EUROPEAN POLYMER JOURNAL
·
2023
·
IF 6
Hongxu Meng,Zhisong Li,Linbo Wu
Poly(ethylene 2,5-furandicarboxylate) (PEF) is an important biobased polyester with not only high glass transition temperature ( T g ), excellent strength and rigidity but also superior gas barrier properties. However, its poor ductility could limit its applications. In this study, 2,5-thiophenedicarboylic acid (TDCA) was used to modify PEF by copolycondensation. By introducing 10–40 mol% TDCA, poly(ethylene 2,5-thiophenedicarboxylate-co-2,5-furandicarboxylate) (PEThF) copolyesters with intrinsic viscosity of 0.63–0.77 dL/g were synthesized and characterized with 1 H NMR, DSC, TGA, etc . The copolyesters are all amorphous polymers. Brittle-ductile transition was observed during tensile testing of PETh 10 F (PEThF containing 10 mol% 2,5-thiophenedicarboxylate unit). PEThFs containing 20–30% 2,5-thiophenedicarboxylate unit showed not only clearly improved ductility but also well-maintained performance advantages of PEF including high T g (84–81 °C), modulus (∼3.2 GPa), strength (yielding 95 MPa, breaking 60 MPa) and oxygen barrier (5.4–5.0 times PET).
研究领域:
材料科学
·
聚合物化学
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DOI
高影响因子
ACS Applied Polymer Materials
·
2024
·
IF 4.4
Qi Jiang,Han Hu,Qingyang Luan,Hanxu Zhu,Jinggang Wang,Jin Zhu
Poly(ethylene 2,5-furandicarboxylate) (PEF) is a type of biobased polyester with a high gas barrier, which has the potential to replace polyethylene terephthalate (PET). In view of the poor toughness of PEF, an innovative attempt was made to install a small amount of 2,5-thiophenedicarboxylic acid (TDCA) into the PEF backbone and synthesize the poly(ethylene furandicarboxylate-co-thiophenedicarboxylate) (PEFS-n) copolyester. The obtained PEFS-n demonstrates thermal stability and glass transition temperature (Tg) comparable to that of PEF. Additionally, the tensile properties of PEFS-n exhibit appreciable enhancements. The impact strength of PEFS-n exhibited a markedly higher value than that of PEF, particularly in the case of PEFS-5, which displays a 138% increase in impact strength. Concurrently, PEFS-n exhibits enhanced barrier characteristics (oxygen, carbon dioxide, and water) than PET, in addition to outstanding solvent resistance and transparency. After 4 h of hydrolysis in alkaline solutions at 80 °C, subsequently simply washing and filtering, more than 90% of FDCA monomer could be recovered. This work provides a direction for high impact and heat-resistant green packaging, as sustainable alternatives to PET.
研究领域:
材料科学
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环境科学
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化学工程
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DOI
高影响因子
Polymers
·
2023
·Vol. 16
·期 1
·103
·
IF 5
Qiao Zhou,Yuanyuan Zhao,Yafei Shi,Rongrong Zheng,Liying Guo
Utilizing triethylenediamine (DA), 1,3-propanesultone (PS), whose ring opens during the formation of the dizwiterion-intermediate DA-2PS, and the metal chlorides XCly, where X = Sn(IV), Zn(II),Al(III), Fe(III) and Mn(II), are used for the synthesis of five kinds of acidic metal-based functionalized ionic liquid catalysts ([DA-2PS][XCly]2). Their chemical structures, thermal stability and dual acidic active site were analyzed. We investigated the performance of [DA-2PS][XCly]2in catalyzing the esterification reaction between 2,5-furandicarboxylic acid (FDCA) and ethylene glycol (EG) to synthesize poly (ethylene 2,5-furandicarboxylate)(PEF). Among the catalysts tested, [DA-2PS][SnCl5]2exhibited the best catalytic performance under identical process parameters, and the optimal catalyst dosage was determined to be 0.05 mol% based on FDCA. The optimal conditions for the reaction were predicted using response surface methodology: a feed ratio of EG:FDCA = 1.96:1, an esterification temperature of 219.86 °C, a polycondensation temperature of 240.04 °C and a polycondensation time of 6.3 h, with a intrinsic viscosity of 0.67 dL·g−1. The resulting PEF was experimentally verified to exhibit an intrinsic viscosity of 0.68 dL·g−1and a number average molecular weight of 28,820 g·mol−1. Finally, the structure and thermal properties of PEF were characterized. The results confirmed that PEF possessed the correct structure, exhibited high thermal stability and demonstrated excellent thermal properties.
