POLYMER
·
2024
·
IF 4.1
Tiancheng Dai,Chao Yi,Shuohong Dong,Mingjie Zhang,Chao Long,Zhen Li,Wenkai Liu,Feng Luo,Jiehua Li,Hong Tan
This study incorporated polydimethylsiloxane (PDMS) and a kind of siloxane-based chain extender (SDO) into polyether urethanes (PEU). The correlation between microphase separation structure and mechanical properties, surface properties and wear resistance were investigated using multiple characterization techniques such as DSC , DMA , SAXS, ATR-FTIR, and XPS . The addition of PDMS significantly reduced the friction coefficient of PEU and enhances the hydrophobicity . The addition of SDO helped to improve the compatibility between PDMS and hard segments of PEU as proved by the fact that the glass transition temperatures of PDMS segments were shifted to higher temperatures and the fraction of loosely hydrogen-bonded carbonyls increased. Due to the improved interfacial adhesion between the immiscible segments, the wear resistance of PEU modified by both PDMS and SDO was obviously enhanced.
研究领域:
材料科学
·
表面化学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2020
·
IF 3.573
Jianan Cai,Zhipeng Liu,Bo Cao,Xiaoxiao Guan,Shumei Liu,Jianqing Zhao
Simultaneously improving the mechanical properties and processability of polyamide-6 (PA6) by chain extension in melting extrusion is usually very difficult. To address this issue, a novel small-molecule triepoxy chain extender (D1) is designed, synthesized, and used to modify PA6. The rheological measurements show that the shear viscosity of PA6 containing 2 wt % D1 decreases by 52.2% compared with that of the original PA6 at a shear rate of 1000 s–1, which is in the shear rate range of thermoplastic processing in the industry. This interesting result is attributed to the generation of a long-chain-branched structure of the macromolecular chains of chain-extended PA6, which reduces the power-law index and aggravates the shear-thinning behavior of the PA6 melt. In addition, the corresponding notched impact strength increases from 62.4 to 105.9 J/m. As a result, this work provides a feasible way to prepare PA6 with excellent mechanical properties and processability in industrial production.
研究领域:
材料科学
·
高分子化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
·
2025
·
IF 7.3
Jinrui Hu,Xiao Xu,XinYi Cao,Lulu Dong,Lixia Bao,Weibo Kong,Jiliang Wang
The recycling of poly(ethylene terephthalate) (PET) is vital for environmental sustainability, yet achieving recycled PET (rPET) and its composites with optimal processability and flexibility remains a challenge. This study presents a solvent-free reactive extrusion method to extend the chains of rPET using a macromolecular chain extender (i.e., methyl methacrylate-glycidyl methacrylate copolymer, marked as PMG) rich in epoxy groups and to produce rPET/recycled polyethylene (rPET/rPE) composites. The resulting composites exhibit excellent thermoplasticity and controllable mechanical properties, such as the rPET/rPE composite (70:30 by mass), with a tensile strength of 39.2 MPa and an elongation at a break of 81.4%. After five extrusion cycles, their mechanical properties just encounter a subtle decline, indicating robust sustainability and cycle performance. The formation of a dynamic physical cross-linking network arises from the distinct polarity, hydrophobicity, and melt viscosity of rPET and rPE, where the hard spherical rPET phase is evenly dispersed in the soft rPE matrix with PMG acting as an interfacial compatibilizer. This innovative approach not only enhances the properties of the recycled composites but also promotes their cost-effectiveness and environmental benefits, thus broadening the potential applications of rPET and rPE as partial substitutes for virgin PET and PE.
研究领域:
材料科学
·
环境科学
·
聚合物工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry B
·
2025
·
IF 5.7
Qianshu Wang,Wenbo Luan,Xiaodong Sui,Qi Sun,Mengyu Zhang,Longhai Guo,Jun Ye,Teng Qiu,Xinlin Tuo
The integration of self-healing properties into waterborne polyurethane (WPU) represents a significant advancement in materials chemistry. However, the practical application of self-healing WPU is often hindered by its compromised toughness, flexibility, and water resistance, as well as the challenges accompanied by complex production processes and high manufacturing costs. In this study, we propose a novel network optimization strategy that leverages the synergistic effects of multiple lateral hydrogen bonds from amide (A)–urea (U) motifs, hydrophobic aggregation of non-crystalline flexible alkyl segments, branched topology, and intrinsic intermolecular interactions within WPU. This strategy is implemented through a straightforward, stepwise chain extension synthesis of WPU, incorporating a biomass-derived chain extender (CA) designed from the condensation of cost-effective dimer acid and pentylenediamine. Remarkably, the optimized WPU exhibited bio-elastic tissue-like properties, including self-healing capability, high strength, toughness, ductility, low modulus and minimal water absorption. The self-healed material, derived from recycled film fragments, achieves an ultimate tensile strength of 41.4 MPa and an elongation at break of 1040%, with no significant stiffening or loss of elasticity. Additionally, the material demonstrated excellent interfacial adhesion, conductivity and strain sensitivity, making it suitable for use as a conductive elastomer. Furthermore, when plasticized with electrolytes, the material exhibited room-temperature self-healing within the conductive network, providing broad potential for applications in flexible electronics and related fields.
