Polymer-inorganic hybrid colloids for ultraviolet-assisted direct ink write of polymer nanocomposites
Polymer-inorganic hybrid colloids for ultraviolet-assisted direct ink write of polymer nanocomposites
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DOI：
10.1016/j.addma.2020.101393
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发表时间：
2020-10
影响因子：
11
通讯作者：
Philip J. Scott;D. Rau;J. Wen;M. Nguyen;Christopher R. Kasprzak;C. Williams;T. Long
中科院分区：
文献类型：
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作者：
Philip J. Scott;D. Rau;J. Wen;M. Nguyen;Christopher R. Kasprzak;C. Williams;T. Long
无机-聚合物混合胶体提供了一种模块化和可调的路线，以从低粘度前体制造聚合物纳米复合材料;然而，它们在增材制造中的使用仍然有限。该手稿描述了能够分层制造弹性体纳米复合材料的可光固化的“混合胶体”，即，连续相光交联化学与水分散性二氧化硅纳米颗粒和丁苯橡胶（SBR）胶乳颗粒的混合胶体的组合。通过改变聚合物和无机颗粒的相对浓度，可以精确调节最终纳米复合材料中的填料含量，并引入具有理想流变行为的双峰粒度分布，用于基于挤出的增材制造。具体地，光固化混合胶体糊剂的紫外线辅助直接油墨写入（UV-DIW）处理产生独立的绿色体，其含有SBR和二氧化硅纳米颗粒的组合。随后干燥的绿色机构允许SBR颗粒聚结和渗透通过支架和周围的二氧化硅纳米粒子，这产生了半互穿网络（sIPN）的纳米复合材料。混合胶体中二氧化硅浓度的容易调节使得能够调节最终sIPN纳米复合材料的胶体油墨流变学和机械性质两者，以实现具有超过300%的极限拉伸应变和高于IOMPa的极限拉伸强度的二氧化硅-SBR纳米复合材料的增材制造。
Inorganic-polymer hybrid colloids present a modular and tunable route to fabricate polymer nanocomposites from low viscosity precursors; however, their use in additive manufacturing remains limited. This manuscript describes photocurable “hybrid colloids” to enable layered fabrication of elastomeric nanocomposites, i.e., combination of continuous-phase photocrosslinking chemistry with hybrid colloids of water-dispersible silica nanoparticles and styrene-butadiene rubber (SBR) latex particles. Varying the relative concentrations of polymeric and inorganic particles afforded precise tuning of filler loading in the final nanocomposite and introduced a bimodal particle size distribution with desirable rheological behavior for extrusion-based additive manufacturing. Specifically, ultraviolet-assisted direct ink write (UV-DIW) processing of the photocurable hybrid colloid pastes generated free-standing green bodies, which contained a combination of SBR and silica nanoparticles. Subsequent drying of the green bodies allowed SBR particle coalescence and penetration through the scaffold and surrounding the silica nanoparticles, which yielded a semi-interpenetrating network (sIPN) nanocomposite. Facile tuning of silica concentrations in the hybrid colloid enabled tuning of both the colloidal ink rheology and mechanical properties of the final sIPN nanocomposites to achieve additive manufacturing of silica-SBR nanocomposites with ultimate tensile strains exceeding 300 % and ultimate tensile strengths above 10 MPa.