研究领域:
化学工程
·
材料科学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF FOOD ENGINEERING
·
2017
·
IF 3.099
Fusheng Zhang,Meiling Tian,Muying Du,Ting Fang
Pectinase is commercially important in the fruit processing and fiber degumming industries. Emerging technologies that improve its stability and activity could have potential in improving its commercial value further. The effects of pulsed electric field (PEF) treatment on the enzymatic activity, kinetics and conformational structure of pectinase were evaluated. Maximum activity was obtained at 12 kV/cm and a flow velocity of 80 mL/min, and was 21.89 ± 1.67% higher than the untreated enzyme. This enhancing effect could be maintained for 19 h when the treated enzyme was stored at 4 °C. PEF treatment increased the enzyme kinetic constants V max , k cat , t 1/2 , ΔG , and decreased K m , k , Ea , ΔH , and ΔS , indicating improved affinity between enzyme and substrate and enhanced catalytic efficiency. PEF treatment did not alter the polypeptide composition of the pectinase molecules, but induced the transfer of the tryptophan micro-environment from the polar surface to the hydrophobic interior, with a 10.28% increase in α-helices and a 17.80% reduction in random coils.
研究领域:
食品科学
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生物技术
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酶学
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产品关联
DOI
高影响因子
POLYMER DEGRADATION AND STABILITY
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2023
·
IF 5.9
Yuhao Zhao,Yuxuan Li,Yuze Dai,Ying Zhang,Min Jiang,Guangyuan Zhou
As a candidate of fossil-based poly(ethylene terephthalate) (PET), bio-based poly(ethylene 2,5-furandicarboxylate) (PEF) that could be converted from renewable resources has attracted attention from academia and industry. Here, we prepare a series of new type of PEF/TiO 2 NWs composites from 2,5-furandicarboxylic acid (FDCA), ethylene glycol (EG), titanium dioxide nanowire (TiO 2 NWs, diameter∼100 nm, length∼20 µm) and dipentaerythritol (Di-PE) via in-situ polymerization. The TiO 2 nanowires (0.5∼10 wt‰ based on PEF) and Di-PE (3 mol‰ based on FDCA) were added as fillers and extenders. TiO 2 nanowires were distributed in the PEF uniformly, shown by SEM. Compared with pure PEF, the T g and thermal stability of all nanocomposites got improved. And the impact strength of nanocomposites could reach 60 kJ/m 2 in contrast to brittle pure PEF. The UV-A and blue-light shielding of nanocomposites increased from 53 % to 98 % and 28 % to 86 %, respectively, and the nanocomposites still maintained good gas barrier properties. Moreover, the antibacterial activity of nanocomposites against E. coli had increased to 98 %, better than that of the PEF/Ag NWs composites. By uniaxial pre-stretching, the tensile modulus and the elongation at break were improved obviously, from 1840 MPa to 5466 MPa and 4 % to 54 % respectively with pre-stretching ratio increasing. Compared to the PET/TiO 2 NWs composites, the PEF/TiO 2 NWs composites shows batter thermal property and mechanical property. The PEF/TiO 2 NWs composites exhibit potential foreground in the packaging application.
研究领域:
材料科学
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生物基材料
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纳米技术
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产品关联
DOI
高影响因子
Applied Materials Today
·
2025
·
IF 6.9
Weiqiang Han,Xia Liao
In this work, we reported a facile approach for fabricating external catalyst-free poly (ethylene 2,5-furandicarboxylate)/poly (trimethylene carbonate) (PEF/PTMC) blend vitrimer through two-step reactive blending by the addition of 2,2-bis(hydroxymethyl) 2,2′,2″-nitrilotriethanol (BIS-TRIS) and N, N′-tetraglycidyldiaminodiphenyl methane (TGDDM) for the first time. This method breaks through the difficulties of the traditional preparation method of vitrimer materials that must require the addition of metal catalyst, thus realizing the concept of green chemistry. At the same time, it also breaks through the difficulty of poor compatibility in the traditional blend preparation methods. Swelling and FTIR tests confirmed the presence of the dynamic cross-linking structure consisting of PEF and PTMC chains, while rheological analysis shows that the formed cross-linked network in PEF/PTMC blend can significantly improve its melt strength and make it could be foamed by supercritical carbon dioxide. An expansion ratio about 10-fold and microcellular foam with a uniform cell morphology can be obtained for PEF/PTMC composite vitrimer when the PTMC content and the gel content was less than 20% and 50%, respectively. Moreover, PEFMC foams possess greater compressive strength than that of commercial PET foams, exhibiting excellent mechanical properties. TGA and tensile experiments revealed that PEF/PTMC composite vitrimer exhibited excellent mechanical performance and thermal stability. Meanwhile, PEF/PTMC composite vitrimer still maintain the ability of excellent reprocessability. This work provides a practical green method to guide the design of novel polymer blends with improved miscibility, mechanical properties and sustainability by a dynamic cross-linking network.
