POLYMER INTERNATIONAL
·
2018
·Vol. 67
·期 9
·1221-1228
·
IF 2.352
Meng Ma,Kai Liu,Haiming Zheng,Si Chen,Bozhen Wu,Yanqin Shi,Xu Wang
Poly( l -lactic acid)/crosslinked polyurethane (PLLA/CPU) blends which were prepared via reactive blending of PLLA with poly( ϵ -caprolactone) (PCL), glycerol and 4,4′-methylenediphenyl diisocyanate showed excellent toughness. The effects of the composition of the mixture and degree of crosslinking of CPU on the toughness of the PLLA/CPU blends (80/20 w/w) were studied in detail. Dynamic mechanical analysis and rheological measurements were used to characterize the structure of the in situ formed CPU in the PLLA matrix. A novel netlike phase structure was observed when the average molecular weight of PCL and degree of crosslinking were 1 kDa and 10%, respectively. The impact strength of the blend was enhanced from 2.2 kJ m −2 for pure PLLA to 62.4 kJ m −2 ; meanwhile, the elongation at break was increased to 489.8%. Therefore, the mechanical properties of PLLA/CPU blends can be easily tailored by tuning the composition of the mixture and the degree of crosslinking of CPU. © 2018 Society of Chemical Industry
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 AGRICULTURAL AND FOOD CHEMISTRY
·
2020
·
IF 4.192
Ning Yu,Junying Li,Feng Ma,Pengfei Yang,Wenjie Liu,Mingyang Zhou,Zhifei Zhu,Shu Xing
A kind of biomaterial with antibacterial and mechanical properties was prepared using gelatin (GE) as a raw material. GE was modified by antibacterial epoxy quaternary ammonium salt (QAS) and then cross-linked with tannic acid (TA). Analysis of the Fourier transform infrared spectroscopy (FTIR) results showed that the cationic group was grafted onto GE by reaction of the amino of GE with the epoxy of QAS, and the cross-linking occurred between the amino of GE and the active groups of TA under alkaline conditions. The cross-linking degree was determined by the fluorescence method via a derivative reaction of fluorescamin. The influence of the cross-linking degree on the physical and chemical properties of the GE film was studied by scanning electron microscopy (SEM), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), X-ray diffraction (XRD), and mechanical testing. The results showed that the modified GE film formed a compact cross-linking structure, and its thermostability and mechanical properties were improved with increasing cross-linking degree. The in vitro antibacterial rate of the cross-linked cationic GE film to Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) reached 95.83% and 100% respectively, and the in vitro cell relative growth rate (RGR) of HeLa cells cultured in the extracted leachate of the cross-linked cationic GE film exceeded 85%, which illustrated that the modified GE film had excellent antibacterial activity and biocompatibility.
研究领域:
生物材料学
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高分子化学
·
医学材料
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产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 49
·30971-30979
·
IF 3.361
Huadong Zhang,Zhongyi Yan,Zhizhou Yang,Jinshui Yao,Qiuhong Mu,Dan Peng,Hui Zhao
A novel silicone resin (SR-OH) containing phenolic hydroxyl (Ph–OH) groups was designed and synthesized via co-hydrolysis/condensation and catalytic hydrogenation. During the curing process, the cross-linking degree of the resin was further increased by the Si–O–Ph bonds formed by the reaction of the Ph–OH and terminal Si–OH groups. Thermogravimetric analysis (TGA) showed that the cured resin product exhibited excellent thermal and thermo-oxidative stability, which was much higher than that of a typical methyl phenyl silicone resin (SR-Ph). The temperature at which 5% weight loss occurs (Td5) was up to 606 °C (nitrogen) and 542 °C (air), and its char yield at 800 °C was 91.1% and 85.3% in nitrogen and air, respectively. The significant improvement in thermal stability was mainly attributed to the formation of Si–O–Ph bonds which not only increases the cross-linking degree of the resin but also significantly prevents degradation by the ‘back-biting’ and oxidative cleavage.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2016
·
IF 2.267
Ting Pan,Wenjing Song,Xiaodong Cao,Yingjun Wang
Gelatin/Alginate hydrogels were engineered for bioplotting in tissue engineering. One major drawback of hydrogel scaffolds is the lack of adequate mechanical properties . In this study, using a bioplotter, we constructed the scaffolds with different pore architectures by deposition of gelatin/alginate hydrogels layer-by-layer. The scaffolds with different crosslinking degree were obtained by post-crosslinking methods. Their physicochemical properties, as well as cell viability, were assessed. Different crosslinking methods had little influence on scaffold architecture, porosity, pore size and distribution. By contrast, the water absorption ability, degradation rate and mechanical properties of the scaffolds were dramatically affected by treatment with various concentrations of crosslinking agent (glutaraldehyde). The crosslinking process using glutaraldehyde markedly improved the stability and mechanical strength of the hydrogel scaffolds. Besides the post-processing methods, the pore architecture can also evidently affect the mechanical properties of the scaffolds. The crosslinked gelatin/alginate scaffolds showed a good potential to encapsulate cells or drugs.
