INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
·
2023
·Vol. 24
·期 7
·6451
·
IF 5.6
Yanning Wang,Boyou Hou,Liping Huang,Bingjian Li,Shi Liu,Mingyang He,Qun Chen,Jinchun Li
At present, the development and usage of degradable plastics instead of traditional plastics is an effective way to solve the pollution of marine microplastics. Poly (butylene adipate-co-terephthalate) (PBAT) is known as one of the most promising biodegradable materials. Nevertheless, the degradation rate of PBAT in water environment is slow. In this work, we successfully prepared four kinds of high molecular weight polyester copolyesters (PBATGA) via quaternary copolymerization. The results showed that the intrinsic viscosity of PBATGA copolymers ranged from 0.74 to 1.01 dL/g with a glycolic acid content of 0–40%. PBATGA copolymers had excellent flexibility and thermal stability. The tensile strength was 5~40 MPa, the elongation at break was greater than 460%, especially the elongation at break of PBATGA10 at 1235%, and the thermal decomposition temperature of PBATGA copolyesters was higher than 375 °C. It was found that PBATGA copolyester had a faster hydrolysis rate than PBAT, and the weight loss of PBATGA copolymers showed a tendency of pH = 12 > Lipase ≈ pH = 7 > pH = 2. The quaternary polymerization of PBAT will have the advantage of achieving industrialization, unlike the previous polymerization process. In addition, the polymerization of PBATGA copolyesters not only utilizes the by-products of the coal chemical industry, but also it can be promising in the production of biodegradable packaging to reduce marine plastic pollution.Keywords:methyl glycoacetate;glycolic acid;biodegradable;hydrolysis
研究领域:
材料科学
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环境科学
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产品关联
DOI
PubMed
高影响因子
CRYSTENGCOMM
·
2015
·Vol. 17
·期 15
·2940-2948
·
IF 4.034
Changchao Jia,Ping Yang,Hsueh-Shih Chen,Junpeng Wang
Monodispersed mesoporous anatase titania (TiO2) hollow microspheres with controllable morphology and size are prepared via thioglycolic acid (TGA) chemically induced self-assembly for the first time. The formation process of TiO2 hollow spheres consists of three steps: hydrolysis of titanium butoxide (TBT) forming Ti-oxo clusters followed by connecting TGA via hydrogen bonding, assembly of the Ti-oxo clusters to solid spheres, and transformation of the TiO2 solid spheres into hollow spheres through the synergistic effect of thermodynamic (Ostwald ripening process) and kinetic (gas release) factors. TGA molecules firstly provide acidic conditions slowing down the hydrolysis rate of TBT, then control the formation of solid spheres, and finally create hollow structures. The prepared TiO2 hollow sphere with mesoporous structure has a large specific surface area (292.20 m2 g−1). Photocatalytic degradation of methyl orange (MO) by the TiO2 hollow spheres after reflux treatment improves significantly, owing to removal of TGA molecules from the TiO2 hollow spheres. Moreover, photocatalytic water splitting of highly crystalline TiO2 hollow spheres decorated with Pt nanoparticles exhibits an impressive performance for producing H2 (0.477 mmol h−1).
研究领域:
材料科学
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Analysis and Testing
·
2017
·Vol. 1
·期 4
·291-297
·
IF 0
Majeed Saadat,Gao Wenyue,Lai Jianping,Wang Chao,Li Jianping,Liu Zhongyuan,Xu Guobao
Abstract Most luminescent glucose sensors based on the interaction of glucose with organic boric acids or borates. Herein, a new luminescent glucose sensor is designed using thioglycolic acid-capped CdTe quantum dots in the presence of cheap inorganic boric acid. Both peak position and intensities change upon the addition of glucose because of the interaction of boric acid with glucose and thioglycolic acid-capped CdTe quantum dots, which enables glucose detection by either color change or intensity change. The luminescent intensities change linearly with glucose concentrations in the ranges from 0.03 to 1 mM and 1–25 mM with a detection limit of 10 µM ( S / N = 3). Moreover, glucose concentrations can be conveniently detected by color change in the range from 1 mM–25 mM. It displays a highly selective response to glucose over other interfering but biologically important saccharides, amino acids, and common ions. Graphical Abstract A thioglycolic acid-capped CdTe QD-based sensor can detect glucose with wide linear range by change in intensity or color in the presence of cheap inorganic boric acid.
