CHEMICAL ENGINEERING JOURNAL
·
2017
·
IF 6.216
Shiyuan Chen,Junheng Zhang,Jiliang Zhou,Daohong Zhang,Aiqing Zhang
A novel hyperbranched polymeric ionic liquid (HBP-AMIM + PF6 − ) was explored via a thiol-ene click reaction using thiol-ended hyperbranched polyesters (THBP) and 1-allyl-3-imethylimidazolium hexafluorophosphate (AMIMPF6). The effects of HBP-AMIM + PF6 − on the curing behavior, mechanical properties and thermal stability of benzoxazine/epoxy thermosets were investigated. The gelation time and differential scanning calorimetry of non-isothermal analysis indicated that the addition of HBP-AMIM + PF6 − significantly decreased the curing temperature of benzoxazine/epoxy thermosets. Simultaneously, the addition of HBP-AMIM + PF6 − also improved the strength, toghness and thermal properties of benzoxazine-epoxy thermosets. The addition of 3 wt% HBP-AMIM + PF6 − -2 could significantly improve the mechanical and thermal performance of thermosets compared with that of cured neat benzoxazine/epoxy resin. The tensile strength, tensile toughness, flexural strength and flexural modulus, impact strength of the thermosets were improved by about 76.6%, 279.3%, 57.8%, 22.3% and 80.4%, respectively, compared with those of cured neat resin. The toughening mechanisms was attributed to the “in situ” reinforcing and toughening mechanism.
研究领域:
高分子材料
·
材料科学
·
热固性树脂
·
复合材料
·
高分子化学
·
功能材料
✓ 已验证
DOI
高影响因子
JOURNAL OF POLYMER SCIENCE PART A-POLYMER CHEMISTRY
·
2015
·Vol. 54
·期 3
·368-380
·
IF 3.113
Jingang Li,Yixin Xiang,Sixun Zheng
In this contribution, we reported the synthesis of a hyperbranched block copolymer composed of poly(ε-caprolactone) (PCL) and polystyrene (PS) subchains. Toward this end, we first synthesized an α-alkynyl- and ω,ω′-diazido-terminated PCL- b -(PS) 2 macromonomer via the combination of ring-opening polymerization and atom transfer radical polymerization. By the use of this AB 2 macromonomer, the hyperbranched block copolymer ( h -[PCL- b -(PS) 2 ]) was synthesized via a copper-catalyzed Huisgen 1,3-dipolar cycloaddition (i.e., click reaction) polymerization. The hyperbranched block copolymer was characterized by means of 1 H nuclear magnetic resonance spectroscopy and gel permeation chromatography. Both differential scanning calorimetry and atomic force microscopy showed that the hyperbranched block copolymer was microphase-separated in bulk. While this hyperbranched block copolymer was incorporated into epoxy, the nanostructured thermosets were successfully obtained; the formation of the nanophases in epoxy followed reaction-induced microphase separation mechanism as evidenced by atomic force microscopy, small angle X-ray scattering, and dynamic mechanical thermal analysis. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2016 , 54 , 368–380
研究领域:
高分子化学
·
材料科学
·
纳米结构功能材料
·
聚合物自组装
·
热固性树脂改性
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2018
·
IF 3.741
Yue Han,Donghao Tang,Guangxing Wang,Ying Guo,Heng Zhou,Wenfeng Qiu,Tong Zhao
Low melting phthalonitrile monomers containing allyl and/or methoxyl groups were designed, synthesized and characterized. In order to evaluate their potential application in phthalonitrile resins, these monomers were blended with 1,3-bis(3,4-dicyanophenoxy)benzene and 4-(4-aminophenoxy)phthalonitrile, then cured into polymers. Curing mechanisms of different prepolymers were proposed and compared, and processability, thermal and mechanical properties were characterized. The introduction of methoxyl units was found to postpone the curing, and thermal properties were slightly compromised. On the contrary, the usage of allyl was beneficial to both processability and thermal properties. More importantly, the impact strength for allyl-containing polymers could be as high as 13.63 kJ m −2 , indicating such resin could be applied as high temperature structural composite matrices.
