高级检索

    王汉武, 贾瑞明, 冉起超. 生物基苯并噁嗪作为环氧树脂潜伏性固化剂的研究[J]. 功能高分子学报,2022,35(3):236-243. doi: 10.14133/j.cnki.1008-9357.20210730001
    引用本文: 王汉武, 贾瑞明, 冉起超. 生物基苯并噁嗪作为环氧树脂潜伏性固化剂的研究[J]. 功能高分子学报,2022,35(3):236-243. doi: 10.14133/j.cnki.1008-9357.20210730001
    WANG Hanwu, JIA Ruiming, RAN Qichao. Latent Curing Agent of Epoxy Resin Based on Bio-Benzoxazine[J]. Journal of Functional Polymers, 2022, 35(3): 236-243. doi: 10.14133/j.cnki.1008-9357.20210730001
    Citation: WANG Hanwu, JIA Ruiming, RAN Qichao. Latent Curing Agent of Epoxy Resin Based on Bio-Benzoxazine[J]. Journal of Functional Polymers, 2022, 35(3): 236-243. doi: 10.14133/j.cnki.1008-9357.20210730001

    生物基苯并噁嗪作为环氧树脂潜伏性固化剂的研究

    Latent Curing Agent of Epoxy Resin Based on Bio-Benzoxazine

    • 摘要: 以糠胺、香草醛、多聚甲醛为原料合成了一种生物基苯并噁嗪(V-fa)。选择双环戊二烯-苯酚型环氧树脂(DCPD-ER)为研究对象,将V-fa作为固化剂按不同比例加入到DCPD-ER中,同时以二氨基二苯甲烷(DDM)为固化剂进行对比研究。通过傅里叶红外光谱(FT-IR)、核磁共振氢谱(1H-NMR)对V-fa的化学结构进行表征,确认了其结构。采用差示扫描量热(DSC)、FT-IR系统研究了树脂体系的固化反应。此外,使用动态热机械分析(DMA)、热失重分析(TGA)考察了固化物的热性能。研究表明,与DCPD-ER/DDM相比,DCPD-ER/V-fa的起始固化反应温度和固化反应活化能较高。DCPD-ER/V-fa固化物的玻璃化转变温度(Tg)、初始分解温度和800 ℃氮气下的残炭率(Yc)均高于DCPD-ER/DDM的相应值,其TgYc分别高达192 ℃与44%。同时,V-fa的加入能够改善树脂体系的阻燃性能。

       

      Abstract: A bio-based benzoxazine (V-fa) was synthesized from furfuramine, vanillin and paraformaldehyde. Its chemical structure was characterized by Fourier-transformed Infrared spectra (FT-IR) and 1H-Nuclear Magnetic Resonance (1H-NMR) spectra. Results show that this new benzoxazine monomer is synthesized successfully. Dicyclopentadiene-phenol epoxy resin (DCPD-ER) was selected as a research object. V-fa was added into DCPD-ER in different proportions as a latent curing agent. At the same time, a usual curing agent, diaminodiphenylmethane (DDM), was also used as a comparative study. The curing reaction of the resin system was studied by Differential Scanning Calorimetry (DSC) and FT-IR spectra. Compared with DCPD-ER/DDM, DCPD-ER/V-fa has a higher initial curing reaction temperature and curing reaction activation energy. DCPD-ER/V-fa can cure at a high temperature, which is attributed to the reaction between phenolic hydroxyl groups produced by ring-opening reaction of the benzoxazine and epoxy groups. In addition, the thermal properties of the cured products were investigated by Dynamic Mechanical Analysis (DMA) and Thermogravimetric Analysis (TGA). The addition of V-fa can improve the heat resistance and thermal stability of the resin system. The glass transition temperature (Tg), initial decomposition temperature and char yield under nitrogen at 800 oC (Yc) of DCPD-ER/V-fa are higher than those of DCPD-ER/DDM, and the Tg and Yc can reach as high as 192 oC and 44%, respectively. Moreover, the flame retardancy of DCPD-ER/V-fa was evaluated on the basis of the results from TGA measurements. The limiting oxygen index (LOI) of DCPD-ER/V-fa can reach as high as 35.1, suggesting that the addition of V-fa improves the flame retardancy of the epoxy resin.

       

    /

    返回文章
    返回