摘要
以腰果酚与苯胺为原料合成腰果酚-苯胺苯并噁嗪(C-A),然后将其与二胺型苯并噁嗪-4,4-二氨基二苯甲烷型苯并噁嗪(PH-DDM)进一步共聚,利用腰果酚间位长脂肪链的自增塑作用来改善共聚树脂韧性,从而改进传统聚苯并噁嗪脆性大的缺点。通过示差扫描量热法、动态热力学分析、热重分析以及拉伸测试等表征方法研究共聚树脂的动态力学性能、热稳定性和机械性能。结果表明:当PH-DDM/C-A的摩尔比为2.5∶1时,聚苯并噁嗪共聚树脂的玻璃化转变温度能保持在175℃以上,800℃下残炭率在39%以上,表明聚苯并噁嗪共聚树脂的热稳定性较为稳定;聚苯并噁嗪共聚树脂拉伸断裂应力达到57 MPa,断裂伸长率增加到3.38%,相比于纯PH-DDM提高了20%。本文验证了腰果酚基苯并噁嗪对传统苯并噁嗪树脂增韧的有效性,对开拓苯并噁嗪的应用范围具有参考意义。
In this work, we used cardanol and aniline as raw materials to synthesized cardanol-aniline benzoxazine(C-A), and then copolymerized with diamine-type benzoxazine-4,4-diaminodiphenylmethane-type benzoxazine(PH-DDM), which take advantage of C-A in term of its self-plasticizing effect that driven by the long aliphatic chain at meta-position to improve the toughness of copolymer resin, thus overcoming the shortcomings of the brittleness of traditional polybenzoxazines. The copolymerized resins were characterized using differential scanning calorimetry(DSC),dynamic thermomechanical analysis(DMA), thermogravimetric analysis(TGA), and tensile text to investigate their dynamic mechanical properties, thermal stabilitiesand mechanical properties. Experimental results revealed that the resin prepared at PH-DDM/C-A molar ratio of 2.5∶1 gives best toughening effect, polybenzoxazine′s glass transition temperature(T;) is higher than 175 ℃, the 800 ℃ char yield above 39%, thermal stability remain stable;The tensile stress at break reached to 57 MPa, and the corresponding elongation at break below 3.38%, which is 20% higher than that of the bulk cured PH-DDM resin. Our work demonstrated the toughening effectiveness of the cardanol-based benzoxazines with the traditional benzoxazines, showing a positive significance for expanding applications of benzoxazine.
作者
孙浩然
金子毅
胡欣悦
温小东
付飞亚
刘向东
SUN Haoran;JIN Ziyi;HU Xinyue;WEN Xiaodong;FU Feiya;LIU Xiangdong(School of Materials Science&Engineering,Zhejiang Sci Tech University,Hangzhou 310018,China)
出处
《浙江理工大学学报（自然科学版）》
2022年第3期348-356,共9页
Journal of Zhejiang Sci-Tech University(Natural Sciences)
基金
国家自然科学基金项目(51873195)。
关键词
苯并噁嗪
腰果酚
共聚
增韧
自增塑作用
benzoxazine
cardanol
copolymerization
toughen
self-plasticization