研究领域:
材料科学
·
化学工程
·
生物医学工程
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DOI
PubMed
高影响因子
ACS Applied Polymer Materials
·
2025
·
IF 4.7
Yanna Zhao,Yiqing Li,Shuai Yang,Yingying Zhang,Xiaowei Bai
This study reports on a polyurethane nanocomposite containing dynamic borate bonds (containing boron and nitrogen endocoordination) with three different nanoparticles as reinforcing fillers. First, a bis-boron nitrogen coordinated borate ester bonded diol (TB–OH) was synthesized and introduced into the polyurethane prepolymer as a chain extender, followed by the addition of a cross-linking agent to form a reticulated cross-linking structure, and finally, the nanoparticles were dispersed into the polymer matrix by the blending method. Among them, the TB-Ca sample had a maximum tensile strength as high as 15.23 MPa, which was 529% higher than that of TB-0, and the Td5% experienced an elevation from 234 to 275 °C. It also showed excellent self-healing performance, achieving a self-healing rate of 83.53% and up to 12.69 MPa when repaired.
研究领域:
材料科学
·
高分子化学
·
纳米技术
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS RESEARCH
·
2021
·Vol. 36
·期 15
·3134-3144
·
IF 3.089
Chang Beizhe,Li Yingchun,Wang Wensheng,Song Gang,Lin Jing,Murugadoss Vignesh,Naik Nithesh,Guo Zhanhu
To improve comprehensive properties of poly(butylene adipate-co-terephthalate) (PBAT), especially thermal stability, reactive extrusion method was used to modify PBAT. Branch and micro cross-linking structure of PBTA was produced with hexanediol diglycidyl ether (HDGE), polyethylene glycol diglycidyl ether (PEGDGE), and styrene–methyl methacrylate–glycidyl methacrylate terpolymer (KL-E4370) as the chain extender (CE), demonstrated through differential scanning calorimeter, Vicat softening point testing (VSP), gel permeation chromatography, rheological measurement, and scanning electron microscopy. The molecular weight, the complex viscosity, and the viscoelasticity of modified PBAT were improved by increasing the CE molecular weight. The crystallization temperature and VSP were also increased. Meanwhile, it showed that the hydrolysis resistance of PBAT was improved and its degradation performance was decreased. Furthermore, when KL-E4370 was added, PBAT has the best comprehensive performance. Graphic abstract
研究领域:
材料科学
·
高分子化学
✓ 已验证
DOI
高影响因子
Polymer Chemistry
·
2025
·
IF 3.9
Xu Han,Le Chang,Zeqian Wang,Xinfang Zhang,Feng Liu
Silicon side chain modification is an effective way for improving solvent resistance of one-component polysulfide adhesives, but the introduction of silicon side chains decreases hydrogen bonding interactions, leading to some reduction in initial mechanical properties. Based on the silicon modification, inserting more hydrogen bonding sites into a system is a viable approach to solving the above problems. In this work, a series of novel silicon side chain-modified one-component polysulfide adhesives (Sis-OCPSs) were successfully prepared using chain extenders in different proportions: 1,4-butanedithiol (BSO) and 1,3-bis(trimethylsilyl)urea (BSU). As expected, the CO groups and dual silicon side chains in BSU provide more active sites and silicon content, effectively reinforcing mechanical properties and solvent resistance. The optimal overall performance was obtained when the mass ratio of BSO and BSU was 8 : 1. Compared to silane side chain modification (Si-OCPS3) and before modification (Sis-OCPS0), Sis-OCPS3 exhibited the highest tensile strength, elongation and shear strength of 23.75 ± 0.34 MPa, 439.03% and 4.72 ± 0.27 MPa, respectively. Moreover, the tensile strength of Sis-OCPS3 could still reach 20.86 ± 0.29 MPa and 19.04 ± 0.27 MPa after immersion in oil and water for 21 d. We believe our paradigm can offer a feasible approach for designing high-performance one-component polysulfide adhesives.
