Thermomechanical Formation-Structure-Property Relationships in Photopolymerized Copper-Catalyzed Azide-Alkyne (CuAAC) Networks.

Thermomechanical Formation-Structure-Property Relationships in Photopolymerized Copper-Catalyzed Azide-Alkyne (CuAAC) Networks.
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DOI:
10.1021/acs.macromol.6b00137
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发表时间:
2016-02-23
期刊:
影响因子:
5.5
通讯作者:
Bowman, Christopher N.
Bowman, Christopher N.
中科院分区:
化学1区
文献类型:
--
作者:
Baranek, Austin;Song, Han Byul;McBride, Mathew;Finnegan, Patricia;Bowman, Christopher N.

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对合成的多官能叠氮化合物和炔化合物库进行了本体光聚合,以发展CuAAC基聚合物网络的结构-性能关系。用铜催化剂和光引发剂配制多官能叠氮化物和炔,固化,并分析其机械性能。材料性质如玻璃化转变温度(Tg)显示出对单体结构的强烈依赖性,对于本研究中合成的一系列CuAAC单体,Tg值在41 ° C至90 °C范围内。与三唑相比,类似的基于硫醚的聚合物网络表现出低45-49 °C的Tg,而由醚代替氨基甲酸酯组成的类似单体表现出低40 °C的Tg。这里,在聚合过程中形成的三唑部分代表了一个关键的组成部分,在决定最终的聚合物网络的材料性能,其中材料性能,如橡胶模量,交联密度,和Tg都表现出强烈的依赖于聚合转化率,单体组成,和结构postgeleration。
Bulk photopolymerization of a library of synthesized multifunctional azides and alkynes was carried out toward developing structure–property relationships for CuAAC-based polymer networks. Multifunctional azides and alkynes were formulated with a copper catalyst and a photoinitiator, cured, and analyzed for their mechanical properties. Material properties such as the glass transition temperatures (Tg) show a strong dependence on monomer structure with Tg values ranging from 41 to 90 °C for the series of CuAAC monomers synthesized in this study. Compared to the triazoles, analogous thioether-based polymer networks exhibit a 45–49 °C lower Tg whereas analogous monomers composed of ethers in place of carbamates exhibit a 40 °C lower Tg. Here, the formation of the triazole moiety during the polymerization represents a critical component in dictating the material properties of the ultimate polymer network where material properties such as the rubbery modulus, cross-link density, and Tg all exhibit strong dependence on polymerization conversion, monomer composition, and structure postgelation.
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