Room-Temperature Solid-State UV Cross-Linkable Vitrimer-like Polymers for Additive Manufacturing.
Room-Temperature Solid-State UV Cross-Linkable Vitrimer-like Polymers for Additive Manufacturing.
复制标题
作者：
在本文中，报道了一种可紫外交联的类玻璃体聚合物——脲基嘧啶酮官能化遥爪聚丁二烯。它的合成分两步进行。首先，2(6-异氰酸己基氨基羰基氨基)-6-甲基-4[1H]-嘧啶酮(UPy-NCO)与羟基功能化聚丁二烯(HTPB)反应得到UPy-HTPB-UPy，然后所得UPy-HTPB-UPy在365 nm紫外光下交联(光引发剂：联甲氧基-2-苯基苯乙酮，二甲基苯丙胺）。进一步的研究表明，可以通过改变光引发剂的量和紫外线曝光时间来调整所得聚合物的交联密度和机械性能。在紫外交联之前，由于四重氢键相互作用，UPy-HTPB-UPy被发现是类玻璃体的。链末端的 UPy 基团还能够在溶剂蒸发后快速固化。 HTPB链中的不饱和双键使UPy-HTPB-UPy能够在室温下以固态进行紫外交联。交联后，聚合物具有良好的形状记忆效应（SME）。在这里，我们证明这种类型的聚合物在增材制造中具有许多潜在的应用。在熔融沉积成型 (FDM) 和直接墨水书写 (DIW) 的情况下，通过印刷期间或印刷后的紫外线曝光（从热塑性塑料到热固性塑料），不仅可以增强层间粘合的强度，而且还可以增强聚合物本身的强度。交联后的SME进一步有助于实现随时随地的快速体积增材制造。
In this paper, a UV cross-linkable vitrimer-like polymer, ureidopyrimidinone functionalized telechelic polybutadiene, is reported. It is synthesized in two steps. First, 2(6-isocyanatohexylaminocarbonylamino)-6-methyl-4[1H]-pyrimidinone (UPy-NCO) reacts with hydroxy-functionalized polybutadiene (HTPB) to obtain UPy-HTPB-UPy, and then the resulted UPy-HTPB-UPy is cross-linked under 365 nm UV light (photo-initiator: bimethoxy-2-phenylacetophenone, DMPA). Further investigation reveals that the density of cross-linking and mechanical properties of the resulting polymers can be tailored via varying the amount of photo-initiator and UV exposure time. Before UV cross-linking, UPy-HTPB-UPy is found to be vitrimer-like due to the quadruple hydrogen-bonding interactions. The UPy groups at the end of the chain also enable for rapid solidification upon the evaporation of the solvent. The unsaturated double bonds in the HTPB chains enable UPy-HTPB-UPy to be UV cross-linkable in the solid state at room temperature. After cross-linking, the polymers have good shape memory effect (SME). Here, we demonstrate that this type of polymer can have many potential applications in additive manufacturing. In the cases of fused deposition modelling (FDM) and direct ink writing (DIW), not only the strength of the interlayer bonding but also the strength of the polymer itself can be enhanced via UV exposure (from thermoplastic to thermoset) either during printing or after printing. The SME after cross-linking further helps to achieve rapid volumetric additive manufacturing anytime and anywhere.
登录
查看更多内容
影响因子：
5.5
作者：
Gasperini, Andrea;Wang, Ging-Ji Nathan;Bao, Zhenan
通讯作者：
Bao, Zhenan
采用阴离子聚合丁苯橡胶精心定制的动态液晶网络，可调节形状记忆和自愈能力
影响因子：
5.5
作者：
Lei, Lan;Han, Li;Li, Yang
通讯作者：
Li, Yang
影响因子：
5.5
作者：
Lamers BAG;van der Tol JJB;Vonk KM;de Waal BFM;Palmans ARA;Meijer EW;Vantomme G
通讯作者：
Vantomme G
影响因子：
5
作者：
Wang TX;Chen HM;Salvekar AV;Lim J;Chen Y;Xiao R;Huang WM
通讯作者：
Huang WM
影响因子：
9.5
作者：
Hart, Lewis R.;Li, Siwei;Hayes, Wayne
通讯作者：
Hayes, Wayne