当前位置: X-MOL 学术ACS Appl. Polym. Mater. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
3D Printed Microdroplet Curing: Unravelling the Physics of On-Spot Photopolymerization
ACS Applied Polymer Materials ( IF 4.4 ) Pub Date : 2020-01-28 , DOI: 10.1021/acsapm.9b01181
Vishal Sankar Sivasankar 1 , Harnoor Singh Sachar 1 , Shayandev Sinha 2 , Daniel R. Hines 3 , Siddhartha Das 1
Affiliation  

Droplet-based direct-write printing (one form of 3D printing) methods, like inkjet printing, aerosol jet printing (AJP), etc., have changed our ideas about bottom-up additive manufacturing. AJP is capable of 3D printing by depositing microdroplets that lead to certain benefits in 3D printing of microscale structures. Here, we study the in situ photopolymerization-based curing of a microdroplet. The droplet is simultaneously spreading and curing, which leads to the rise of two time scales, the spreading time scale (τs) and the photopolymerization time scale (τp). When τs ≪ τp, the spreading occurs very fast and is independent of polymerization. If the time scales are of the same order (τs ∼ τp), the spreading is significantly affected by the polymerization. For this case, a progressive increase in the viscosity of the drop during the spreading ensures a much slower spreading and also a much weaker extent of spreading (i.e., the spreading ceases at a much smaller spreading radius of the drop). This complex thermofluidics is eventually manifested as distinct differences in the time-dependent velocity, temperature, and curing (or equivalently, monomer concentration) profiles within the drop between the two cases.

中文翻译:

3D打印微滴固化:揭示现场光聚合的物理原理

基于液滴的直接书写打印(3D打印的一种形式)方法,例如喷墨打印,气溶胶喷射打印(AJP)等,已经改变了我们关于自下而上的增材制造的观念。AJP能够通过沉积微滴进行3D打印,从而在微尺度结构的3D打印中带来某些好处。在这里,我们研究了微滴的基于原位光聚合的固化。液滴同时扩展和固化,这导致两个时间尺度的上升,扩展时间标度(τ小号)和光聚合时间尺度(τ p)。当τ小号«τ p,扩展发生非常快速的,并且独立聚合。如果时间尺度是相同的顺序(τ小号〜τ p),则显著受聚合扩频。对于这种情况,在撒布过程中液滴粘度的逐渐增加确保了撒布速度慢得多,并且撒布程度也很弱(即,撒布在小得多的撒布半径处停止了)。最终,这种复杂的热流体表现为两种情况之间的液滴内随时间变化的速度,温度和固化(或等效地,单体浓度)曲线的明显差异。
更新日期:2020-01-29
down
wechat
bug