3D Printing Latex: A Route to Complex Geometries of High Molecular Weight Polymers
3D Printing Latex: A Route to Complex Geometries of High Molecular Weight Polymers
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3D 打印乳胶：高分子量聚合物复杂几何形状的途径
DOI：
10.1021/acsami.9b19986
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发表时间：
2020
影响因子：
9.5
通讯作者：
Long, Timothy E.
中科院分区：
文献类型：
--
作者：
Scott, Philip J.;Meenakshisundaram, Viswanath;Hegde, Maruti;Kasprzak, Christopher R.;Winkler, Christopher R.;Feller, Keyton D.;Williams, Christopher B.;Long, Timothy E.
还原光聚合（VP）增材制造以优异的分辨率制造复杂的几何形状;然而，高分子量聚合物由于伴随的高溶液和熔体粘度而不适合VP。因此，在适印性和机械性能之间出现了一个具有挑战性的悖论。本报告描述了并发的光聚合物和VP系统设计，以前所未有地使用聚合物胶体（胶乳），有效地解耦粘度对分子量的依赖性，从而解决这一矛盾。连续相支架的光交联，其围绕胶乳颗粒，结合原位计算机视觉印刷参数优化，其补偿光散射，使得高分子量聚合物胶乳的高分辨率VP成为颗粒嵌入的绿色体。热后处理促进了整个支架中分散颗粒的聚结，形成半互穿聚合物网络，而不会损失部分分辨率。印刷苯乙烯-丁二烯橡胶胶乳，一种以前无法获得的弹性体组合物的VP，举例说明了这种方法，并产生了印刷的弹性体与精确的几何形状和拉伸伸长率超过500%。
Vat photopolymerization (VP) additive manufacturing fabricates intricate geometries with excellent resolution; however, high molecular weight polymers are not amenable to VP due to concomitant high solution and melt viscosities. Thus, a challenging paradox arises between printability and mechanical performance. This report describes concurrent photopolymer and VP system design to navigate this paradox with the unprecedented use of polymeric colloids (latexes) that effectively decouple the dependency of viscosity on molecular weight. Photocrosslinking of a continuous-phase scaffold, which surrounds the latex particles, combined with in situ computer-vision print parameter optimization, which compensates for light scattering, enables high-resolution VP of high molecular weight polymer latexes as particle-embedded green bodies. Thermal post-processing promotes coalescence of the dispersed particles throughout the scaffold, forming a semi-interpenetrating polymer network without loss in part resolution. Printing a styrene-butadiene rubber latex, a previously inaccessible elastomer composition for VP, exemplified this approach and yielded printed elastomers with precise geometry and tensile extensibilities exceeding 500%.