Mechanical and thermal enhancements of benzoxazine‐based GF composite laminated by in situ reaction with carboxyl functionalized CNTs. Issue 5 (30th January 2013)

• Record Type: Journal Article
• Authors: Xu, Mingzhen; Hu, Jinquan; Zou, Xingqiang; Liu, Mengdie; Dong, Shihua; zou, Yanke; Liu, Xiaobo
• Is Part Of: Journal of applied polymer science. Volume 129:Issue 5(2013:Sep. 05)
• Page Start: 2629
• Page End: 2637
• Publication Date: 2013-01-30
• Subjects: Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.38988
• Languages: English
• ISSNs: 0021-8995

Abstract

<abstract abstract-type="main" xml:lang="en"> <title>Abstract</title> <p>An easy and efficient approach by using carboxyl functionalized CNTs (CNT‐COOH) as nano reinforcement was reported to develop advanced thermosetting composite laminates. Benzoxazine containing cyano groups (BA‐ph) grafted with CNTs (CNT‐<italic>g</italic>‐BA‐ph), obtained from the <italic>in situ</italic> reaction of BA‐ph and CNT‐COOH, was used as polymer matrix and processed into glass fiber (GF)‐reinforced laminates through hot‐pressed technology. FTIR study confirmed that CNT‐COOH was bonded to BA‐ph matrices. The flexural strength and modulus increased from 450 MPa and 26.4 GPa in BA‐ph laminate to 650 MPa and 28.4 GPa in CNT‐<italic>g</italic>‐BA‐ph/GF composite, leading to 44 and 7.5% increase, respectively. The SEM image observation indicated that the CNT‐COOH was distributed homogeneously in the matrix, and thus significantly eliminated the resin‐rich regions and free volumes. Besides, the obtained composite laminates showed excellent thermal and thermal‐oxidative stabilities with the onset degradation temperature up to 624°C in N<sub>2</sub> and 522°C in air. This study demonstrated that CNT‐COOH grafted on thermosetting matrices through <italic>in situ</italic> reaction can lead to obvious mechanical and thermal increments, which provided a new and effective way to design and improve the properties of composite laminates. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013</p> </abstract>