研究领域:
生物化学
·
分析化学
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产品关联
DOI
JOURNAL OF POLYMER SCIENCE
·
2020
·Vol. 58
·期 6
·903-913
·
IF 0
Haicun Yang,Zinan Cai,Haotian Liu,Zheng Cao,Yanping Xia,Wenzhong Ma,Fanghong Gong,Guoliang Tao,Chunlin Liu
In this work, the compatibilization effects of hybrid maleated POE/attapulgite hybrid compatibilizer (M-POE/ATP) on the immiscible polypropylene/poly(glycolic acid) (PP/PGA) blends was investigated. The hybrid compatibilizer integrating strengthening, toughening and compatibilization functions was prepared via one-step reactive extrusion using peroxidated ATP as the initiator. Then, the effects of compatibilizer dosage on the mechanical, thermal, rheological and morphological characteristics of blends were evaluated in detail. It was found that the hybrid compatibilizer resulted in the significantly enhanced compatibility and mechanical performance. Increased amount of compatibilizer content fractionated and almost wholly suppressed the crystallization process of PGA. The compatibilized blends showed higher thermal stability than pure PGA, and lower storage modulus and complex viscosity at higher shearing frequency. PGA in the blends presented a much lower degradation rate, which lead to the higher strength retention of 81% for the blend with 4 wt% of compatibilizer in buffer solution after 35 days. Graphical The maleated POE/attapulgite (M-POE/ATP) hybrid compatibilizer was prepared via one-step reactive extrusion using peroxidated ATP as the initiator to compatilize the immiscible polypropylene/poly(glycolic acid) (PP/PGA) blends. The effective integration of strengthening, toughening, and compatibilization functions for this compatibilizer was confirmed by the enhanced mechanical performance, improved compatibility and the transform of fractured surface morphology of blends in the presence of M-POE/ATP.
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
FIBERS AND POLYMERS
·
2018
·Vol. 19
·期 11
·2307-2316
·
IF 1.353
Xu Qingbo,Ke Xiating,Zhang Yanyan,Fu Feiya,Liu Xiangdong
In this study, durable antibacterial cotton fabrics were prepared by a simple two-step impregnation method. Firstly, thioglycolic acid (TGA) was grafted onto cotton fabric via esterification with the hydroxyl groups of cellulose, then silver nanoparticles (Ag NPs) were immobilized on the cotton fabric surface via coordination bonds with the TGA thiol groups. As a result, the mean size of Ag NPs coating on the cotton fabric is around 74 nm, and these functionalized cotton fabrics show superior antibacterial properties and excellent laundering durability. After withstand 50 laundering cycles, the obtained cotton fabrics still showed outstanding bacterial reduction rates (BR) against both S. aureus and E. coli , and the rates are all higher than 97 %. Therefore, this method to prepare antibacterial cotton fabric shows great potential applications in socks, cosmetic, and medical textiles.
研究领域:
材料科学
·
微生物学
·
纺织工程
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产品关联
DOI
高影响因子
JOURNAL OF POLYMER RESEARCH
·
2012
·Vol. 19
·期 12
·1-8
·
IF 1.733
Ma Chi,Wang Bing,Xiong Cheng-Dong,Chen Dong-Liang,Xiong Zuo-Chun
Control of dimensional stability is crucial for using electrospun membranes in biomedical and tissue engineering applications. In this study, the contraction of electrospun membranes of poly( l -lactide-co-glycolide) (PLLGA) after stretch was investigated. Then, by adding PLLGA-b-polyethylene glycol (PLLGA-PEG), the contraction of the membranes was controlled. In addition, the mechanical properties of the membranes were investigated. On the basis of the strain–stress behavior of the membranes, an elongation of 50 % was used to investigate the orientation degrees of the membrane fibers. On the basis of the morphology of the stretched membranes, the contraction was found to depend on the orientation degree of fibers after stretch. A linear relationship between the contraction and degree of orientation after stretch was confirmed. Two-dimensional fast Fourier transform (2D FFT) analysis of the scanning electron microscopy (SEM) images of the membranes was used to quantify the orientation degree. It was surmised that the different orientation degrees were responsible for the different morphologies and thermal behaviors of the membranes.
