POLYMER
·
2023
·
IF 4.6
Fang Liu,Yuan-yuan Lin,Xue Yang,Dan Zhang,Dong-hua Xu,Shi-fang Luan
The hydrolysis behaviour of polyborosiloxane (PBS) was investigated, and the hydrolysis resistance was evaluated. The change in chemical structure during the hydrolysis of PBS was characterized by FTIR, 11 B-NMR, etc. It was observed that the ternary borate ester in PBS was gradually hydrolyzed into binary and mono borate ester, and finally boric acid (BA) was produced. Rheological tests were used to investigate the effect of hydrolysis on the mechanical properties of PBS. It was observed that the plateau modulus and relaxation time of PBS decreased after immersion due to both the hydrolysis of PBS and the plasticizing effect of free water in the samples. It was also shown that as the free water evaporated during the drying process, the plateau modulus of the immersed PBS recovered somewhat. With regard to the hydrolysis resistance of PBS, the original PBS with a higher content of ternary borate ester has better hydrolysis resistance.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
SOLAR ENERGY
·
2022
·
IF 7.188
Meng Jia,Aimin Sha,Wei Jiang,Wentong Wang,Dongdong Yuan,Jiange Li,Jiasheng Dai,Wenxiu Jiao
The goal of this work is to improve the latent heat storage capacity and the thermal response rate of a polyurethane solid–solid phase change material (PUSSPCM) for evaluating its applicability as an alternative filler to cool an asphalt mastic. For this purpose, graphite/PUSSPCM (GPCM) structures with various mesh values and contents of graphite were synthesized. The latent heat was initially increased and then decreased with the increasing graphite content. By selecting the optimum content, a GPCM with a larger mesh can possess a higher latent heat. The existence of a relatively large content and mesh of graphite could lead to a higher thermal conductivity for GPCM. The latent heat storage capacity and the thermal conductivity of the synthesized GPCM-8000–1 were 23.2 % and 254.7 % higher than those of PUSSPCM , respectively. Meanwhile, the GPCM-8000–1 material configuration with excellent thermal stability at 200 °C can withstand the high-temperature construction environment of asphalt pavement without liquid leakage and decomposition. As a result, it is recommended as a solid–solid phase change filler to fabricate phase change asphalt mastics. The extracted outcomes from the rheological test results show that the high-temperature deformation resistance, low-temperature cracking resistance and fatigue resistance of the phase change asphalt mastics are improved in contrast to the traditional asphalt mastic. Finally, the cooling effect of the phase change asphalt mastics was evaluated, with the maximum cooling amplitude reaching the value of 5.6 °C.
研究领域:
材料科学
·
土木工程
·
热能存储
✓ 已验证
DOI
高影响因子
Polymers
·
2018
·Vol. 10
·期 11
·1264
·
IF 2.935
Jing Li,Meizhao Han,Yaseen Muhammad,Yu Liu,Zhibin Su,Jing Yang,Song Yang,Shaochan Duan
Styrene-butadiene styrene graphene oxide nanoplatelets (SBS-g-GOs)-modified asphalt was prepared by reacting thiolated GOs (GOs-SH) with SBS in asphalt using a thiol-ene click reaction. The temperature resistance and mechanical properties of asphalts were analyzed by dynamic shear rheology (DSR) and multiple-stress creep-recovery (MSCR) tests, which revealed that an optimum amount of GOs-SH (0.02%) can effectively improve the low temperature and anti-rutting performance of SBS asphalt. Segregation experiments showed that SBS-g-GOs possessed good stability and dispersion in base asphalt. Fluorescence microscopy results revealed that the addition of GOs-SH promoted the formation of SBS network structure. Textural and morphological characterization of GOs-SH and SBS were achieved by Fourier transform infra-red (FT-IR) spectroscopy, energy-dispersive X-ray spectroscopy (EDX), atomic-force microscopy (AFM), X-ray diffraction (XRD), and scanning electron microscopy (SEM), while surface chemical composition was tested by X-ray photoelectron spectroscopy (XPS). Based on textural characterization data, a suitable reaction mechanism was proposed that involved the preferential reaction between GOs-SH and 1,2 C=C of SBS. The currently designed GOs-SH incorporated asphalt via thiol-ene click reaction provides new ideas for the preparation of modified asphalt with enhanced mechanical properties for target-oriented applications.
研究领域:
材料科学
·
土木工程
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DOI
高影响因子
FOOD HYDROCOLLOIDS
·
2022
·
IF 11.504
Heng Du,Jun Liu,Boyuan Pan,Hong-Yan Yang,Guang-Bin Liu,Kui Lu
Peptide-based hydrogels were formed using low molecular weight peptides (LMWPs) derived from diphenylalanine as gelling agents. Sodium alginate (SA)was incorporated into the peptide skeleton to form a double-cross-linked hydrogel. The self-assembling mechanism was investigated by NMR, and the gelation behavior was studied by rheological tests. Hydrogen bonding and π-π stacking interactions play important roles in self-assembling of LMWPs. The rheological tests showed that the single-cross-linked hydrogel was formed by self-assembling AcNH-Thr-Phe-Phe-CONH 2 (AcTFFNH 2 , critical gelling concentration: 0.3 wt%), and the gelation temperature was in a range of 8–12 °C depending on the concentration of AcTFFNH2. The rigidity, stability and self-healing of the binary composite hydrogels were enhanced particularly when the content of AcTFFNH 2 and SA were 0.5 wt% and 0.3 wt%, respectively. Significant improvement of properties could be attributed to the double-cross-linking and enfolding in the assembled fibers with SA. These results indicate that peptide-based hydrogels formed by low molecular weight peptides have potential applications in the food industry.
