JOURNAL OF HAZARDOUS MATERIALS
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2023
·
IF 13.6
Qingyang Luan,Han Hu,Xiaoyu Jiang,Chen Lin,Xiaoqin Zhang,Qianfeng Wang,Yunxiao Dong,Jinggang Wang,Jin Zhu
Marine plastic pollution , with annual emissions into the marine over 53 million metric tons, has been a major worldwide concern. Many of so-called “biodegradable” polymers degrade very slowly in seawater. Oxalate have attracted attention because the electron-withdrawing effect of adjacent ester bonds promotes their natural hydrolysis, particularly in the ocean. However, the low boiling point and poor thermal stability of oxalic acids severely limits their applications. The successful synthesis of light-colored poly(butylene oxalate-co-succinate) (PBOS), with weight average molecular weight higher than 1 × 10 5 g/mol, displays the breakthroughs in the melt polycondensation of oxalic acid-based copolyesters. The copolymerization of oxalic acid retains the crystallization rate of PBS, with minimum half-crystallization times from 16 s (PBO 10 S) to 48 s (PBO 30 S). PBO 10 S-PBO 40 S exhibit good mechanical properties with elastic modulus of 218–454 MPa, and tensile strength between 12 and 29 MPa, better than packaging materials such as biodegradable PBAT and non-degradable LLDPE . PBOS achieve rapid degradation in the marine environment, with a mass loss 8%− 45% after 35 days. The characterization of structural changes demonstrate that the introduced oxalic acid plays a key role in the process of seawater degradation. This new class of polymers therefore provide highly promising materials for sustainable packaging with unique seawater degradation properties.
研究领域:
材料科学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
Polymer Chemistry
·
2017
·Vol. 8
·期 45
·7009-7016
·
IF 5.375
Shi-He Luo,Yan-Cheng Wu,Liang Cao,Qun-Fang Wang,Shui-Xia Chen,Zhi-Feng Hao,Le Jing,Zhao-Yang Wang
A series of polylactic acid-ibuprofen (PLA-IBU) conjugates was directly synthesized via melt polycondensation of lactic acid (LA) with ibuprofen (IBU) in the presence of 0.3 wt% SnO at 160 °C for 6 h. The structures of the PLA-IBU conjugates were confirmed by FTIR and 1H NMR. According to the GPC and DSC results, the molecular weight and Tg of the PLA-IBUs with different feed ratios increase as the feed amount of LA increases. The drug content of these IBU-conjugated biodegradable polymers can also be simply controlled by adjusting the monomer feed ratio to reach the expected levels. The preliminary biological tests show that the PLA-IBU conjugates have the anticipated pharmaceutical activity, which is beneficial for these PLA-based IBU prodrugs prepared by this convenient one-pot method to be efficiently used in the biochemical and pharmaceutical industry.
研究领域:
材料科学
·
药学
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 28
·e52513
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IF 3.057
Chenxi Lin,Kangzhou Xie,Donglin Tang
Polyureas (PUrs) with excellent properties have been applied widely in many fields. These days attention has been turned to non-isocyanate routes for PUr preparation due to the toxicity and the high cost of isocyanates. Urea is a green chemcial which can be either from urine or from recycled carbon dioxide and ammonia. Here we introduce a urea-based route to prepare PUrs, by melt polycondensation of urea and 1,10-diaminodecane (DA-10) or/and 1,6-diaminohexane (DA-6) without catalyst, solvent, and high pressure. It is difficult to synthesize such thermoplastic PUrs from diisocyanate without any solvent since the melting point of PUr is normally higher than 170°C at which isocyanate is able to react with urea group to form biuret. The thermoplastic PUrs obtained in this study exhibit excellent mechanical and thermal properties. Furthermore, the properties can be adjusted by changing the feed ratio of diamines (DA-6/DA-10). The compression-molded PUrs show even better mechanical properties than ultra-high molecular weight polyethylene (UHMWPE). The values of Young's modulus, strength at break and elongation at break are found to be 230–300 MPa, 40–60 MPa and 200%–400%, respectively (except for PUr-6). Therefore, this facile, non-isocyanate approach provides a viable alternative to the current industrial process for high-performance PUrs.
