaric acid-derived polyester with hydrophilic acid-degradable side chains was designed and synthesized for site-specific herbicide delivery by utilizing the acidic microenvironment in the rhizosphere . The amphiphilic polymer can spontaneously form polymeric micelles in the aqueous solution to load diuron. The diuron-loaded polymeric micelles can release diuron under acidic conditions, and the release rate increase with the reduction of pH value. The herbicidal effect of the diuron-loaded polymeric micelles is investigated using barnyard grass as the research object. The results reveal that the diuron-loaded polymeric micelles are able to kill barnyard grass effectively. Finally, the toxicity studies suggest that the polymer can mitigate toxicity to the non-target organisms. In view of its superior herbicidal activity, excellent biodegradability and biocompatibility, this site-specific herbicides release system has broad potential in agricultural applications.
研究领域:
植物学
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农业科学
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材料科学
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产品关联
DOI
高影响因子
Materials Today Communications
·
2024
·
IF 3.7
Jia Mi,Yingchun Li,Wensheng Wang,Zhimao Li,Tong Liu,Guang Nie,Zheyu Zhang
Bio-based copolyesters have garnered significant attention in the domains of packaging and agriculture due to their exceptional degradability and mechanical properties. Building upon existing research, this study further modifies bio-based copolyesters with the objective of enhancing their comprehensive mechanical properties and broadening their application scope. High-performance aromatic copolyesters were synthesized through a two-step esterification and polycondensation process, utilizing terephthalic acid, adipic acid, 1,4-butanediol, and erythritol as raw materials. The structures of the synthesized copolyesters were characterized using FTIR, 1 H NMR, 13 C NMR. Compared to PBAT, the tensile strength and elongation at break of the copolyesters demonstrated improvements of 22.14 % and 80.14 %, respectively. Moreover, the tear strength and puncture resistance of the copolyesters were enhanced by 25.10 % and 54.13 %, respectively. TG indicated that the copolyesters exhibit high thermal stability. Notably, these copolyesters maintained good degradability after 35 days at ambient temperature. In conclusion, the enhancement of both mechanical and degradation properties of copolyesters was imperative for the advancement and promotion of degradable foams, films, and elastomers.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2020
·
IF 10.652
Ji Mi,Shuaishuai Bai,Lu Zhao,Guijin He,Yongsheng Guo,Hujun Xie,Wenjun Fang
Active cooling of scramjets by endothermic hydrocarbon fuels is considered as an effective approach to addressing the thermal problem for hypersonic aircrafts. To accelerate the endothermic cracking reactions of these fuels for a better cooling capability, a strategy for hydrocarbon cracking using polymer-based macromolecular initiators has been proposed. To verify the universality of this strategy and also to enhance the solubility of macromolecular initiators, a novel polyester macromolecular initiator (MI) is designed. It is clarified that the MI features high-efficient thermal cracking of hydrocarbon fuels in a tubular reactor with an improved conversion ratio, gas yield, and alkene selectivity. The possible mechanism behind the macromolecular initiator is revealed on the basis of intermediate analyses and density functional theory (DFT) calculations, which show the radical fragments from MI decomposition are effective in accelerating JP-10 dehydrogenation. The successful implementation of polyester materials in hydrocarbon fuels holds immense promise for the optimal use of hydrocarbon fuels in hypersonic aircrafts.
研究领域:
航空工程
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
Polymer Chemistry
·
2019
·Vol. 10
·期 28
·3851-3858
·
IF 4.76
Jin'an Wu,Chunlai Ding,Dong Xing,Zhengbiao Zhang,Xiaofei Huang,Xiulin Zhu,Xiangqiang Pan,Jian Zhu
This paper describes a novel ε-caprolactone monomer modified by a phenylseleno group at the α-position of the carbonyl. Poly(α-phenylseleno caprolactone) (PCLSePh) with a well-controlled molecular weight and narrow molecular weight distribution (Đ < 1.20) was prepared through ring-opening polymerization. Hybrid polymers with properties superior to those of polyester materials were also prepared though selenide-mediated radical polymerizations under UV light irradiation. Subsequently, a carbon–carbon double bond was introduced into the main chain of the polymer by the oxidative elimination of the phenylseleno groups with high efficiency. Various side groups were further introduced into the polymer chain through a nucleophilic thiol–ene reaction. This strategy enables the synthesis of PCL with functional groups that allow the multifunctional integration of polyester materials. Furthermore, this monomer can be copolymerized with ε-caprolactone to form both random and block copolymers. The glass transition temperature, crystallinity and degradation rate of the copolymers can be adjusted both by oxidation and tuning the composition of the copolymer.
研究领域:
高分子化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2022
·
IF 5.546
Qianfeng Wang,Jinggang Wang,Yunxiao Dong,Xiaoqin Zhang,Han Hu,Lionel OYoung,Di Hu,Jin Zhu
Copolyesters based on 2,5-furandicarboxylic acid (FDCA) have attracted particular attention due to their outstanding gas barrier properties and biodegradability compared with commodity degradable polymers. This study provides the first comprehensive assessment of the effect of the segmental lengths of aliphatic diols on the properties of FDCA-based copolyesters. A series of poly(alkylene adipate- co -furanoate) (PAAF) copolyesters comprised of different aliphatic diols were prepared via melt polycondensation reaction and their comprehensive properties, including thermal properties, mechanical properties, gas barrier properties, degradability, and antibacterial activities were thoroughly investigated. NMR and GPC results confirm the successful synthesis of high-molecular-weight random copolyesters (their M w varies from 67,500 to 126,500 g·mol −1 ). The glass transition temperatures ( T g ) of PAAFs decreases with increasing diol segmental lengths whereas a zig-zag variation in the melting temperatures ( T m ) is observed due to the odd–even effect. All PAAFs exhibit good ductility and excellent mechanical properties with tensile moduli between 27 and 102 MPa. The gas barrier performances of PAAFs are 2.1 to 13.4 folds for O 2 and 2.4 to 13.6 folds for CO 2 better than those of poly(butylene adipate- co -terephthalate) (PBAT), respectively. All PAAFs can be rapidly biodegraded within 25 days under enzymatic hydrolysis conditions.
研究领域:
材料科学
·
环境科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）