研究领域:
材料科学
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绿色化学
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DOI
高影响因子
PROTEIN JOURNAL
·
2016
·Vol. 35
·期 2
·154-162
·
IF 1.029
Tian Mei-ling,Fang Ting,Du Mu-ying,Zhang Fu-sheng
To explore an efficient, safe, and speedy application of pulsed electric field (PEF) technology for enzymatic modification, effects of PEF treatment on the enzymatic activity, property and kinetic parameters of α-amylase were investigated. Conformational transitions were also studied with the aid of circular dichroism (CD) and fluorescence spectra. The maximum enzymatic activity of α-amylase was obtained under 15 kV/cm electric field intensity and 100 mL/min flow velocity PEF treatment, in which the enzymatic activity increased by 22.13 ± 1.14 % compared with control. The activation effect could last for 18 h at 4 °C. PEF treatment could widen the range of optimum temperature for α-amylase, however, it barely exerted any effect on the optimum pH. On the other hand, α-amylase treated by PEF showed an increase of V
max , t 1/2 and Δ G , whereas a decrease of K
m and k were observed. Furthermore, it can be observed from fluorescence and CD spectra that PEF treatment had increased the number of amino acid residues, especially that of tryptophan, on α-amylase surface with enhanced α-helices by 34.76 % and decreased random coil by 12.04 % on α-amylase when compared with that of untreated. These changes in structure had positive effect on enhancing α-amylase activity and property.
研究领域:
食品科学
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生物技术
·
酶学
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产品关联
DOI
PubMed
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Weiqiang Han,Xia Liao
Constructing a stable interfacial adhesion morphology of polymer blends remains an ongoing challenge in terms of the intrinsic instability of phase morphology. Herein, we obtained poly(ethylene 2,5-furandicarboxylate)/poly(glycolic acid) (PEF/PGA) blends with stable interface adhesion morphology and excellent physical properties by a two-step reactive blending method with the assistance of 2,2-bis(hydroxymethyl)-2,2,2-nitrilotriethanol (BIS-TRIS) and reactive elastomer (EGMA). Due to the formation of bonding points and branched/cross-linked structures, the interfacial morphology and melt strength of blends are significantly improved, leading to obviously enhanced foaming properties, thermostability, and mechanical properties. Specifically, when EGMA content was less than 20%, the blends still maintained tensile strength similar to that of neat PEF but with excellent toughness. Furthermore, all blend foams possess thin-walled cells with relatively uniform morphology, and the expansion ratio is more than 10-fold and shows greater compressive strength than commercial PET foams. Moreover, when the PEGMA foam was immersed in water for 2 weeks, the compression strength of the foam decreased by more than 70%, which makes it potentially useful in the field of temporary support.
研究领域:
高分子材料科学
·
生物可降解材料
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反应性加工
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泡沫材料
·
聚合物共混
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产品关联
DOI
高影响因子
JOURNAL OF FOOD ENGINEERING
·
2014
·
IF 2.576
Zhi-Wei Liu,Xin-An Zeng,Da-Wen Sun,Zhong Han,Rana Muhammad Aadil
The permeability change of vesicles composed of soya phosphatidylcholine (PC) and dipalmitoyl phosphatidylcholine (DPPC) encapsulated with 5(6)-carboxyfluorescein (CF) suspended in isotonic sucrose solution under separate or combined thermal and continuous pulsed electric field (PEF) treatments was investigated, respectively. The electric field intensity applied was in the range from 20 to 40 kV/cm with total treatment time of 1.2 ms, and thermal treatments were conducted at temperatures from 15 to 65 °C. Results indicated that the permeability behavior between DPPC vesicles and soya PC vesicles were quite different under the experimental conditions. Compared to soya PC vesicles, DPPC vesicles were more sensitive to thermal treatments. As the temperature increased to 41 °C, the 5(6)-CF release percentage (R) reached almost 100% abruptly. On the other hand, the synergetic effects of PEF and temperature on permeability of two vesicles were apparently different. For soya PC vesicles, the increment degree of R value was almost the same under various combination treatment conditions. However, for DPPC vesicles, it was demonstrated that the lipid bilayers membrane was almost impermeable to CF when the PEF strength was lower than 30 kV/cm at 20 °C and 20 kV/cm at 30 °C. As the temperature increased to 38 °C, the permeability of DPPC vesicles was significantly increased with increasing PEF intensity, reaching 25.25% at 40 kV/cm. Results from the current study could be helpful for better understanding of the underlying mechanism on PEF inactivation as affected by the lipid composition of cell membrane and its phase transition temperature.