研究领域:
生物医学工程
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组织工程
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 16
·3759
·
IF 4.2
Yachun Zhang,Junyang Chen,Jianhua He,Shuofan Li,Yuanfeng Wang,Yahe Zhang,Quan Shi
Polyglycolic acid (PGA) is a biologically friendly material with a wide range of applications. The production of dimethyl oxalate using coal-based syngas and the hydrogenation of dimethyl oxalate can produce the polymerization raw material of PGA, glycolide, which requires a methyl glycolate polymerization and depolymerization process. The intermediate products of the production process were analyzed using gas chromatogram-mass spectrometry (GC-MS) and Orbitrap mass spectrometry (Orbitrap MS), which revealed the presence of cyclic and linear PGAs with different capped ends. The impurities present in the oligomer were mostly methyl-capped PGA and were retained in the subsequent depolymerization process to glycolide, solvent washing can be used to remove this part of the impurity and ultimately obtain a refined glycolide product. Furthermore, it is proposed that the use of the specialized Kendrick Mass Defect (KMD) to plot and analyze PGA compounds obtained using mass spectrometry can enable the direct classification of PGAs without the need for exact molecular formula assignment.
研究领域:
化学工程
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材料科学
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分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Pei Zhang,Rulin Yang,Yuzhu Wang,Hongguang Sun,Guangqiang Xu,Qinggang Wang
The chemical recycling of plastics to monomers provides efficient assistance for sustainable development of plastics. For polyglycolide (PGA), it has gained widespread attention to be a highly promising plastic material due to its excellent performance. However, research on the ring-closing depolymerization of PGA has yet to break through. The depolymerization is mainly limited by the challenges brought by high crystallinity and melting point of PGA, and instability of glycolide (GL). In this work, a synergistic transesterification strategy is proposed to achieve efficient depolymerization of PGA to monomer GL. Utilizing the versatile catalyst zinc bis[bis(trimethylsilyl)amide] (Zn(HMDS)2) to promote simultaneous intramolecular and intermolecular transesterification, the random chain scission and back-biting depolymerization is achieved in succession. Therefore, the depolymerization product GL can be obtained in high yield and purity. This strategy will provide new research ideas for the chemical recycling of plastics.
研究领域:
材料科学
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化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
THERMOCHIMICA ACTA
·
2024
·
IF 3.1
Haoting Yin,Cong Chen,Tianyu Wu,Xiaoyu Meng,Hai-Mu Ye
The crystallization behavior and miscibility of blends between poly(glycolic acid) (PGA) and minority poly(vinyl alcohol) (PVA) with different saponification degrees have been studied. It was found that the melting point and crystallization ability of PGA in blends were remarkably depressed. During isothermal crystallization, introduction of PVA led to a decrease in both the Avrami index and the crystallization rate of PGA. The observation of spherulite morphology further revealed that the addition of PVA inhibited the growth of PGA spherulites, but increased the density of nucleation. Besides, PVA1788 with lower saponification degree displayed a stronger impact than PVA1799 on the crystallization of PGA. All blends exhibited a single composition-dependent glass transition temperature ( T g ), characteristic of miscible systems. The T g s fitted the Kwei equation well, and the calculated interaction parameters demonstrated the formation of intermolecular interactions between PGA and PVA and revealed the stronger interactions presenting in PGA/PVA1788 blends. FTIR investigation directly confirmed the effect of PVA on the carbonyl groups of PGA and PVA1788 played more roles than PVA1799. The interactions mainly form between carbonyl groups in PGA and hydroxyl groups in PVA1799, while latter ones change to carbonyl and hydroxyl groups in PVA1788.
