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- W2000869391 abstract "Calcium silicate/poly(ethylene terephthalate-co-caprolactone) (CS/PET-co-PCL) composites were prepared via ring opening polymerisation (ROP) technique. The CS/PET-co-PCL composites were prepared by mixing 60 wt-% of CS, 40 wt-% of cyclics and dibutyl tinoxide catalyst (3 mol.-% with respect to cyclics). The cyclics consisted of the mixture of cyclic oligo(ethylene terephthalate) (C-OET) and ϵ-caprolactone (CPL) with varying molar ratio of C-OET/CPL, i.e. 7∶3, 8∶2 and 9∶1. The precomposites were then ring opening polymerised at 200°C for 24 h. The ROP-PET-co-PCL in the composites was present as a continuous phase impregnated with the CS particles. The 1H-NMR spectra of ROP-PET-co-PCL extracted from the CS/PET-co-PCL composites showed heterolinkage signals between PET and PCL at δ 4·4 and δ 4·6 ppm, indicating successful copolymerisation. When the PCL content increased, the ROP-PET-co-PCL changed in the copolymer structure from block to random structure. The presence of CS powders in the CS/PET-co-PCL composites resulted in high stiffness of the composites and inhibited heat dissipation during the dynamic mechanical analysis performed between −50 and 200°C. The compressive strengths of all the composites were in the range of 16–21 MPa. The higher the PET content, the stronger the CS/PET-co-PCL composites obtained. Composites containing 9∶1 of C-OET/CPL polymerised at 200°C possessed the highest compressive strengths of 21·3 MPa, falling in the range of cartilage bone, i.e. 14–59 MPa. Bioactivities of the CS/PET-co-PCL composites were studied by soaking in simulated body fluid for 7 days. All CS/PET-co-PCL composites could induce the formation of hydroxyapatite nanocrystals on the composite surfaces, indicating the bioactivity of the CS/PET-co-PCL composites." @default.
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- W2000869391 date "2013-12-01" @default.
- W2000869391 modified "2023-10-14" @default.
- W2000869391 title "Mechanical properties and bioactivity of calcium silicate/poly(ethylene terephthalate-<i>co</i>-caprolactone) composites" @default.
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- W2000869391 doi "https://doi.org/10.1179/1432891713z.000000000301" @default.
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