研究领域:
组织工程
·
生物材料科学
✓ 已验证
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2025
·
IF 8.5
Wensheng He,Ping Ma,Zutai Zhang,Benxiang Hou
Low cross-linking degree, weak mechanical strength, and poor osteoinductivity are significant obstacles in the development of bone repair materials. In this study, chitosan/gelatin/supersaturated calcium citrate scaffolds were prepared with the dehydrogenation heat treatment method. The results confirmed that citric acid significantly improved the cross-linking degree and efficiency of the chitosan/gelatin scaffolds. But the addition of Ca 2+ reduced the cross-linking degree, water absorption, and resistance to enzymatic degradation of the scaffolds. While, the supersaturated calcium citrate formed inside the scaffold increased its mechanical strength. The biocompatibility and osteogenic activity of scaffolds were measured by inoculation with MC3T3-E1 cells. The rapid and efficient release of Ca 2+ from the scaffolds could significantly promote cell adhesion, proliferation, and differentiation, while cell activities were inhibited by excessive Ca 2+ . The results of repairing skull defects in SD rats demonstrated that the chitosan/gelatin/supersaturated calcium citrate scaffolds with 25 mM Ca 2+ added had a stronger osteogenic effect compared to the chitosan/gelatin scaffolds. Hence, the chitosan/gelatin/ supersaturated calcium citrate scaffolds prepared in this study are promising materials for treating bone defects. The appropriate amount of calcium salt added to the scaffold in order to optimize its biocompatibility and osteogenic activity deserves further investigation.
研究领域:
生物材料学
·
组织工程学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CARBOHYDRATE POLYMERS
·
2020
·
IF 7.182
Cunli Pan,Junqing Qian,Changyan Zhao,Haiyang Yang,Xiaohua Zhao,Hui Guo
In order to reveal the relationship between the degree of crosslinking and the properties of chitosan nanoparticles, a potassium polyvinyl sulfate (PVSK) titration method was established for the determination of free amino group in chitosan, which showed that there was a window effect in the crosslinking degree and particle size of three kinds of molecular weight chitosan cross-linked by different content of tripolyphosphate (TPP), and the nanoparticles with moderate crosslinking degree were smaller. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) showed the moderate degree of cross-linking nanoparticles had strong antibacterial properties. IR analysis showed that the interaction between chitosan nanoparticles with different crosslinking degree and TPP were different. X-ray diffraction analysis showed that the cross-linked chitosan nanoparticles were amorphous. Above all, the crosslinking degree of TPP cross-linked chitosan nanoparticles was related to the particle size and antibacterial properties.
