Curing characteristics of shape memory polymers in 3D projection and laser stereolithography

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Section: 可直接用于热塑性Smp及其复合材料的4d打印unclassified

4D printing of shape memory polymers: Research status and application prospects

et al. 2017

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“…SMPs, with activation triggered by heat, have been widely studied. The activation trigger can be direct heating [6][7][8][9][10], electric [11][12][13], magnetic fields [14,15] or light [16,17]. The advantage of magnetic and light activations is that they can be performed remotely, without the need of direct contact or wiring.…”

Section: Introductionmentioning

confidence: 99%

“…For magnetic triggering, there is usually a need for a strong magnetic field induced by a robust electromagnet or magnet, while for light activation, a compact simple light source is sufficiently efficient. A variety of 3D printing methods have been demonstrated over the years for SMP materials, including extrusion-based methods, such as fused modeling deposition (FDM) [8,9,15,17], direct ink writing (DIW) [7,11,12] and stereolithography (SLA) approaches, including laser sintering [6], Polyjet technology [13,18] and digital light processing (DLP, also known as vat polymerization printing) [10,[19][20][21]. An advantage of SLA is the possibility of printing with high resolution, which makes it a very favorable method for building various functional 3D objects.…”

Section: Introductionmentioning

confidence: 99%

Multi-Material 3D Printed Shape Memory Polymer with Tunable Melting and Glass Transition Temperature Activated by Heat or Light

et al. 2020

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Shape memory polymers are attractive smart materials that have many practical applications and academic interest. Three-dimensional (3D) printable shape memory polymers are of great importance for the fabrication of soft robotic devices due to their ability to build complex 3D structures with desired shapes. We present a 3D printable shape memory polymer, with controlled melting and transition temperature, composed of methacrylated polycaprolactone monomers and N-Vinylcaprolactam reactive diluent. Tuning the ratio between the monomers and the diluents resulted in changes in melting and transition temperatures by 20, and 6 °C, respectively. The effect of the diluent addition on the shape memory behavior and mechanical properties was studied, showing above 85% recovery ratio, and above 90% fixity, when the concentration of the diluent was up to 40 wt %. Finally, we demonstrated multi-material printing of a 3D structure that can be activated locally, at two different temperatures, by two different stimuli; direct heating and light irradiation. The remote light activation was enabled by utilizing a coating of Carbon Nano Tubes (CNTs) as an absorbing material, onto sections of the printed objects.

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“…4D printing is the printing of a dynamic 3D structure that is capable of changing its shape over time [ 2 , 3 ]. In order to do that, smart materials are 4D printed by using fused deposition modelling of single or double layer print [ 4 , 5 ], 3D projection and laser stereolithography (SLA) [ 6 ], digital light processing printing (DLP) [ 7 ], PolyJet technology [ 8 ] or Selective Laser Melting (SLM) [ 9 ]. For example recently, there has been research performed on the design of origami by using SMPs (Shape Memory Polymers), light activated polymers [ 10 ], and shape memory alloys [ 11 , 12 ].…”

Section: Introductionmentioning

confidence: 99%

Design and 4D Printing of Cross-Folded Origami Structures: A Preliminary Investigation

Teoh

Feng

et al. 2018

Materials

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In 4D printing research, different types of complex structure folding and unfolding have been investigated. However, research on cross-folding of origami structures (defined as a folding structure with at least two overlapping folds) has not been reported. This research focuses on the investigation of cross-folding structures using multi-material components along different axes and different horizontal hinge thickness with single homogeneous material. Tensile tests were conducted to determine the impact of multi-material components and horizontal hinge thickness. In the case of multi-material structures, the hybrid material composition has a significant impact on the overall maximum strain and Young’s modulus properties. In the case of single material structures, the shape recovery speed is inversely proportional to the horizontal hinge thickness, while the flexural or bending strength is proportional to the horizontal hinge thickness. A hinge with a thickness of 0.5 mm could be folded three times prior to fracture whilst a hinge with a thickness of 0.3 mm could be folded only once prior to fracture. A hinge with a thickness of 0.1 mm could not even be folded without cracking. The introduction of a physical hole in the center of the folding/unfolding line provided stress relief and prevented fracture. A complex flower petal shape was used to successfully demonstrate the implementation of overlapping and non-overlapping folding lines using both single material segments and multi-material segments. Design guidelines for establishing cross-folding structures using multi-material components along different axes and different horizontal hinge thicknesses with single or homogeneous material were established. These guidelines can be used to design and implement complex origami structures with overlapping and non-overlapping folding lines. Combined overlapping folding structures could be implemented and allocating specific hole locations in the overall designs could be further explored. In addition, creating a more precise prediction by investigating sets of in between hinge thicknesses and comparing the folding times before fracture, will be the subject of future work.

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Curing characteristics of shape memory polymers in 3D projection and laser stereolithography

Cited by 71 publications

References 16 publications

4D printing of shape memory polymers: Research status and application prospects

4D printing of shape memory polymers: Research status and application prospects

Multi-Material 3D Printed Shape Memory Polymer with Tunable Melting and Glass Transition Temperature Activated by Heat or Light

Design and 4D Printing of Cross-Folded Origami Structures: A Preliminary Investigation

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