研究领域:
材料科学
·
生物材料
·
化学
·
食品科学
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产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 140
·期 4
·e53372
·
IF 3.057
Guohao Miao,Hai Zhang,Yu Yang,Jin Qu,Xinru Ma,Junping Zheng,Xiaofei Liu
Zirconium is one of the most commonly used crosslinkers for guar gum-based fracturing fluid. Nevertheless, it is difficult for zirconium crosslinkers applied in fracturing to possess both high temperature resistance and adjustable crosslinking time. Meanwhile, few people did systematical research on the crosslinking process of fracturing fluid. In this study, an organic zirconium crosslinker with high temperature resistance and controllable crosslinking time was synthesized. The seawater-based fracturing fluid gel prepared with the crosslinker could perform well under 170°C. Oscillatory shear experiments were conducted to analyze the rheology of the gelation process. Moreover, steady-state shear and micro-rheological tests were conducted to analyze the dynamic and static crosslinking process of the fracturing fluid, respectively. Meanwhile, rheo-kinetic equation was used to fit the data and the effects that various factors had on the gelation process were illustrated thoroughly. This study not only prepared an organic zirconium crosslinker with good performances, but also explored the crosslinking process of fracturing fluid gel, which could improve its further application in oilfields.
研究领域:
石油工程
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES B-BIOINTERFACES
·
2014
·
IF 4.287
Wei Wei,Xinyu Hu,Xiaoliang Qi,Hao Yu,Yucheng Liu,Junjian Li,Jianfa Zhang,Wei Dong
Salecan is a novel microbial polysaccharide produced by Agrobacterium sp. ZX09. The salt-tolerant strain was isolated from a soil sample in our laboratory and the 16S rDNA sequence was deposited in the GenBank database under the accession number GU810841 . Salecan is suitable to fabricate hydrogel for biomedical applications due to the excellent hydrophilicity and biocompatibility. Here, salecan has been introduced into poly(N-isopropylacrylamide) (PNIPAm) network to form novel thermo-sensitive semi-interpenetrating polymer networks (semi-IPNs). The structure of salecan/PNIPAm semi-IPNs was confirmed by Fourier transformation infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Thermogravimetric analysis (TGA) proved the stability of the semi-IPNs. Rheological and compressive tests revealed an elastic solid-like behavior and good mechanical properties of the hydrogels. Swelling behavior test showed the hydrogels possessed high water content at room temperature. An excellent thermo-sensitive property of fast response rates to temperature had been demonstrated as well. In vitro degradation measurements ensured the semi-IPNs were degradable. Cytotoxicity and cell adhesion study suggested the synthesized salecan/PNIPAm hydrogels were non-toxic and biocompatibility. The results indicated the novel thermo-responsive hydrogels could be a suitable candidate for biomedical applications.
研究领域:
材料科学
·
生物医学工程
·
高分子化学
·
生物技术
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Yongyan Yang,Ying Ma,Jingfei Wang,Ruiting Zhang,Meiyi Wu,Shuangling Zhong,Wenqi He,Xuejun Cui
As a new type of wound dressing, hydrogels have attracted more and more attention. However, traditional hydrogel wound dressings lack inherent antibacterial properties and are difficult to match irregular wounds, which leads to an easy wound bacterial infection. To solve the problems associated with traditional hydrogels, in this research, a thermosensitive hydrogel (PFLD) for wound dressings was developed based on Poloxamer 407 (PF127), lysine (Lys), and 3,4-dihydroxyphenylacetic acid (DOPAC). Rheological tests indicated that the PFLD hydrogel possesses injectability, adaptability to deformation, and sufficient mechanical strength for wound dressing applications. In addition, it could in situ gel at 33 °C, which indicated that the hydrogel could undergo sol-to-gel transition under body temperature. Upon using it in wound treatment, it could adapt to irregular wounds to achieve full coverage of the wound and promote the rapid hemostasis of wound bleeding. Due to the presence of DOPAC in the hydrogel, it exhibited excellent antibacterial and antioxidant properties on the wounds. The skin defect model showed that the wound shrinkage was the fastest after PFLD hydrogel treatment. On day 14, the wound shrinkage rates were 81.68 and 99.77% for the control and PFLD hydrogel groups, respectively. Therefore, the PFLD hydrogel has a broad application prospect as a dressing for the treatment of irregular wounds.
