CHINESE JOURNAL OF POLYMER SCIENCE
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2019
·Vol. 38
·期 1
·72-83
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IF 2.804
Han Yue,Tang Dong-Hao,Wang Guang-Xing,Sun Ya-Nan,Guo Ying,Zhou Heng,Qiu Wen-Feng,Zhao Tong
Vanillin was used as sustainable source for phthalonitrile monomer synthesis, and allyl/propargyl ether moieties were introduced to improve the processability at the minimal cost of thermal properties. The synthesis route was optimized to minimize side-reactions and simplify post-processing, and the monomers were obtained in high purity and good yields. The curing behavior, mechanism, and processability of the monomers were studied, and the thermal properties of cured polymers were evaluated. Of the two monomers, the allyl ether-containing one exhibited a wide processing window of 185 °C, and was mainly cured into phthalocyanine and linear aliphatic structures through self-catalytic curing process. Also, the glass transition temperature was higher than 500 °C. In contrast, the propargyl ether-containing monomer could only be partially cured, and heat resistance was found to be compromised. Compared with traditional petroleum-based phthalonitrile resins, the bio-based monomers could be cured without the addition of catalysts, and improvement in processability was achieved at no cost of thermal performances.
研究领域:
材料科学
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高分子化学
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可持续材料
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有机化学
✓ 已验证
产品关联
DOI
高影响因子
Additive Manufacturing
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2022
·
IF 11.632
Lifu Lin,Haidong Wu,Peishen Ni,Yong Chen,Zhaoquan Huang,Yehua Li,Kunji Lin,Pengfei Sheng,Shanghua Wu
Improved heat dissipation performance, by way of thermal management, is critical in many engineering applications . In this study, three types of silane coupling agents were used to modify aluminum nitride (AlN) powder for vat photopolymerization . The effect of silane coupling agents on the rheology, stability, and curing behavior were systematically studied. The results showed that, compared with two other types of silane coupling agents, one silane agent (KH570) had a larger positive effect on the rheology and stability of the AlN suspension, and the absorbance of the AlN powder increased after surface modification. In addition, the effects of different solid loadings on the curing behavior and C C double-bond conversion rate were systematically investigated. It was found that a higher solid loading resulted in a lower curing depth, cure width, and C C double-bond conversion rate. For the sintered AlN components with increased solid loading, the shrinkage decreased while both the flexural strength and thermal conductivity increased. In addition, the shrinkage in the Z-direction was higher than that in the X- and Y-directions. Scanning electron microscopy analysis showed that the mean grain size decreased with increasing solid loading. Furthermore, a heat dissipation performance evaluation system was designed to illustrate the heat transmission capacity of AlN ceramics . Simulation and experimental results showed that AIN ceramic parts with complex shapes achieved better heat-dissipation performance than those with simple shapes.
研究领域:
材料科学
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热工程
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增材制造
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陶瓷科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Sustainable Chemistry & Engineering
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2018
·
IF 6.14
Qiong Wu,Yun Hu,Jijun Tang,Jing Zhang,Cuina Wang,Qianqian Shang,Guodong Feng,Chengguo Liu,Yonghong Zhou,Wen Lei
Novel soybean-oil-based (SBO-based) epoxy acrylate (EA) resins were developed via ring-opening reaction of epoxidized soybean oil (ESO) with hydroxyethyl methacrylated maleate (HEMAMA) precursor, a synthesized unsaturated carboxylic acid having two active C═C groups and a side methyl group. Experimental conditions for the synthesis of the precursor and the SBO-based EA (ESO-HEMAMA) product were studied, and their chemical structures were confirmed by FT-IR, 1H NMR, 13C NMR, and gel permeation chromatography. Subsequently, the volatility of HEMAMA was studied and compared with acrylic acid (AA). Furthermore, gel contents and ultimate properties of the UV-cured ESO-HEMAMA resins were investigated and compared with a commercial acrylated ESO (AESO) resin. At last, UV-curing behaviors of the SBO-based EA resins were determined by real-time IR. It was found that the HEMAMA precursor showed much lower volatility than AA, and the optimal pure ESO-HEMAMA resin possessed a C═C functionality up to 6.02 per ESO and biobased content of 65.4%. Meanwhile, the obtained ESO-HEMAMA biomaterials exhibited much superior properties as compared to the AESO resin. For instance, the obtained pure ESO-HEMAMA material possessed a storage modulus at 25 °C of 1.00 GPa, glass transition temperature (Tg) of 70.1 °C, and tensile strength and modulus of 13.4 and 592.1 MPa, which were 9.4, 3.6, 6.9, and 15.7 times the values of the pure AESO material, respectively. The resulting biomaterial with 30% of hydroxyethyl methacrylate diluent even reached a tensile strength of 28.4 MPa and Tg of 89.0 °C. Therefore, the developed SBO-based EA resins are very promising for applications in UV-curable coatings.
研究领域:
材料科学
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化学工程
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高分子化学
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涂料技术
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART B-ENGINEERING
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2018
·
IF 4.92
Ruisong Li,Yucang Zhang,Zengheng Xiong,Fengyi Zheng,Fanrong Meng
A typical method of synthesizing epoxy composites is to incorporate diglycidyl ether of bisphenol-A (DGEBA) into a bio-based epoxy resin. In this strategy, pure liquefied biomass is typically used as feedstock and is blended with DGEBA. Liquefied banana pseudo stem (LBPS), a bio-based active mixture obtained by liquefaction with phenol as the solvent, was directly utilized without depuration or additional DGEBA to develop a composite blend epoxy resin (cb-LBPSER). The blending process based on an incorporation of phenol-based epoxy resin (PER) was investigated by Fourier transform infrared spectroscopy, gel permeation chromatography , and thermogravimetric analysis . The cb-LBPSER presented a lower molecular weight and an improvement of 38.45% for shear strength than the pure LBPS-based epoxy resin (LBPSER). Also, the cured cb-LBPSER adhesive displayed a thermal stability comparable to that of PER. In addition, the curing behaviour, the activation energy , and the glass transition temperature were analyzed by diffrential scanning calorimetry and dynamic mechanical analysis . The blend bio-based epoxy composites exhibited an improved performance, confirming its potential as a suitable alternative to commercial PER.
研究领域:
材料科学
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化学工程
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高分子科学
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生物复合材料
✓ 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）