EUROPEAN POLYMER JOURNAL
·
2020
·
IF 3.862
Muhammad Zaheer,Jinxian Yang,Xu Wang,Lianwei Li
This work aims to systematically elucidate the biodegradation and crystallization behaviors of the model hypergraft systems made of poly( ε -caprolactone) (PCL) and poly[tri(ethylene glycol) methyl ether acrylate] (PTEGMA) blocks. A series of hyperbranched PCL (HB-PCL n ) with varied subchain lengths were synthesized using AB 2 -type macromonomers with different degrees of polymerization ( DP s). The HB-PCLs were grafted with linear PTEGMA chains to prepare amphiphilic hypergraft copolymers (HB-PCL n - g -PTEGMA m ) to eventually get self-assembled structures through micellization. The DP of PTEGMA was also varied to get two sets of samples with varied sub-chain lengths of the hyperbranched core and the linear corona within each individual set to systematically study the crystallization and biodegradation behaviors of PCL. Differential scanning calorimetric (DSC) measurements of both hypergrafts and linear precursors were compared in order to get insights into the crystallization pattern of PCL. We found that the degree of crystallization in PCL can be controlled from ~0 (lowest limit) to ~52% (highest limit) by structural regulation. Biodegradation studies were performed in aqueous medium with Lipase from Pseudomonas using dynamic light scattering (DLS). A model was proposed to correlate the sub-chain length of core, the chain length of corona with the biodegradation rate of PCL, which reveals that an increase of PCL content in HB-PCL n - g -PTEGMA m increases the crystallinity while decreases the rate of biodegradation in a predictable manner.
研究领域:
材料科学
·
生物学
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DOI
高影响因子
POLYMERS FOR ADVANCED TECHNOLOGIES
·
2019
·Vol. 31
·期 4
·853-863
·
IF 2.162
Guo Jiang,Li Yu,Mengdi Zhang,Feng Wang,Shuidong Zhang
Poly(propylene carbonate) (PPC) is an aliphatic polycarbonate synthesized from carbon dioxide and propylene oxide. Poly(3-hydroxybutyrate) (PHB) is a type of thermoplastic polyester produced by biological fermentation. The blending of PHB with PPC can effectively enhance the mechanical properties and barrier properties of PPC. Bionanocomposites of PPC/PHB enhanced by cellulose nanocrystal (CNC) are prepared via a two-step process using polyethylene glycol as a carrier. Results show that the oxygen barrier properties of the composites increased with the increase of the CNC content. When the CNC content is 1 wt%, the oxygen barrier performance increases nearly 18 times. The assumed model can predict the barrier performance of composites with the combined influence of morphology and CNC distribution. This will make PPC/PHB/CNC nanocomposites a very promising degradable material for food packaging application.
研究领域:
材料科学
·
生物工程
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DOI
高影响因子
BIOMACROMOLECULES
·
2025
·
IF 5.4
Juan Torres-Rodríguez,Ricardo A. Pérez-Camargo,Yunxiang Shi,Kaojin Wang,Yong-Guang Jia,X. X. Zhu,Alejandro J. Müller
Poly(ε-caprolactone-ran-ω-pentadecalactone) (PCLx-PPDLy) copolymers were synthesized by using ring-opening polymerization with Candida antarctica lipase B as a catalyst across various compositions. The aim was to study their crystallization behavior and ascertain whether they are isomorphic or isodimorphic. Differential scanning calorimetry, polarized light optical microscopy, in situ wide- and small-angle X-ray scattering, and Fourier-transform infrared spectroscopy were employed to assess the crystallization mode. Various crystallization conditions were used to investigate their influence on the comonomer inclusion/exclusion balance. The copolymers exhibited pseudoeutectic behavior across all compositions, crystallizing in either PPDL-type or PCL-type unit cells and conformations, independent of crystallization conditions. This indicates that they are isodimorphic, contrary to previous reports. Self-nucleation tests showed that the Domain II width decreases with increasing comonomer content, supporting isodimorphism. The pseudoeutectic point was observed at CL contents above 83%, which explains the previously unrecognized isodimorphic character of these copolyesters.