研究领域:
高分子材料科学
·
胶粘剂化学
·
功能改性材料
·
有机合成化学
·
材料耐久性
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2013
·Vol. 130
·期 4
·2345-2351
·
IF 1.395
Chao Zhou,Bo Wang,Fengtao Zhang,Kun Xu,Changyu Han,Hong Hu,Yanpin Liu,Pixin Wang,John H. Xin
A novel kind of impact protective material, named as impact protective micro-gel (IPM), was synthesized via a precipitation copolymerization of a compound containing boron and silanol. Diphenylmethane diisocyanate (MDI) was introduced as the chain extender to enhance its impact protective performance. Its rheological properties and morphology were investigated. Three-dimensional (3D) spacer warp-knitted fabrics were dip-coated with the IPM made with and without use of MDI, and the impact protective performance of 3D finished fabrics was assessed by drop impact tests. The results show that the adjustment of the MDI content can adjust the real cross-linking density of the IPM due to the entanglement of polymer chains, and an appropriate cross-linking density can endow dilatant properties to the IPM samples. The results also show that the impact protective performance of 3D spacer fabrics finished with the IPM can be significantly improved. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 130: 2345–2351, 2013
研究领域:
高分子材料科学
·
纺织工程
·
防护材料
·
流变学
·
功能材料
✓ 已验证
DOI
高影响因子
POLYMER
·
2025
·
IF 4.5
Weijie Li,Ruibin Mo,Weiwei Liu,Xiang Jiang,Xinya Zhang
Moisture-curable polyurethane (MCPU) is widely utilized but is often limited by poor mechanical properties caused by environmental damage. In this work, a high-strength MCPU with exceptional self-healing properties was fabricated by incorporating two chain extenders containing aromatic disulfide bonds and hydrazide groups. The formation of multiple hydrogen bonds among acylsemicarbazide(ASCZ) groups, generated through the reaction between hydrazide and isocyanate, significantly enhances the microphase separation structure and mechanical properties. The optimized MCPU achieves a tensile strength of 20.43 MPa and an elongation of 2071.57 %, representing 4.93-fold and 5.92-fold improvements over the relevant ASTM D6947/D6947-16 standards (4.14 MPa and 350 %), respectively. Furthermore, the optimized MCPU exhibits a remarkable self-healing properties attributed to the dynamic exchange of disulfide bonds, which facilitates molecular chain rearrangement. This work presents an innovative strategy for designing MCPU materials with superior mechanical and self-healing properties, paving the way for advanced applications in durable and sustainable materials.
研究领域:
材料科学
·
高分子化学
·
自修复材料
·
机械工程
✓ 已验证
产品关联
DOI
高影响因子
MOLECULES
·
2019
·Vol. 24
·期 23
·4317
·
IF 3.06
Wei Hu,Lei Wang,Quanyong Wang,Anbo Luan,Yuliang Mai,Linjia Huang,Yongjun Chen,Shijing Yan,Wenjie Xiong
The high crystallization at room temperature and high cost of polyoxytetramethylene glycol (PTMG) have become obstacles to its application. To overcome these problems, a segment of PTMG can be incorporated into a block copolymer. In this work, polypropylene (PPO) glycol-polyoxytetramethylene (PPO-PTMG) multiblock copolymers were designed and synthesized through a chain extension between hydroxyl (OH)-terminated PPO and PTMG oligomers. The chain extenders, feed ratios of the catalyst/chain extender/OH groups, reaction temperature, and time were optimized several times to obtain a PPO-PTMG with low crystallization and high molecular weight. Multiblock copolymers with low crystallization and high average molecular weight (Mn= 1.0–1.4 × 104Dalton) were harvested using m-phthaloyl chloride as the chain extender. The OH-terminated PPO-PTMG multiblock copolymer with highMnand a functionality near two was further siliconized by 3-isocyanatopropyltrimethoxysilane to synthesize a novel silyl-terminated polyether. This polyether has an appropriate vulcanizing property and potential applications in sealants/adhesive fields.Keywords:polypropylene glycol-polyoxytetramethylene glycol block multicopolymers;chain extender;m-phthaloyl chloride;adhesives;structure optimizing
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
危险品化学品经营许可证（带存储）