Fully recoverable rigid shape memory foam based on copper-catalyzed azide-alkyne cycloaddition (CuAAC) using a salt leaching technique.
Fully recoverable rigid shape memory foam based on copper-catalyzed azide-alkyne cycloaddition (CuAAC) using a salt leaching technique.
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基于铜催化叠氮化物-炔环加成（CuAAC）的完全可回收的刚性形状记忆泡沫，使用盐浸出技术。
DOI：
10.1039/c7py01121k
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发表时间：
2018-01-07
影响因子：
4.6
通讯作者：
Bowman CN
中科院分区：
文献类型：
--
作者：
Alzahrani AA;Saed M;Yakacki CM;Song HB;Sowan N;Walston JJ;Shah PK;McBride MK;Stansbury JW;Bowman CN
本研究首次使用铜催化叠氮-炔环加成(CuAAC)聚合，从具有较高玻璃化转变温度的定义良好的网络中形成坚韧而坚硬的多孔材料。通过比较CuAAC泡沫塑料和环氧胺基泡沫塑料(其骨架结构和力学性能相似的单体组成，CuAAC泡沫塑料的Tg为115℃，橡胶模数为1.0 Mpa，环氧胺泡沫塑料的Tg为125℃，橡胶模数为1.2 Mpa)，评价了CuAAC反应形成的网络键(即三唑)对高应变力学行为的影响。当每个泡沫在常温下被均匀压缩到80%应变时，环氧胺泡沫在第一次压缩循环中仅达到70%应变，韧性为300MJ/m~3，但破坏严重。相反，CuAAC泡沫在玻璃态下表现出显著的延展性，在第一次压缩到80%应变后，韧性提高了三倍，达到850MJ/m~3。此外，当CuAAC泡沫在五次压缩循环后在室温下加热到80%应变后的Tg以上时，泡沫完全恢复到原来的形状，但在多次压缩循环中表现出机械性能的逐渐下降。即使在连续的五个循环中，该泡沫也表现出几乎完全的形状固定和恢复率，这表明它具有“可逆塑性”，使其成为一种非常理想的玻璃态形状记忆泡沫。
This study is the first to employ the use of the copper-catalyzed azide-alkyne cycloaddition (CuAAC) polymerization to form a tough and stiff, porous material from a well-defined network possessing a high glass transition temperature. The effect of the network linkages formed as a product of the CuAAC reaction, i.e., the triazoles, on the mechanical behavior at high strain was evaluated by comparing the CuAAC foam to an epoxy-amine-based foam, which consisted of monomers with similar backbone structures and mechanical properties (i.e., Tg of 115 °C and a rubbery modulus of 1.0 MPa for the CuAAC foam, Tg of 125 °C and a rubbery modulus of 1.2 MPa for the epoxy-amine foam). When each foam was compressed uniformly to 80% strain at ambient temperature, the epoxy-amine foam was severely damaged after only reaching 70% strain in the first compression cycle with a toughness of 300 MJ/m3. In contrast, the CuAAC foam exhibited pronounced ductile behavior in the glassy state with three times higher toughness of 850 MJ/m3 after the first cycle of compression to 80% strain. Additionally, when the CuAAC foam was heated above Tg after each of five compression cycles to 80% strain at ambient temperature, the foam completely recovered its original shape while exhibiting a gradual decrease in mechanical performance over the multiple compression cycles. The foam demonstrated almost complete shape fixity and recovery ratios even through five successive cycles, indicative of “reversible plasticity”, making it highly desirable as a glassy shape memory foams.
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影响因子：
3.4
作者：
Liu, Yuyan;Han, Chunmiao;Du, Xingwen
通讯作者：
Du, Xingwen
影响因子：
3.9
作者：
Di Prima, M. A.;Gall, K.;Arzberger, S. C.
通讯作者：
Arzberger, S. C.
影响因子：
5.5
作者：
Baranek, Austin;Song, Han Byul;McBride, Mathew;Finnegan, Patricia;Bowman, Christopher N.
通讯作者：
Bowman, Christopher N.
影响因子：
29.4
作者：
Gong, Tao;Adzima, Brian J.;Bowman, Christopher N.
通讯作者：
Bowman, Christopher N.
影响因子：
4.1
作者：
Di Prima, M. A.;Lesniewski, M.;Campbell, D.
通讯作者：
Campbell, D.