Copolymerization of phthalonitrile-based resin containing benzoxazine and cyanate ester: Curing behaviors, fiber-reinforced composite laminates and improved properties

eXPRESS Polymer Letters

L. Chen¹ 

关键词: polymer composites;    benzoxazine;    phthalonitrile;    composite laminates;    mechanical properties;   

DOI  :  10.3144/expresspolymlett.2019.38

学科分类：生物科学（综合）

来源: eXPRESS Polymer Letters

【 摘 要 】

Curing behaviors and copolymerization mechanisms between phthalonitrile-based resin containing benzoxazine(A-ph) and cyanate ester (CE) were characterized and discussed. Results indicated that copolymerization between A-ph andCE were comprised of ring-opening polymerization of oxazine rings and ring-forming polymerization of cyanate and nitrilegroups. From them, ring-opening of oxazine occurred preferentially, followed by ring-forming of cyanate and nitrile groups,which were promoted by active hydrogen and amine structures generated from ring-opening of oxazine. Moreover, with increasingthe content of CE (≥40 wt%), self-polymerization of cyanate would dominate the components of the resulting compositesand reduces the thermal stability of fiber-reinforced composite laminates. Additionally, mechanical properties ofcomposite laminates were also affected by the content of CE. Composite laminates with 10 wt% CE showed the highestflexural strength (622 MPa). The improved mechanical properties were also verified with investigation of dynamic thermomechanicalanalysis and morphology of fracture surfaces. These findings are helpful to improve the thermosetting resins interms of their chemical structure, material properties, and processability.

【 授权许可】

CC BY