研究领域:
高分子化学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
Collagen and Leather
·
2024
·Vol. 6
·期 1
·1-10
·
IF 0
Pan Siyu,Liu Demeng,Sun Xianchong,Hou Delong,Yan Jun,Zeng Qi,Chen Yi
The global scenario on PVC plasticizer is experiencing a drastic change from petroleum-based, toxic di-(2-ethylhexyl) phthalate (DEHP) toward renewable, non-toxic bio-alternatives. However, replacing diisodecyl phthalate (DIDP), a DEHP analogue specifically intended for plasticizing PVC automotive upholstery, with bio-alternative remains a challenge as few bio-plasticizer volatilizes from PVC as slowly as DIDP, a crucial aspect compulsorily required by automotive industry. Here, we demonstrate that covalently attaching two short esters at the α -position of all components of a traditional epoxidized fatty acid methyl ester via a two-step, hydrogen-to-ester nucleophilic substitution in a one-pot procedure yields an epoxidized fatty acid tri-ester bio-plasticizer with remarkably suppressed volatilization from PVC, and hence an extremely low fogging value comparable to DIDP. With this strategy in hand, DIDP, long deemed irreplaceable despite its toxicity and non-renewable nature, may ultimately be phased out. Graphical Abstract
研究领域:
高分子材料
·
绿色化学
·
汽车工业
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DOI
IONICS
·
2019
·Vol. 25
·期 8
·3695-3704
·
IF 2.289
Wang Yi-Fan,Sun Ming,Liu Wei-Liang,Ren Man-Man,Kong Fan-Gong,Wang Shou-Juan,Wang Xin-Qiang,Peng Dan,Sun Jian-Lei
Polymer films composed of thermoplastic polyurethane (TPU), poly (methyl methacrylate) (PMMA), and titania were developed by solution-casting method. Accordingly, gel polymer electrolytes (GPEs) were prepared by soaking the films in commercial liquid electrolytes for 8 h. The prepared GPEs could fix the liquid electrolytes inside and kept the shape stable. The hybrid GPEs exhibited a maximum ionic conductivity of 3.9 × 10 −3 S cm −1 at room temperature, with an electrochemical stability of up to 4.8 V versus Li + /Li. The compatibility test demonstrated that the introduction of PMMA and TiO 2 improved the interfacial compatibility between lithium and GPEs. In battery test, the Li/GPE/LiFePO 4 cell delivered the first discharge capacity of 169.2 mAh g −1 at 0.1 C and stable cycle performance (the retention of capacity is nearly 92% after 60 cycles) with high coulombic efficiency. All results demonstrated that the hybrid GPE was promising to satisfy the application in the future.
研究领域:
材料科学
·
电化学
·
能源存储
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DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2021
·Vol. 102
·期 5
·1812-1822
·
IF 3.639
Wenyi Chen,Li Xu,Nanjing Zhong
BACKGROUND Enzymatic esterification is attracting for particular high-acid oil deacidification. In this study, Candida antarctica lipase B (CALB) was encapsulated into a series of nucleotide-hybrid metal coordination polymers (CPs), which were constructed by guanosine 5′-monophosphate (GMP) and various metals. RESULTS We here found that, most of the present CPs encapsulated CALB (CALB@CPs) samples were highly selective for esterification while poor in glycerolysis reaction. They exhibited quite poor performance in glycerolysis, with triacylglycerols (TAGs) conversion lower than 5%, despite this considerable enzymatic hydrolysis activities were observed. However, they (most of them) showed good performance in esterification of fatty acids and glycerol for TAG synthesis. In addition, the GMP/Tb (CPs constructed by GMP and Tb 3+ ) encapsulated CALB (CALB@GMP/Tb) transformed over 98% of oleic acid into glycerides in the high-acid oil deacidification process, and TAG content from 87 to 89% was obtained. Moreover, the CALB@GMP/Tb showed good reusability in the esterification system. CONCLUSION The present CALB@CPs samples are selective for esterification and suitable for high-acid oils deacidification. This work provides a new system for enzymatic selectivity improvement study. © 2021 Society of Chemical Industry.
