High speed 4D printing of shape memory polymers with nanosilica

被引:105
作者
Choong, Yu Ying Clarrisa [1 ]
Maleksaeedi, Saeed [2 ]
Eng, Hengky [2 ]
Yu, Suzhu [2 ]
Wei, Jun [2 ]
Su, Pei-Chen [3 ]
机构
[1] Nanyang Technol Univ, Sch Mech & Aerosp Engn, HP NTU Digital Mfg Corp Lab, 50 Nanyang Ave, Singapore 639798, Singapore
[2] Singapore Inst Mfg Technol, 73 Nanyang Dr, Singapore 637662, Singapore
[3] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore Ctr 3D Printing, 50 Nanyang Ave, Singapore 639798, Singapore
关键词
Additive manufacturing; 3D printing; 4D printing; Shape memory polymer; Nanocomposites; NANOCOMPOSITES; NUCLEATION; PROJECTION;
D O I
10.1016/j.apmt.2019.100515
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
This work presents a novel development to accelerate the printing speed of photopolymerization-based process by improving resin curability with nanosilica fillers. The nanosilica particles are revealed as "superior catalysts" that altered the light scattering characteristics of the resin. By taking advantage of the large number of compact nucleation sites on their surfaces, the nanosilica facilitated remarkably fast curing rates by greatly reducing the curing time for each layer of printing from 4 s to 0.7 s. The addition of nanosilica into shape memory polymers (SMPs) resins has also invoked new development of SMP composites as reinforced 4D printing materials. The particle -polymer interaction was carefully tuned to control the plasticizing effect of nanosilica domains in the polymer chains. The printed composites exhibited improvement in mechanical properties by an order of magnitude and greater elongation of 85.2 % as compared to their neat SMPs. The multifunctional crosslink nature of the nanosilica also maintained the shape recovery ratio within a high range of 87-90%. This work achieves fresh mechanistic insights in the critical role and influences of nanosilica in developing high speed 3D printing technology and opens up newly-developed high-performance material. (C) 2019 Elsevier Ltd. All rights reserved.
引用
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页数:10
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