研究领域:
生物物理学
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膜生物技术
·
食品科学
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产品关联
DOI
高影响因子
LWT-FOOD SCIENCE AND TECHNOLOGY
·
2022
·
IF 6.056
Jin Wang,Qijun Wang,Liang Xu,Da-Wen Sun
Effects of extremely low frequency pulsed electric field (ELF-PEF) on the total volatile basic nitrogen (TVB-N), thiobarbituric acid reactive substance (TBARS), total microorganism number, protein oxidation and denaturation, enzymatic activity, microstructure, and sensory quality of tilapia fillets during cold storage at 4°C for 6 days are evaluated. The results show that the TVB-N value and total microorganism number in the treated group are within the international standard (< 20 mg/100 g, < 7 log 10 CFU/g) during the storage, and the shelf-life of the treated group is extended by 1 - 2 days as compared with the control. In addition, ELF-PEF treatment inhibits sample quality deterioration during storage, as reflected by a small change in colour, slow softening of texture, less protein oxidation and denaturation, lower endogenous enzyme activity, and tighter microstructure compared to the control, indicating the promising of ELF-PEF treatments for fish preservation during cold storage.
研究领域:
食品科学
·
食品保鲜
·
微生物学
·
生物化学
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产品关联
DOI
高影响因子
Innovative Food Science & Emerging Technologies
·
2019
·
IF 4.085
Ming Dong,Yujuan Xu,Yumei Zhang,Minyi Han,Peng Wang,Xinglian Xu,Guanghong Zhou
The present study was performed to clarify the effects of pulsed electric field (PEF) on the physicochemical properties and conformations of myofibrillar proteins (MPs) extracted from pale, soft, exudative (PSE)-like chicken breast meat. Various PEF parameters, including the electric field intensity (0–28 kV/cm) and pulse frequency (0–1000 Hz), were varied. The results showed that as the PEF intensity increased, the solubility, surface hydrophobicity and sulfhydryl group content of the MPs were significantly improved. However, when the intensity exceeded 18 kV/cm, these properties declined, which was possibly due to protein aggregation caused by functional group interactions. Additionally, the PEF treatment altered the rheological properties of PSE-like MPs and induced the formation of low-elasticity MPs. However, sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) demonstrated that the primary structure of the MPs was not altered after the PEF treatment. According to the circular dichroism (CD) spectroscopy results, the α-helix contents of the PEF-treated samples were increased but the β-turn and random coil contents were reduced. Industrial relevance The occurrence of PSE-like chicken meat is one of the most serious quality issues worldwide and can decrease the consumer's purchasing desire and result in extensive economic losses for the poultry processing industry. MPs play a vital role in the qualitative characteristics of chicken products. As a potential novel processing technology, PEF has potential applications for improving the functionality of PSE-like chicken protein to expand its application in the food industry.
研究领域:
食品科学
·
蛋白质化学
·
肉类加工
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产品关联
DOI
高影响因子
Food Physics
·
2026
·
IF 7.5
Zhong Han,Jun-Wei Ma,Wen-Hong Gao,Yu-Huan Geng,Ji Ma,Muhammad Faisal Manzoor,Xin-An Zeng,Muhammad Talha Afraz
This exploratory product development study compared the final product performance of a laboratory prepared soft candy (LPS) containing separately optimized pulsed electric field (PEF) modified starch and PEF-ultrasound (PEF+US) treated ginger with three commercially available ginger candies. The LPS showed the highest measured total phenolic content (62.01 mg GAE/g), gingerol concentration (867.59 µg/g), and in vitro radical scavenging activity with 51.53% DPPH inhibition and 52.31% ABTS inhibition. It also showed lower hardness, gumminess, and chewiness, greater adhesiveness, and higher springiness than the commercial products, while a semi trained panel of 10 assessors assigned it the highest mean overall acceptability score. FTIR revealed a distinct matrix fingerprint, while HPLC and colorimetric assays confirmed the higher bioactive content of the LPS. These findings characterize the performance of the complete LPS formulation relative to the commercial products, while the contributions of the individual pretreatments and formulation components were not assessed separately. Download: Download high-res image (125KB) Download: Download full-size image
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DOI
高影响因子
危险品化学品经营许可证（带存储）