Yasir Mohammad, Hu Brian, Lin Ting-Chih, Matyjaszewski Krzysztof
Department of Chemistry, Carnegie Mellon University, 4400 Avenue, Pittsburgh, Pennsylvania 15213, United States.
Department of Chemistry, Physics, and Atmospheric Sciences, Jackson State University, 1400 Lynch Street, Jackson, Mississippi 39217, United States.
Langmuir. 2025 Jan 14;41(1):378-382. doi: 10.1021/acs.langmuir.4c03654. Epub 2024 Dec 31.
Structurally tailored and engineered macromolecular (STEM) networks are attractive materials for soft robotics, stretchable electronics, tissue engineering, and 3D printing due to their tunable properties. To date, STEM networks have been synthesized by atom transfer radical polymerization (ATRP) or the combination of reversible addition-fragmentation chain-transfer (RAFT) polymerization and ATRP. RAFT polymerization could have limited selectivity with ATRP inimer sites that can participate in radical-transfer processes. On the other hand, living ring-opening metathesis polymerization (ROMP) can produce a polymeric network with latent ATRP initiator sites in high selectivity. Herein, for the first time, we report the syntheses of STEM zero-generation (STEM-0) networks using a monomer, a cross-linker, and an ATRP/ROMP inimer via living ROMP, followed by their modification using a second monomer via ATRP to synthesize STEM first-generation (STEM-1) networks. The mechanical property and swelling capacity analyses of these networks were carried out. A change in mechanical properties and swelling capacity of these networks was observed due to their structural modification.
结构定制和工程化的大分子（STEM）网络因其可调谐性能，是用于软机器人技术、可拉伸电子器件、组织工程和3D打印的有吸引力的材料。迄今为止，STEM网络已通过原子转移自由基聚合（ATRP）或可逆加成-断裂链转移（RAFT）聚合与ATRP的组合来合成。RAFT聚合对可参与自由基转移过程的ATRP引发剂位点的选择性可能有限。另一方面，活性开环易位聚合（ROMP）可以高选择性地产生具有潜在ATRP引发剂位点的聚合物网络。在此，我们首次报道了使用一种单体、一种交联剂和一种ATRP/ROMP引发剂通过活性ROMP合成STEM零代（STEM-0）网络，随后通过ATRP使用第二种单体对其进行改性以合成STEM第一代（STEM-1）网络。对这些网络进行了力学性能和溶胀能力分析。由于其结构改性，观察到这些网络的力学性能和溶胀能力发生了变化。