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
Polymers
·
2021
·Vol. 13
·期 16
·2660
·
IF 4.329
Zibo Zhou,Guozhang Wu
This study aimed to improve polydimethylsiloxane (PDMS) conversion in the preparation of polycarbonate (PC)–polydimethylsiloxane (PDMS) copolymer through melt polycondensation. We examined the transesterification process of PDMS with diphenyl carbonate (DPC) and its copolymerization products with bisphenol-A (BPA) for different chain lengths of PDMS. The key factors affecting PDMS conversion were investigated. Results showed that long-chain PDMS required a higher critical transesterification level (38.6%) to improve miscibility with DPC. During polycondensation, side reactions were more prone to occur when the equilibrium transesterification level of long-chain PDMS was lower. PDMS conversion was also lower when more short-chain PDMS was fed. Increasing the chain length of PDMS also reduced PDMS conversion. Notably, increasing the amount of KOH can significantly improve PDMS conversion throughout the polycondensation stage by increasing the equilibrium transesterification level of long-chain PDMS, thereby inhibiting the occurrence of side reactions.Keywords:PC-PDMS copolymer;melt polycondensation;miscibility;equilibrium transesterification level;conversion
研究领域:
材料科学
·
聚合物化学
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DOI
PubMed
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2025
·Vol. 40
·期 2
·582-588
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IF 1.1
Zhang Mengyi,Cheng Zhengzai,Yang Mian,Yu Qianwen,Tan Zhiping,Wandji Djouonkep Lesly Dasilva,Cheng Junpeng,Liu Panpan,Ding Ling,Gauthier Mario
High molecular weight poly(1,4-butylene 2,5-furandicarboxylate-co-isosorbide 2,5-furandicarboxylate) copolyesters (PBSIF- x ) were synthesized via melt-polycondensation of 2,5-furandicarboxylic acid (FDCA), with varying ratios of isosorbide (ISB) and 1,4-butylene glycol (BDO) catalyzed by antimony trioxide (Sb 2 O 3 ). The PBSIF -x structures were investigated using FTIR and 1 H NMR, while the GPC analysis exhibited the copolyesters molecular weights with number average molecular mass ( M n ) in the range of 11 079–15 153 g/mol. The DSC results show that PBSIF- x copolyesters have a single glass-transition temperature ( T g ) (77.45–110.96 °C), increasing with the increase in ISB content, while TGA analysis demonstrates excellent thermal stability up to 320 °C. From the thermal result, properties of PBSIF- x copolyesters are found to be within the interval of their parent homologues poly(butylene 2,5-furandicarboxylate) (PBF) and poly(isosorbide 2,5-furandicarboxylate) (PIF), which confirms the aromatic/aliphatic blending within the polymer matrix for enhanced polymer stability and performance.
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
HIGH PERFORMANCE POLYMERS
·
2023
·
IF 2.1
Huanhuan Gao,Xiaozhou Zhang,Xigao Jian,Jinyan Wang
In this study, the melt polycondensation reaction of 9,9’- bis(4-hydroxyphenyl)fluoride (BHPF) and diphenyl carbonate (DPC) was catalyzed using three ionic liquids (ILs) and a conventional alkali metal as catalysts. The optimal IL catalysts were determined to be [BMmim][BF4] ionic liquid catalysts, and the catalytic mechanism was investigated. Furthermore, the optimum process conditions were identified: the optimal amount of [BMmim][BF4] was 0.05 mol% based on DPC, the polycondensation temperature was set at 200°C for a duration of 3 h, followed by polymerization at 280°C for another 3 h. As a result, the Mn value of poly(9,9-bis(4-hydroxyphenyl) carbonate) (PFC) reached up to 41387 g/mol with a glass transition temperature band of approximately 254°C and Td-5% value of around 436°C.