研究领域:
生物材料学
·
药剂学
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产品关联
DOI
PubMed
高影响因子
JOURNAL OF MEMBRANE SCIENCE
·
2023
·
IF 9.5
Yifan Zhang,Yaru Fan,Guoli Zhou,Yijun Cao,Jingtao Wang,Xiaobin Jiang,Ning Zhang,Shaohua Yin
With the rapid development of Li-ion batteries (LiBs), the demand for lithium sharply increased. Salt lakes contribute to major extractable lithium in the world, however, the efficient separation of Mg 2+ and Li + remains a challenge. The PEI-based nanofiltration (NF) membrane shows great potential for Mg 2+ /Li + separation in recent studies, due to its positively charged surface and tunable pore size. In this work, ethylenediamine-terminated polyethyleneimine (EDA@PEI) was utilized as the aqueous monomer reacting with trimesoyl chloride (TMC) via interfacial polymerization (IP) to fabricate a new class of PEI-based NF membranes. This work explored critical membrane fabrication parameters and characterizations of EDA@PEI NF membranes. Additionally, this work compared EDA@PEI-TMC and PEI-TMC membranes on their physicochemical properties and NF performance. The results show that PEI containing EDA groups at ends provides the probability for connection of the backbone via TMC, thus enhancing the cross-linking degree (DNC) of EDA@PEI NF membranes. Meanwhile, the presence of EDA groups enhances the Zeta potential of membranes. The best-performing EDA@PEI-TMC membrane exhibits the highest rejection for Mg 2+ of 99.21 %, and excellent Mg 2+ /Li + separation that S Li/Mg reaches 69.20, 80.62 and 46.79 at Mg 2+ /Li + mass ratios of 40:1, 60:1, and 120:1, respectively. During a 48-h NF test, EDA@PEI-TFC membrane shows consistent performance and steady flux. This work demonstrates the great application potential of EDA@PEI NF membranes for Mg 2+ /Li + separation, and provides a candidate for fabricating PEI-based NF membranes.
研究领域:
材料科学
·
环境工程
✓ 已验证
产品关联
DOI
高影响因子
POLYMER TESTING
·
2021
·
IF 4.282
Lin Xia,Yuan Ma,Qi Wang,Jiafeng Meng,Jieting Geng
The study of Eucommia ulmoides rubber (EUR) has received increasing attention in the past few years. In this manuscript, we prepared a series of novel Eucommia ulmoides rubber foams with excellent shape memory behavior. We studied the mechanical, thermal and shape memory properties of foamed composites and attempted to establish the relationship between microstructure and macroscopic properties. The results showed that the mechanical properties increased greatly from 4.1 MPa to 7.8 MPa with the increase of cross-linking agent. However, the shape memory properties of foamed composites were closely related to the crosslinking degree. In these EUR foams, the cross-linked network worked as a fixed phase, while the crystalline regions acted as a reversible phase in the shape memory behavior.
研究领域:
材料科学
·
生物学
✓ 已验证
DOI
高影响因子
ACS Applied Engineering Materials
·
2022
·
IF 0
Qiang Xue,Jinyuan Zhu,Wenqiao Meng,Kaisong Zhang
The effects of different dispersed phases of MXene nanosheets on polyamide nanofiltration membranes, which was first reported in this investigation, are still unclear. We found that when the MXene nanosheets were dispersed into the aqueous phase, the cross-linking degree of the interfacial polymerization (IP) reaction was low, thereby forming a rough and thin polyamide layer with nanovoids, which increased the pure water flux to 14.1 L m2– h–1 bar–1. When the MXene nanosheets were dispersed into the organic phase, the IP reaction was more thorough with a high degree of cross-linking. Therefore, the salt rejection was higher, with 99.1% of Na2SO4 rejection. We believe that different dispersed phases for 2D nanosheets had different impacts on the IP reaction and polyamide layer and we hope this study can provide ideas for selecting a suitable dispersed phase to develop optimization strategies.
