Abstract
AbstractUV‐curing 3D printing technology is one of the additive manufacturing techniques with the best printing accuracy and efficiency, but its advance is being challenged by the high curing shrinkage, poor mechanical strength and low toughness of photosensitive resin. Herein, rod‐shaped calcium carbonate modified by γ‐mercaptopropyl triethoxysilane (RCa‐Si) is used to improve the 3D printing resin. After compositing with RCa‐Si, the photopolymerization conversion of resin is slightly decreased, but it is still possible to 3D print accurate samples with a warpage of 1.0%. By adjusting the grafting ratio of thiols and the content of resultant RCa‐Si, the maximum elastic modulus of 3D printed samples is increased from 990 to 1420 MPa, tensile strength is enhanced from 35 to 63 MPa, and impact strength is also increased from 2.1 to 4.6 kJ/m2, owing to its anchoring effect between printing layers. Moreover, the thermal decomposition temperature of 3D printed sample containing 1.0 wt% of RCa1‐Si1 is increased to 325°C, and its Vicat softening point temperature is also increased to 193°C. Therefore, the comprehensive properties of 3D printing resin can be greatly improved by modified rod‐shaped calcium carbonate with thiols, guaranteeing the future large‐scale applications.
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