研究领域:
生物化学
·
酶工程
·
催化化学
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DOI
高影响因子
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
·
2017
·
IF 0
Fei Zhao,Ye Yin,Dongqiao Zhang,Ping Ning,Manhua Fu,Daai Yao,Xiaohong Peng
A novel copolymer was synthesized by vinylidene chloride (VDC)/methyl acrylate (MA)/glycidyl methacrylate (GMA). The Fourier transform infrared (FTIR) and 1H-nuclear magnetic resonance analyses indicated that the copolymer of VDC/MA/GMA (PVMG) was synthesized successfully. The influences of GMA on the molecular weight, melting point, and thermal stability of copolymer were investigated by gel permeation chromatograph, differential scanning calorimeter, thermogravimetric analysis–FTIR, respectively. The copolymerization eliminated the phenomenon of “double melting peaks” for poly(vinylidene chloride), and the melting point was reduced to 165°C. The GMA also enhanced the thermal stability of copolymer, which was proved by the increased decomposition temperature of copolymer. The existence of GMA caused the cross-linking of the copolymer, which contributed to the improvement of barrier performance of PVMG.
研究领域:
高分子化学
·
材料科学
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DOI
Journal of Macromolecular Science Part A-Pure and Applied Chemistry
·
2020
·
IF 1.349
Dawei Chen,Lijun Chen
The long carbon chain monomer modified polyacrylate latex was successfully prepared by semi-continuous seeded emulsion polymerization. In this work, methyl methacrylate and butyl acrylate were used as main monomers; stearyl acrylate was used as functional monomer, which were emulsified with the novel mixed surfactants of disodium laureth sulfosuccinate (AEMES) and alkylphenol ethoxylates (OP-10) and initiated with 2,2′-azobis (2-methyl propion- amidine) dihydrochloride initiator. The structure of the resultant latex was characterized by Fourier transform infrared spectroscopy. The differential scanning calorimetry, thermogravimetric analysis and contact angle were used to test the properties of the latex film. The particle size of the latex was measured by the Zetatrac dynamic light scattering detector. Factors, which have an influence on the properties of the latex and its film, have been investigated in detail. Results show that the optimal condition of synthesizing the latex is as follows: the amount of emulsifiers is 4%; the mass ratio of AEMES to OP-10 is 3:1; the amount of initiator is 0.7%; the content of SA is 6%.
研究领域:
高分子科学
·
材料工程
·
化学合成
·
胶体与界面化学
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DOI
高影响因子
Russian Journal of Physical Chemistry A
·
2023
·Vol. 97
·期 6
·1263-1271
·
IF 0.7
Yang Hanhan,Wu Jianmeng,Li Zhenxing,Hao Xinying,Li Hua
Abstract A new biodegradable cellulose derivative-non-isocyanate polyurethane (NIPU) was prepared, and densities, viscosities, and surface tension of NIPU were measured by density bottle method, capillary viscometer and BZY-2 type full automatic surface tension meter respectively from 298.15 to 318.15 K. The results showed that densities, viscosities and surface tension were related to temperature and concentration. The viscosity and surface tension decreased with the increase in temperature at the same concentration; at the same temperature, viscosity and surface tension were positively correlated with concentration. And the experimental data were correlated by the correlation equations of viscosity and temperature, they showed a good agreement with the fitting results of the related equations.
