In situ Synthesis of Nano-sized Silica Enforced Anionic Polyester Sizing Agent and Its Effect on ILSS of Carbon Fiber Composites †

doi:10.7503/cjcu20190209

Abstract

Abstract:

Nano-sized silica enforced anionic polyester sizing agent(SEAPs) were synthesized by in situ synthetic technologies. SEAPs was analyzed and characterized by Fourier transform infrared spectroscopy(FTIR), laser particle size analyzer and cryo scanning electron microscope(SEM). The carbon fiber sized by SEAPs was studied with SEM, dynamic contact angle meter and energy dispersive spectroscopy(EDS). The surface morphology, surface energy, surface elements of carbon fibers and interlaminar shear strength(ILSS) of the sized carbon fibers and its reinforced unsaturated polyester composites were tested. The testing results showed that when the mass fraction of TEOS was 5%, the optimal ILSS of carbon fiber reinforced unsaturated polyester composite was obtained, which was 90% higher than that of carbon fibers composites after sizing with commercial epoxy resin sizing agent. In situ synthesized nano-SiO₂ formed core-shell micelle with anionic polyester and nano-sized SiO₂ is evenly adsorbed on the surface of carbon fibers after sizing, increasing the surface energy of carbon fibers and improving the wettability between carbon fibers and unsaturated polyester, which can effectively enhance the ILSS of carbon fibers composites.

Key words: Carbon fiber, Polyester sizing agent, Nano-sized silica, In situ synthesis, Iinterlaminar shear strength

CLC Number:

O631

TrendMD:

WANG Zhenyu, LI Jianhua, GUO Huijun, YANG Chuncai. In situ Synthesis of Nano-sized Silica Enforced Anionic Polyester Sizing Agent and Its Effect on ILSS of Carbon Fiber Composites ^†[J]. Chem. J. Chinese Universities, 2019, 40(9): 2005.

Figures/Tables 13

Fig.1 FTIR spectra of SEAPE0(a) and SEAPE5(b)

Fig.2 EDS element analysis of unsized CF(a) and CF5(b)

Sample	Mass fraction of element(%)
Sample	C	N	O	Si
Unsized CF	95.31				3.46	1.23	0
CF5	80.08				7.17	9.32	3.43

Fig.3 Cryo-SEM images of SEAPE0(A) and SEAPE5(B) and SEM images of unsized CF(C) and CF5(D)

Fig.4 Pictures of SEAPE after spun at 3000 r/min for 30 min (A) SEAPE0; (B) SEAPE5; (C)SEAPE10; (D)SEAPE20; (E)SEAPE30.

Fig.5 Effect of TEOS feeding amount on particle diameter of SEAPE

Fig.6 Cryo-SEM image of SEAPE20(A) and SEM image of CF20(B)

Fig.7 Surface energy of sized CF with different TEOS amounts

Fig.8 ILSS of different CF/UPR composites

Fig.9 SEM images of fractured composites of CCFe(A) and CCF5(B)

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