研究领域:
材料科学
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化学工程
·
膜技术
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DOI
POLYMER
·
2023
·
IF 4.6
Jing Jiang,Xueyu Yuan,Xi He,Shengjie Guan,Qian Wu,Ming Liu,Li Liu,Yudong Huang
Although silicone resins are commonly seen as popular candidates for heat-resistant applications, the severe weight loss at the temperature from 400 to 800 °C remains a challenge. Herein, we reported a strategy to enhance the thermal resistance by introducing Zr into the main chain. Molecular simulation shows the Zr atoms led to the formation of high energy Zr–O bonds and increased the cross-linking degree which in turn suppressed the formation of cyclic oligomers , the results was further supported by TG-IR. The degradation activation energy was increased from 75.26 (ZAS0) to 88.67 kJ/mol (ZAS5) for the major degradation stage. The degradation kinetics study shows the degradation of ZAS5 followed the cylindrical symmetrical three-dimensional diffusion mechanism (n = 1.5). This work could provide a systemic experimental and theoretical foundation for thermal properties enhancement through metal atoms incorporation.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2024
·
IF 8.1
Mengting Wang,Zhongyang Wang,Muhammad Adnan Akram,Kuo Chen,Lihua Zhao,Q. Jason Niu
Polyamide pervaporation membranes, with excellent stability and resist swelling at high temperatures, enable superior capacity for high-salinity solutions compared to other pervaporation membranes. However, the low permeate flux impedes their technical realization for large-scale applications. Here, we prepared a pervaporation membrane based on a 5-sulfinyl amino isophthaloyl dichloride (NSO) monomer. NSO contains a sulfinamide group, which can be used as an acid-binding agent to combine with H + to promote the interfacial polymerization (IP) reaction, thus inhibiting the growth of the polyamide layer and leading to the formation of a thinner separation layer. In addition, the sulfinamide group is converted to an amino group during the IP process, which can continue to participate in the IP reaction and further enhance the cross-linking degree of the separation layer. The resulting ultrathin and highly crosslinked polyamide pervaporation membranes show exceptional performance in pervaporation desalination, achieving a pervaporation flux of 50.54 kg m −2 h −1 and a rejection of 99.99% when measured with 3.5 wt% NaCl solution as feed. NSO monomer presents a promising pathway to overcome the limitations of pervaporation desalination membranes, advancing the application potential of polyamide membranes for practical high-salt wastewater treatment.
研究领域:
材料科学
·
环境工程
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Composites and Hybrid Materials
·
2024
·Vol. 7
·期 4
·1-14
·
IF 23.2
Wang Ping,Tian Hongyu,Liu Wenxiu,Lu Haibing,Liu Jiajia,Dong Shi,Xu Jie,Cao Tian,Shi Min,Huang Haopeng,Zhou Yiyang
By structural design, a new type of highly functional ionic liquid (NHFIL) was synthesized by combining 1-vinylimidazole with tris(2-chloroethyl) phosphate through a one-pot method. When it is melted into the polymer composite, the highly reactive vinyl of NHFIL promotes the cross-linking within the polymer system to enhance the compatibility between the inorganic filler and polymer matrix and further improve the mechanical properties of the composite, additionally, the N and P elements would generate non-flammable gas phase and carbonized layer during combustion, which endows the polymer composites with remarkable flame-retardant performance. On this basis, the low-smoke flame retardant ethylene–vinyl acetate (EVA)-based composites were prepared by introducing NHFIL into the industrial formula of the cable sheath material for maglev trains. The effects of the composition and molecular structure of NHIFL on the interfacial compatibility, microstructure, mechanical properties, and flame retardancy of composite materials have been studied in detail. The results indicate that with the addition of NHFIL, the cross-linking degree, gel content, thermal stability, mechanical properties, oil resistance, and the flame retardancy of the EVA-based composites were comprehensively improved. Significantly, with a low addition of 3.5% NHFIL, the gel content reaches 90.3%, the carbon residue reaches 42.7%, and the limiting oxygen index (LOI) reaches 36.3%, and surprisingly, the oil resistance increased by five times, which endows the composites with great application potential in cables of major transportation equipment.
研究领域:
材料科学
·
高分子化学
·
交通运输工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）