研究领域:
材料科学
·
聚合物化学
·
物理化学
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2025
·
IF 7.3
Li Wang,Jun Xiang,Can Li,Haojun Fan,Zhe Sun
Vegetable oil-based waterborne polyurethanes (WPUs) demonstrate significant potential as eco-friendly anticorrosion coatings due to their hydrophobic aliphatic chains. However, the hydrolysis susceptibility of backbone-incorporated ester groups inherently derived from vegetable oil structures has been consistently overlooked in corrosion protection enhancement. Herein, we developed structurally engineered diols with side-chain-ester groups, which were systematically incorporated (0–100 %) into WPUs as replacements for petroleum-based polyester glycol, with successful synthesis confirmed by FTIR and SEM-EDS characterization. The emulsions' average particle size (increasing from 25.0 to 137.3 nm), water tolerance (water contact angle increasing from 59.1° to 80.3° with absorption decreasing from 136 % to 31 %), and chemical resistance (i corr decreasing from 1.53 × 10 −6 to 5.79 × 10 −8 A cm −2 ) of WPUs were all enhanced by the diols' incorporation. Crucially, side-chain-ester WPUs exhibit superior corrosion resistance versus castor oil-based WPUs (backbone-esters), maintaining structural/spectral stability after 24 h alkaline treatment, while castor oil films degrade (FTIR peak attenuation) and polyester glycol controls fail completely. This work establishes side-chain ester relocation as an innovative molecular design strategy to significantly enhance the corrosion resistance of vegetable oil-based coatings.
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产品关联
DOI
高影响因子
INORGANIC CHEMISTRY COMMUNICATIONS
·
2022
·
IF 3.428
Shangyu Li,Rui Liu,Xiao Han,Chunhua Ge,Xiangdong Zhang
In this paper, (3-aminophenyl)boronic acid pinacol ester was employed as a raw material to react with different aromatic aldehydes. Then diethyl phosphite was introduced to produce the addition reaction of carbon nitrogen double bond to prepare four diethyl α-aminophosphonate derivatives, which were diethyl[phenyl({[3-(tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]amino})methyl]phosphonate (BNP 1 ), diethyl[(4-methoxyphenyl)({[3-(tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]amino})methyl]phosphonate (BNP 2 ), diethyl [(4-nitrophenyl)({[3-(tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]amino})methyl]phosphonate (BNP 3 ), and diethyl[(4-methylphenyl)({[3-(tetramethyl-1,3,2-dioxaborolan-2-yl)phenyl]amino})methyl]phosphonate (BNP 4 ). The prepared compounds were characterized by 1 H and 13 C NMR, MS, FT-IR and PL (Photoluminescence Spectroscopy). Four derivatives perform high thermal stability. In addition, it exhibits good friction properties for rapeseed oil (RSO) at low concentrations. Compared with BNP 1 , BNP 2 and BNP 4 , BNP 3 exhibits best on friction-reducing and anti-wear performances attributed to the strong electron withdrawing ability of the nitro group in BNP 3 , which is also reflected in the solid-state fluorescence. Therefore, the four diethyl α-aminophosphonate derivatives have potential industrial applications as lubricant additives .
研究领域:
化学工程
·
材料科学
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DOI
高影响因子
MOLECULES
·
2022
·Vol. 27
·期 6
·1950
·
IF 4.927
Yue Wang,Jing Feng,Song Wu,Huihui Shao,Wenxuan Zhang,Kun Zhang,Hanyilan Zhang,Qingyun Yang
A new derivatization high-performance liquid chromatography method with ultraviolet detection was developed and validated for the quantitative analysis of methanesulfonate genotoxic impurities in an innovative drug for the treatment of non-alcoholic fatty liver disease. In this study, sodium dibenzyldithiocarbamate was used as a derivatization reagent for the first time to enhance the sensitivity of the analysis, and NaOH aqueous solution was chosen as a pH regulator to avoid the interference of the drug matrix. Several key experimental parameters of the derivatization reaction were investigated and optimized. In addition, specificity, linearity, precision, stability, and accuracy were validated. The determined results of the samples were consistent with those obtained from the derivatization gas chromatography–mass spectrometry analysis. Thus, the proposed method is a reliable and practical protocol for the determination of trace methanesulfonate genotoxic impurities in drugs containing mesylate groups.
研究领域:
药物分析
·
毒理学
·
分析化学
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DOI
高影响因子
危险品化学品经营许可证（带存储）