研究目的
To design and prepare molecules and oligomers with the capability to further improve the toughness of an established photopolymerizable vinyl ester-based thiol–ene network already investigated for the fabrication of bone graft substitutes by DLP-SLA.
研究成果
All additives improved impact toughness, with DVC showing the best overall performance in terms of maintaining tensile strength and increasing glass transition temperature. The study suggests that DVC in concentrations of 10–15 wt % is optimal for improving toughness without compromising other critical properties for bone tissue engineering applications.
研究不足
The study was limited by the need to balance toughness improvements with other mechanical properties such as tensile strength and glass transition temperature. High concentrations of additives, especially UDT, led to significant decreases in these properties.
1：Experimental Design and Method Selection:
The study focused on improving the toughness of vinyl ester-based thiol–ene photoresins by incorporating additives based on poly(ε-caprolactone) (PCL). The additives included unmodified PCL, copolymerizable divinyl carbonate (DVC) modified PCL, and a urethane dithiol (UDT). The formulations were tested for reactivity and mechanical properties.
2：Sample Selection and Data Sources:
The reference formulation consisted of divinyl adipate (DVA) and trimethylolpropane tris(3-mercaptopropionate) (TMPMP). Additives were blended into this reference at various concentrations.
3：List of Experimental Equipment and Materials:
Materials included DVA, TMPMP, PCL, DVC, UDT, and photoinitiator Ivocerin. Equipment included a Bruker Avance 400 MHz Fourier transform-NMR spectrometer, Biorad FTS 135 spectrophotometer, and Anton Paar MCR302 WESP rheometer.
4：Experimental Procedures and Operational Workflow:
Formulations were prepared, characterized by RT-NIR photorheology, and tested for mechanical properties including impact resistance and tensile strength.
5：Data Analysis Methods:
Data were analyzed using NMR, ATR-FTIR, GPC, and mechanical testing methods.
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