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 130
·期 2
·1415-1420
·
IF 1.395
Zuolong Yu,Jiadong Zhou,Fei Cao,Binbin Wen,Xuan Zhu,Ping Wei
Poly(ethylene 2,5-furandicarboxylate- co -ethylene succinate) (PEFS) copolymers of 2,5-furandicarboxylic acid (FDCA) and succinic acid with 11.98–91.32 mol % FDCA composition were synthesized via melt polycondensation in the presence of ethylene glycol using tetrabutyl titanate as a catalyst. PEFSs' molecular weight, thermal properties, and molar composition were determined by Fourier transform infrared spectroscopy, gel permeation chromatography, intrinsic viscosity, 1 H NMR, differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and wide-angle X-ray diffraction (WAXD) measurements. From experimental conditions, we obtained random copolymers with number-average molecular weights exceeding 25,600, determined by GPC and 1 H NMR analyses. DSC analysis revealed that PEFS copolymers' melting temperatures differed depending on EF units' percentage. TGA studies confirmed that all PEFS copolymers' thermal stability exceeded 300°C. From WAXD analysis, it is observed that the PEFS copolymer crystal structure was similar to that of PES when EF unit was 11.98 mol % and to that of PEF when EF units were 74.35 and 91.32 mol %. These results benefit this novel biodegradable copolymer to be used as a potential biomaterial. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 1415-1420, 2013
研究领域:
材料科学
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化学工程
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DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·Vol. 31
·期 11
·4990-5002
·
IF 5.3
Wang Guoqiang,Hao Xingyu,Dong Yakun,Zhang Li
Bio-based poly(butylene succinate-co-dodecylene succinate) (PBDSs) were successfully synthesized by adjusting the content of 1,12-dodecanediol (DD) using melt polycondensation method. The chemical structure, thermal behavior, crystallization properties, mechanical properties, and rheological properties were characterized. FTIR, 1 H NMR, and 13 C NMR showed the successful synthesis of polymers with the expected structure. The synthesized polymers have high number-average molecular weight (32500–64200 g/mol). The copolyesters were random copolymers. The relationship between melting temperatures and composition was basically V-shaped distribution, which is a typical characteristic of isodimorphism behavior. Thermogravimetric analysis (TGA) showed that the thermal stability of the synthesized copolyesters was good, with no significant weight loss until 320 °C. The synthesized polymers were all semi-crystalline polymers. When the amount of dodecylene succinate unit in the product is 80%, the copolyester has good mechanical properties (tensile strength: 34.5 MPa, elongation at break: 3489%) and processing properties, so it may be more suitable for making films.
研究领域:
材料科学
·
高分子化学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2012
·Vol. 125
·期 4
·3092-3099
·
IF 1.289
Suwen Ye,Licheng Tan,Yiwang Chen,Junchao Wei,Weihua Zhou
A series of aliphatic biodegradable poly(butylene succinate)- co -oligo( L -valine) (PBSVAL) copolyesters were synthesized with dimethyl succinate, 1,4-butanediol (BDO), and oligo( L -valine) (OVL) as reagents. The GPC results show that the weight average molecular weight ( M w ) of the copolyester with a feed ratio (PBS/OVL) of 0.9/0.1 (PBSVAL 10 ) is 4.9 × 10 4 g/mol, and its polydispersity index is 1.68. All the copolyesters were more thermally stable than the pristine poly(butylene succinate) (PBS). The incorporation of valine units into the copolyesters eventually led to the decrease of the crystallization temperature, melting temperature, while increase of crystallization enthalpy and melting enthalpy. The crystal structure of the copolyesters is similar to pure PBS except for higher degrees of crystallinity; also there was a trend to higher degrees of crystallinity with increasing content of valine. From the enzymatic degradation experiment, it is clear that the PBSVAL 10 copolyester shows less weight loss as compared to pure PBS which is due to PBSVAL 10 with higher degree of crystallinity. The morphology of the copolyester films after degradation was also studied by the scanning electron microscopy. © 2012 Wiley Periodicals, Inc. J Appl Polym Sci, 2012
研究领域:
材料科学
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生物医学工程
