Gaines Taylor W, Nakano Tatsuya, Chujo Yoshiki, Trigg Edward B, Winey Karen I, Wagener Kenneth B
Butler Polymer Research Laboratory, Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, United States.
Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan.
ACS Macro Lett. 2015 Jun 16;4(6):624-627. doi: 10.1021/acsmacrolett.5b00258. Epub 2015 May 20.
Copolymers containing sulfite functionalities precisely placed between run lengths of 8, 14, and 20 methylene units were synthesized via ADMET with weight-average molecular weights up to 40 500 g/mol (PDI = 1.89). No such polymer structures have been observed previously. The primary polymer structures and precise nature were characterized by H NMR, C NMR, and IR spectroscopy. Thermal degradation temperatures up to 310 °C were observed through TGA, and melting points typical of similar unsaturated ADMET polymers were determined by DSC. X-ray scattering was used to compare the polymers to ADMET polyethylene (PE), and when the polymers have 20 carbons between sulfites, the functional groups self-assemble into layers. Higher carbon content incorporation leads to an increase in crystallinity and thermal stability for these polysulfites.
通过开环易位聚合反应（ADMET）合成了在8个、14个和20个亚甲基单元的链段之间精确排列有亚硫酸盐官能团的共聚物，其重均分子量高达40500 g/mol（分散度PDI = 1.89）。以前从未观察到过这种聚合物结构。通过氢核磁共振（H NMR）、碳核磁共振（C NMR）和红外光谱（IR）对主要聚合物结构和精确性质进行了表征。通过热重分析（TGA）观察到热降解温度高达310℃，并通过差示扫描量热法（DSC）测定了类似不饱和ADMET聚合物典型的熔点。利用X射线散射将这些聚合物与ADMET聚乙烯（PE）进行比较，当聚合物中亚硫酸盐之间有20个碳原子时，官能团会自组装成层。对于这些聚亚硫酸盐，较高的碳含量引入会导致结晶度和热稳定性增加。