研究领域:
材料科学
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高分子化学
✓ 已验证
产品关联
DOI
高影响因子
RESEARCH ON CHEMICAL INTERMEDIATES
·
2025
·
IF 3.5
Li Zhen,Guo Guizhang,Yu Zhou,Ma Zengyue,Yu Libo
In the pursuit of highly efficient hydrogen production through photoelectrochemical water splitting, expanding the utilization of the visible spectrum and extending the lifetime of photogenerated electrons are crucial challenges for improving the efficiency. To address these challenges, we prepared CdS sensitized TiO 2 photoanodes using a one-step hydrothermal method, employing thioglycolic acid (TGA) and mercaptopropionic acid (MPA) as linkers. The successful synthesis of CdS QDs and the CdS/TiO 2 photoanode was confirmed through various characterization techniques, including transmission electron microscopy (TEM), X-ray diffraction, and scanning electron microscopy. Performance evaluations revealed that the TGA-decorated CdS/TiO 2 photoanode exhibited superior photocurrent density and stability compared to the MPA-modified counterpart. Notably, its applied bias photo-to-current conversion efficiency was 1.7 times greater than that of the MPA-modified CdS/TiO 2 photoanode. Furthermore, UV–visible absorption spectrum analysis demonstrated that the incorporation of CdS QDs significantly broadened the spectral response of the TiO 2 photoanode, extending it from the ultraviolet to the visible range. This enhancement is crucial for improving light harvesting capabilities. Additionally, our analysis of electron lifetime indicated that the shorter molecular chains of TGA effectively minimize the transfer distance for photogenerated electrons from the CdS QDs to the TiO 2 , resulting in improved electron lifetimes and, consequently, enhanced photocurrent density.
研究领域:
材料科学
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能源科学
·
光电化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF CHEMICAL THERMODYNAMICS
·
2024
·
IF 2.2
Dongmei Xu,Hailin Sun,Nan An,Jun Gao,Lianzheng Zhang,Yixin Ma,Yinglong Wang
Levulinic acid (LA) is a crucial bio-based chemical with extensive industrial applications. Due to its significant share in the cost of production, the development of efficient techniques for the separation of LA is essential. Traditional separation using sulphuric acid raises environmental and cost concerns, making liquid–liquid extraction a more sustainable and cost-effective alternative. liquid–liquid equilibrium (LLE) investigation was carried out for two ternary mixtures of water + LA + isopropyl ether / methyl tert -butyl ether (MTBE) at two temperatures and 101.3 kPa. The results indicated that the solvent MTBE, as an extractant, showed a higher partition coefficient and selectivity for LA than isopropyl ether, demonstrating its superior effectiveness in recovering LA. The interaction insights between LA and the extractants were explored using quantum chemistry calculations, which aligned well with the collected results. The ascertained LLE data was modeled using the NRTL equation, achieving the RMSD values below 0.01, demonstrating a good concordance between the collected data and computed values. The fitted NRTL model parameters are conducive to the designing and optimizing the LA separation process.
研究领域:
化学工程
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环境科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Peng Wang,Changchao Jia,Jia Li,Ping Yang
A high efficiency photocatalyst , TiO 2 (B)/anatase spheres consisted of nanosheets were prepared. Thioglycolic acid (TGA) was added into the precursor to control the hydrolysis process of titanium source (TiCl 3 ), which is a key to adjust the microstructure of products. The results indicated that TGA-modified samples revealed enhanced photocatalysis performance compared with the one without TGA. The photocatalysis performance of TGA-modified sample is about 15 times high compared with commercial P25. This is ascribed to mixed crystal phase and lattice distortion which resulted in more activity sites (e.g. Ti 3+ and oxygen defects). The loading of Au nanoparticles in different ways confirms that rich Ti 3+ -oxygen vacancies on the surface of samples caused super photocatalytic performance.
研究领域:
材料科学
·
环境科学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）