研究领域:
材料科学
·
生物医学工程
·
药剂学
·
伤口护理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2019
·Vol. 43
·期 12
·4757-4764
·
IF 3.069
Yunfan Yin,Qianghua Wu,Qingxian Liu,Longchao Du
The greenhouse gas carbon dioxide was converted to an oligomeric poly(propylene carbonate)-diol by a high activity salen–Co(III) catalyst. The new mussel biomimetic hydrogel was synthesized by the reaction of poly(propylene carbonate)-diol with 1,6-hexamethylene diisocyanate followed by lysine dopamine as a chain extender. DSC tests indicate that the hydrogel has two Tg peaks, and they gradually become compatible upon increasing the molecular weight of poly(propylene carbonate)-diol. The TGA curve shows that the hydrogel gradually degrades with the degradation of the dopamine side chain, the poly(propylene carbonate) backbone and the polyurethane backbone. UV-vis spectroscopy showed that when mixed with Fe3+, Fe3+ has different complex numbers with the hydrogel at different pH values, accompanied with color changes. Rheological tests show that the stronger the alkalinity, the greater the elastic modulus of the hydrogel. SEM confirmed the cross-linking structure of the hydrogel. The numerous catechol groups impart good cell affinity and bio-tissue adhesion to the hydrogel and promote tissue adhesion and integration. By using CO2, the biomimetic material can reduce greenhouse gas emissions, which will have broad application prospects.
研究领域:
材料科学
·
化学工程
·
环境科学
·
生物材料
✓ 已验证
产品关联
DOI
高影响因子
Soft Matter
·
2022
·Vol. 18
·期 14
·2814-2828
·
IF 4.046
Xian-hui Shao,Xiao Yang,Yue Zhou,Qing-chang Xia,Yun-ping Lu,Xiao Yan,Chen Chen,Ting-ting Zheng,Lin-lin Zhang,Yu-ning Ma,Yu-xia Ma,Shu-zhong Gao
Making a hydrogel-based first-aid bandage with green resources, desirable biocompatibility, universal adhesive properties, low cost and simple production is a long-standing research aspiration. Considering this, three naturally existing organic acids, namely tannic acid, thioctic acid and phytic acid, were used to construct a novel adhesive gel (TATAPA hydrogel) for epidermal tissue bandage applications. This hydrogel could be synthesized under mild conditions with no need for a freeze–thawing shaping procedure, and was transparent, moldable and stretchable with good stability under continuous water immersion. In lap-shear tests, the TATAPA hydrogel could adhere to various hydrophilic and hydrophobic surfaces. Moreover, in the case of skin tissue adhesion, the hydrogel could be easily peeled off from the skin, meeting wearability requirements. Rheological tests showed that the hydrogel possessed thermal sensitive properties derived from multi-supramolecular interactions. The methicillin-resistant Staphylococcus aureus (MRSA)-infected burn wound test demonstrated that the hydrogel had desirable antibacterial activity and was beneficial for wound healing. A femoral artery bleeding assay was also used to reveal that the TATAPA hydrogel could be directly pasted onto the bleeding site for hemostasis. Overall, this hydrogel demonstrates potential as a surgical bioadhesive for a broad range of medical applications.
研究领域:
材料科学
·
生物医学工程
·
伤口护理
·
药剂学
✓ 已验证
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yu Cai,Chao Liu,Kaihua Gong,Hui Li,Haoyuan Song,Yang Zhang,Dawei Ding,Jie Liu,Jianpeng Guo,Liang Fang
Low adhesion to skin remains a significant challenge for most hydrogel based transdermal drug delivery systems. Meanwhile, most of the methods to improve bio-adhesion often ignore the effect of the cohesion. Inspired by the adhesion mechanism of natural mussels and the synergistic balance theory based on cohesion and adhesion, we designed a poly (acrylamide- co -hydroxyethyl acrylate)-polydopamine-polyvinylpyrrolidone (PAHDP) quaternary composite hydrogel to enhance the cohesion and adhesion through the synergistic effect of multiple hydrogen bonds to achieve strong bio-adhesion to skin. The structure of PAHDP was characterized by FTIR, 1 H NMR, SEM and TGA . The peeling adhesion force of PAHDP on porcine skin was improved by 9-fold compared with PAH hydrogel. At the same time, the adhesion force of drug-loaded PAHDP was 1.3 times that of Voltaren® EX . The rheological test further demonstrated that the synergistic hydrogen bonding can significantly improve the PAHDP cohesion. In addition, in vitro release, skin permeation and pharmacokinetics test of PAHDP hydrogel containing diclofenac sodium (DIC) showed that monomer dopamine (DA) could promote drug release. FTIR and molecular modeling were utilized to further demonstrate the enhanced drug release mechanism of DA. MTT assay, H&E staining and skin erythema analysis demonstrated that PAHDP was non-irritant to the skin. In conclusion, the innovatively prepared PAHDP hydrogel exhibits high skin adhesion, excellent mechanical properties, non-irritation and high drug release ability. This study also provides a simple and efficient strategy and theoretical basis for the preparation of high adhesion and high drug release hydrogels for transdermal drug delivery system.
研究领域:
材料科学
·
药学
·
生物医学工程
·
药物递送系统
✓ 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）