研究领域:
高分子化学
·
材料科学
·
复合材料
·
热固性树脂
·
高性能聚合物
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2022
·Vol. 139
·期 24
·52368
·
IF 3.057
Xiongfei Zhang,Tianhui Zhao,Ting Cao,Peiyu Liu,Chuang Ma,Pengyun Li,Dang Huang
In this paper, bisphenol A (BPA), epichlorohydrin (ECH), and isocyanate trimer (TDI-T) are used as raw materials to synthesize a high toughness/trimer epoxy resin by graft copolymerization. It was cured at room temperature with low molecular weight polyamide 650 (PA650)/isophorone diamine (IPDA) and low molecular weight polyamide 650/triethylene tetramine (TETA) composite curing system respectively. The cured products of the two compound systems were studied by Fourier transform infrared spectroscopy (FT-IR), differential scanning calorimetry (DSC), thermogravimetry (TG), and mechanical property testing. The results show that with the increase of TETA and IPDA curing agents, the heat released during the curing process of the two systems also greatly increases, and the temperature rises from the initial 33.9–69.7°C and 52.8°C. The curing time is shortened from a few days to a few hours, and the controllability of the curing time is effectively realized. When the ratio of triethylene tetramine to low molecular weight polyamide 650 is 2.86:100, the compressive strength is the best, reaching 112.7 MPa, 12% higher than pure polyamide as curing agent, and the specimen can be completely restored to its original shape in a few minutes. When the ratio of TETA to PA650 is 2.86:100, the elongation at break reaches 21.4%.
研究领域:
高分子化学
·
材料科学
·
复合材料
·
热固性树脂
·
功能材料
✓ 已验证
DOI
高影响因子
EUROPEAN POLYMER JOURNAL
·
2017
·
IF 3.531
Lei Zhang,Yong Yang,Yingxin Chen,Hongwei Lu
Main-chain benzoxazine oligomers can be phenol-capped now. In this article, cardanol, a renewable phenol extracted from agricultural byproduct, is designed as the capping agent for the oligomers. Benefiting from the long alkyl chain of cardanol, the oligomers possess good processability to satisfy resin transfer molding without adding any diluents. The structures of the oligomers are verified by Fourier transform infrared spectroscopy, 1 H and 13 C nuclear magnetic resonance spectroscopy. The molecular weight and distribution have been measured by size exclusion chromatography. The thermal properties, including glass transition temperature, coefficient of thermal expansion, thermal stability and char yield, are characterized and discussed in this study.
研究领域:
高分子科学
·
材料工程
·
热固性树脂
·
可持续材料
✓ 已验证
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 136
·期 38
·47967
·
IF 2.188
Wei Wang,Guofei Chen,Xingzhong Fang
A series of thermoset oligoimides have been prepared by the thermal polycondensation of 1,4-bis(2,3-dicarboxyl-phenoxy)benzene dianhydride with three different aromatic diamines in the presence of 4-phenylethynylphthalic anhydride as an end capping reagent. The aromatic diamines included 4,4′-oxydianiline, 2,2′-bis(trifluoromethyl)benzidine (TFDB) and 2-phenyl-4,4′-diaminodiphenyl ether ( p -ODA). Effects of the chemical structures and molecular weights of the oligoimides on their aggregated structures, melt processability as well as the thermal and mechanical properties of the cured films were then systematically investigated. X-ray diffraction results indicated that ODA series oligoimides and TFDB series oligoimides showed crystallinity; however, the asymmetrical p -ODA enables the p -ODA series oligoimides to exhibit amorphous forms. So the p -ODA based oligoimides with molecular weight of 750 g mol −1 showed much lower melt viscosity at a low temperature and the melt viscosity could maintain below 1 Pa s −1 after isothermal aging for 2 h at any temperature in the range of 220–280 °C by rheological measurements. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 47967.
研究领域:
高分子科学
·
材料化学
·
高性能聚合物
·
热固性树脂
·
复合材料
·
聚酰亚胺
✓ 已验证
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2012
·Vol. 113
·期 2
·939-945
·
IF 1.604
Chen Yan,Yang Liting,Wu Jiahui,Ma Lijun,Finlow David E.,Lin Shaoquan,Song Keming
A series of new modified epoxy resin (EP) cured products were prepared from epoxidized soybean oil and commercial epoxy resin, with methyl nadic anhydride as curing agent and 1-methylimidazole as promoting agent. The thermal properties of the resins were characterized by DMA and TG; DSC was used to determine the curing process. Fourier transform infrared spectroscopy was utilized to investigate their molecular structures and scanning electron microscopy was used to observe the micro morphology of their impact fracture surfaces. Tensile and impact testing was employed to characterize the mechanical properties of the cured products. The combination of commercial EP with 20 wt% ESO resulted in a bioresin with the optimum set of properties: 130.5 °C T
g , 396.9 °C T
50 % , 74.89 MPa tensile strength, and 48.86 kJ m −2 impact resistance.
研究领域:
高分子材料
·
复合材料科学
·
生物基聚合物
·
材料化学
·
热固性树脂
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）