Polymer carbon fiber interface

Donnet, J.B., Dong, S, Guilman, G., Brcndle, M. (1988). Carbon fibers electrochemical and plasma surface treatment. In Proc. ICCl-U, Interfaces in Polymer. Ceramic and Metal Matrix Composites (H. Ishida cd.), Elsevier Sci. Pub., New York, pp. 35-42. 

Wright, W.W. (1990). The carbon fiber-epoxy resin interfaces-a review, part I. In Composite Polymer Vol, 3. (P. Dickin, ed.), pp. 231-401. 

In using Eq. (6.10) to predict / , of a given composite system it is important that the said failure mechanisms all exist. If any one mechanism is apparently absent the corresponding toughness term must be excluded from the / t equation. It is also worth emphasizing that / , varies linearly with reciprocal of the frictional shear strength of the interface, i.e. l/tf, with the lower limit of (1 — Ff)/fm when if approaches infinity. This relationship has been shown to apply to many carbon fiber polymer matrix composites (CFRPs) (Harris et al., 1971 Beaumont and Phillips,... 

Carbon fiber reinforced composites are at the forefront of current developments in polymer composites, and there is additional evidence for the important role being played by IGC in characterizing the interface in such systems. The Gutmann theory is used by Bolvari and Ward, who report add/base interactions for surface-treated carbon fibers and a series of thermoplastic polymer hosts, including polysulfone, polycarbonate, and... 

Thermoplastic polymers that have the necessary requirements to qualify as a matrix in composite structural components (for example, solvent resistance, high modulus, high glass transition, and good fracture energy) tend to exhibit poor adhesion to carbon fibers. The weakness of this fiber-matrix interface results in a composite that may be unacceptable in its final performance. The question of why this bond is weak and concern for quantifying the relationship with respect to adhesion led to the current investigation. 

Polymer composites. The composite research at the Institute is led by Prof. Wu Renjie, Deputy director of the Institute. Chen, et al. (14), studied the effect of oxidation of carbon fiber on the wettability by the binder resin. With the aid of ESCA, they showed that the Q/C ratio on the fiber surface increased with the oxidation time. The interlaminar shear strength also increased correspondingly. Cai Weizhen and her colleagues showed me their exceptional setup for a carbon-fiber composite study. They built their own torsion pendulum for the study of dynamic mechanical properties of the composite and a contact angle goniometer for the study of the composite interface. It was apparent that surface treatment of carbon fiber was their major concern. 

Within the past few years, many investigators have observed an increase in the degree of crystallinity or crystallite size of semicrystalline polymer-CNT composites due to the addition of CNTs. Differential scanning calorimetry (DSC) melting endotherms have been frequently employed to demonstrate this effect (Table 35.3). Recently, Coleman et al. [69] investigated this induced crystallization effect, and related it to the mechanical properties of the composite. The results highlight a fundamental difference between CNT-polymer composites and carbon fiber—polymer composites with CNT composites the interface dominates all other effects due to the vast surface area/volume ratio that CNTs have relative to carbon fibers (Fig. 35.2). 

Poleunis C, Fallais I, Carlier V, Sclavons M, Bertrand P, Legras R, ToF-SIMS imaging of carbon fiber polymer interface in composite materials, Proc l(f International Gonf on Secondary Ion Mass Spectrometry SIMS X, Wiley, Munster, Oct 1-6, 1995. 

Denison P, Jones FR, Brown A, Humphrey P, Paul AJ, Scanning SIMS spectography of cfrp, Ishida H ed., Interfaces in Polymer, Geramic and Metal Matrix Gomposites, 239-248, 1988. Hearn MJ, Briggs D, ToF-SIMS studies of carbon fiber surfaces and carbon fiber composite fracture surfaces. Surface Interface Analysis, 17(7), 421 et seq, 1991. 

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