Interaction Between β-Tricalcium Phosphate and Poly(vinyl alcohol) and Its Effect on the Thermal and Mechanical Properties of Poly(vinyl alcohol)†

doi:10.7503/cjcu20140273

Abstract

Abstract:

Poly(vinyl alcohol)/β-tricalcium phosphate(PVA/β-TCP) composites were prepared using water as plasticizer, and the structure and properties of the composites were studied by Fourier transform infrared spectrometer(FTIR), X-ray photoelectron spectroscopy(XPS), scanning electron microscopy(SEM), differential scanning calorimetry(DSC), thermogravimetric analysis(TGA) and so on. The results showed that the coordination bond between β-TCP and PVA was formed, and it could increase the initial thermal decomposition temperature of PVA, while the melting temperature of composites decreased greatly with the addition of plasticizer, thus about 138 ℃ thermal processing window was obtained. Also, the composites had excellent mechanical properties with the well dispersion of β-TCP particles in PVA matrix and good phase interface between β-TCP and PVA.

Key words: Poly(vinyl alcohol), β-Tricalcium phosphate, Coordination structure, Thermal property, Mechanical property

CLC Number:

O631

TrendMD:

WANG Huan, CHEN Ning, WANG Qi. Interaction Between β-Tricalcium Phosphate and Poly(vinyl alcohol) and Its Effect on the Thermal and Mechanical Properties of Poly(vinyl alcohol)^†[J]. Chem. J. Chinese Universities, 2014, 35(8): 1810.

Figures/Tables 10

Fig.1 FTIR of β-TCP and PVA/β-TCP composites a. PVA; b. PVA/β-TCP-10%; c. PVA/β-TCP-20%; d. PVA/β-TCP-30%; e. β-TCP.

Table 1 FTIR characterization peaks of PVA and PVA/β-TCP composites

Sample	ν_O—H/cm^-1	ν_C—H/cm^-1	δ_C—H/cm^-1	δ_O—H/cm^-1	ν_C—O/cm^-1
PVA	3316	2921, 2858	1425	1656	1089
PVA/β-TCP-10%	3308	2924, 2855	1426	1657	1085
PVA/β-TCP-20%	3304	2925, 2856	1425	1651	1080
PVA/β-TCP-30%	3301	2922, 2858	1424	1662	1073

Fig.2 Interaction between Ca2+ and PVA

Fig.3 XPS O1s spectra of PVA(A), β-TCP(B) and PVA/β-TCP composites(C)

Fig.4 XPS Ca2p spectra of β-TCP(A) and PVA/β-TCP composites(B)

Table 2 XPS data of β-TCP, PVA and PVA/β-TCP composites

Sample	O₁_s		Ca₂_p
β-TCP	531.0	532.4	347.2	350.8
PVA		532.5
PVA/β-TCP-30%	531.6	532.6	347.6	351.3

Fig.5 SEM images of β-TCP(A), PVA(B), PVA/β-TCP-20%(C) and PVA/β-TCP-30%(D) composites

Fig.6 DSC curves of PVA/β-TCP composites using the high-pressure stainless steel pan a. Modified PVA; b. modified PVA/β-TCP-10%; c. modified PVA/β-TCP-20%; d. modified PVA β-TCP-30%.

Fig.7 TGA curves of PVA(a), PVA/β-TCP-10%(b), PVA/β-TCP-20%(c) and PVA/β-TCP-30%(d) (A) Original thermograms; (B) enlarged thermograms.

Fig.8 Effects of β-TCP content on the tensile strength(a) and elongation at break(b) of modified PVA/β-TCP composites

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