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DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 132
·期 13
·
IF 1.64
Shiquan Lai,Yan Gao,Li Yue
An attapulgite-supported Sn catalyst (Sn-palgorskite) was successfully prepared by ion-exchange co-impregnation method. The catalytic effect of Sn-attapulgite on the melt polycondensation reaction of poly(butylene succinate) (PBS) was examined by comparing with that of anhydrous SnCl 2 and a blank experiment. The structures and properties of the PBS products synthesized with the three catalytic systems were characterized by means of Fourier transform-infrared spectra (FT-IR), viscosity measurements, wide angle X-ray diffraction (WARD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Meanwhile, the acidolysis degradation behaviors of the PBS samples were also studied. It was found that the intrinsic viscosities and the number-average molecular weights of the PBS were remarkably increased under the catalysis of Sn-attapulgite, further leading to an increase in the decomposition temperature, the crystallization temperature, and the viscous flow activation energy, while a decrease in the melting temperature, the relative degree of crystallinity, and the rate of degradation. Additionally, no significant differences were observed in the crystal structures of all the samples, regardless of the reaction system with or without catalyst. The experiment results confirmed that Sn-attapulgite was an effective heterogeneous catalyst for the synthesis of PBS, and the recycled Sn-attapulgite still exhibited higher activity than anhydrous SnCl 2 under identical reaction conditions. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015 , 132 , 41729.
研究领域:
材料科学
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催化化学
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产品关联
DOI
高影响因子
JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·Vol. 31
·期 11
·4770-4783
·
IF 5.3
Wang Guoqiang,Wang Jianyu
In this work, the melt polycondensation method was used to synthesize aliphatic polyesters from 1,12-dodecanediol and aliphatic diacids with even carbon atoms. Gel permeation chromatography, hydrogen-1 nuclear magnetic resonance ( 1 H NMR), infrared spectroscopy, differential scanning calorimetry, wide-angle X-ray diffraction, thermogravimetric analysis, tensile test, dynamic mechanical analysis, and rotational rheometer were used for characterization. All polyesters had high weight average molecular weight (> 60,000 g/mol). Poly(1,12-dodecylene adipate) had the lowest weight average molecular weight (66,360 g/mol) and poor thermal stability. Four polyesters had very flexible molecular chains and shared a crystalline structure with polyethylene. Poly(1,12-dodecylene octanedioate) and poly(1,12-dodecylene sebacate) had tensile strength of 20.8 MPa and 25.3 MPa, respectively, and elongation at break of 255% and 254%, respectively, meaning that their tensile properties were similar to those of polyethylene.
研究领域:
材料科学
·
高分子化学
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DOI
高影响因子
JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 2
·467-473
·
IF 1.6
Sun Xin,Cheng Zhengzai,Djouonkep Lesly Dasilva Wandji,Lan Chupeng,Jia Ruyan,Zeng Sheng,Cheng Junpeng,Tang Ran,Li Yi,Yuan Beibei,Gauthier Mario
Six novel hydrolytically degradable polyesters were synthesized from thiodipropionic acid (TDPA) and five diols by melt polycondensation, and characterized by FT-IR, 1 H NMR, gel permeation chromatography, differential scanning calorimetry and thermogravimetry analysis. The polystyrene-equivalent number-average ( M n ) and weight-average molecular weight ( M w ) of these polyesters ranged from 4 900–11 100 Da and 7 900–20 879 Da, respectively, with PDI values of 1.48–1.98. The melting point varied from 62.3–127.9°C, and the 50% mass-loss temperature ranged between 387–417°C. The degradation of these polyesters was studied in terms of relative weight loss in distilled water at different pH. Weight losses of 14%–26% were obtained at pH 7.0, 26%–38% at pH 6.0, and 32%–43% at pH 8.3 over a 20-week period. The ecotoxicity study suggested that safety of the synthesized polyesters for the eisenia foetida. These results indicate that these polyesters have a combination of good thermal and degradability behaviors, which can be tailored through selection of the diol monomers used in the synthesis.
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
危险品化学品经营许可证（带存储）