JOURNAL OF APPLIED POLYMER SCIENCE
·
2020
·Vol. 137
·期 37
·49118
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IF 2.52
Chunhui Luo,Ning Wei,Xinxin Sun,Faliang Luo
Developing hydrogels with excellent mechanical performances and multiple functions is challenging. Herein, polyvinyl alcohol (PVA) and grape seed extracted polymer (GSP) were used to achieve this goal. The hydrogel was firstly cross-linked by crystalline regions of PVA upon freezing–thawing cycles, it was further immersed in ammonium sulfate (AS) solution to induce the hydrophilic to hydrophobic transition of GSP. The relationship between microstructures and mechanical properties of the obtained PVA–GSP hydrogel was revealed. The results showed that the PVA–GSP precursor hydrogels were weak due to the uneven network and lower cross-link density. After soaking in ammonium sulfate solution, the network became more dense and uniform because of the hydrophilic to hydrophobic transition of GSP. Meanwhile, frictions between polymer chains increased. As a result, ultra-strong (tensile stress = 20.5 MPa), antifatigue (>95%), self-healable (healed stress = 10.0 MPa), and conductive hydrogels were obtained. The strength and toughness of our gel are among top values in literature to date. Furthermore, the swollen gel even after soaking in DI water for 36 hr still maintained tensile strength at the megapascal level, superior to most water-rich hydrogels. This tough and functional gel might find potential applications in cartilage repair, artificial skin, and sensors.
研究领域:
材料科学
·
生物医学工程
✓ 已验证
产品关联
DOI
高影响因子
BIORESOURCE TECHNOLOGY
·
2021
·
IF 9.642
Yuxi Zheng,Tianyuan Zhang,Yun Lu,Li'ao Wang
Ultra-high-strength liquor wastewater (UHS-LWW) is rich in organic matter, and the required treatment is expensive. Here, an extremophilic strain Monascus pilosus YX-1125 was isolated for the direct conversion of UHS-LWW to short-chain fatty acids (SCFAs). Strain YX-1125 is an efficient SCFA producer with carbohydrate metabolic flexibility under multiple-stress conditions. Moreover, strain YX-1125 could tolerate up to 75 g/L, 100 g/L, and 50 g/L of ethanol, organic acids, and salt, respectively, without inhibition. In repeated-cycle fermentations, 17.8 g/L of butyric acid and 2.0 g/L of propionic acid were produced from UHS-LWW at the fifth cycle, which are the highest concentrations of wastewater-derived SCFAs reported to date. After SCFA recovery, a 98.9% COD reduction was achieved, which is estimated to reduce treatment costs by 91.7%. Results indicate that M. pilosus YX-1125 is a promising strain for the direct treatment of UHS-LWW, and for converting it into valuable biochemicals without any pre-treatment.
研究领域:
微生物学
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环境科学
·
生物技术
✓ 已验证
DOI
高影响因子
Science Advances
·
2024
·Vol. 10
·期 30
·
IF 11.7
Jianfu Tang,Lianping Wu,Xueqin Fan,Xiaofei Dong,Xueqi Li,Yanjun Xie,Jian Li,Jiancun Rao,Teng Li,Wentao Gan
Constructing a crystalline-amorphous hybrid structure is an effective strategy to overcome the conflict between the strength and toughness of materials. However, achieving such a material structure often involves complex, energy-intensive processing. Here, we leverage the natural wood featuring coexisting crystalline and amorphous regions to achieve superstrong and ultratough wood paper (W-paper) via a dual-phase nanostructure regulation strategy. After partially removing amorphous hemicellulose and eliminating most lignin, the treated wood can self-densify through an energy-efficient air drying, resulting in a W-paper with high tensile strength, toughness, and folding endurance. Coarse-grained molecular dynamics simulations reveal the underlying deformation mechanism of the crystalline and amorphous regions inside cell walls and the failure mechanism of the W-paper under tension. Life cycle assessment reveals that W-paper shows a lower environmental impact than commercial paper and common plastics. This dual-phase nanostructure regulation based on natural wood may provide valuable insights for developing high-performance and sustainable film materials.
研究领域:
材料科学
·
生物学
·
环境科学
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产品关联
DOI
PubMed
高影响因子
Advanced Healthcare Materials
·
2022
·Vol. 12
·期 3
·2201799
·
IF 11.092
Congying Wei,Weili Shi,Chuangqi Zhao,Shuai Yang,Jiajia Zheng,JinPan Zhong,Tianyi Zhao,Simin Kong,Xi Gong,Mingjie Liu
Injectable hydrogels have recently emerged as alternatives to sutures for various clinical indications. However, existing injectable hydrogels are unsuitable for hemostasis in minimally invasive surgery because of their weak interfacial adhesion and complex/prolonged processing. Herein, a superwetting injectable hydrogel composed of oppositely charged polysaccharides is developed. The spontaneous spreading of the injectable hydrogel on the surfaces achieves complete wetting and forms tight interfacial contact by absorbing the interfacial water. The superwetting ability and subsequent covalent crosslinking perform fast and ultrastrong wet adhesion (140 kPa) on the tissue surface. Ex vivo porcine and in vivo rat models show that the hydrogel successfully leads to the aggregation of erythrocytes for targeted hemostasis (in less than 12 s) without requiring external adjuncts, and no postsurgical adhesions to the peripheral tissues. This further demonstrates that hydrogel can act as an effective hemostasis agent in laparoscopic surgery in a rabbit model. Overall, the strong wet adhesion, antibacterial properties, and easy operability make this injectable hydrogel a promising candidate for hemostasis applications, as it can successfully combine clinical efficacy and transformation opportunities for minimally invasive surgery.
研究领域:
生物医学工程
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材料科学
·
外科手术
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止血
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产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Yongliang Ding,Chengxin Zhang,Bingbing Shi,Yiyun Wang,Pengfei Tang,Cheng Liu,Jingjing Fan,Zhongkai Wang,Feng Jiang
Degradable polymers typically require prolonged exposure to harsh conditions for degradation, but this extended duration and severe treatment often result in incomplete breakdown, leading to the formation of harmful microplastics that pose significant environmental pollution risks. In this work, degradable alternating polyamide hard segments and soft crystallizable segments were combined by amide groups to design thermoplastic bio-based polyesteramide elastomers (PEAEs) with customizable properties and rapid degradability. The hard segment of the polymer features an alternating arrangement of amide and ester bonds. This arrangement facilitates the formation of small molecule monomers when the ester bond is broken, preventing microplastic contamination that may arise from incomplete degradation of the hard segment. Additionally, the inclusion of side groups in the soft segment disrupts the crystallization, enhancing its susceptibility to solvent penetration and thereby accelerating the degradation rate. After step-cyclic tensile tests, additional physical cross-linking points were formed in PEAEs to enhance their mechanical strength and elasticity. Furthermore, PEAEs demonstrated outstanding processing capabilities, including compounding, extrusion, pelletization, and spinning. This innovative approach introduces fresh design concepts for the industrial application of bio-based degradable polymers, playing a pivotal role in advancing resource conservation and environmental protection.
研究领域:
材料科学
·
聚合物化学
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环境科学
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生物降解材料
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可持续工程
✓ 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）