Chemical and Biomolecular Engineering, University of Melbourne , Parkville, VIC 3010, Australia.
CSIRO Mineral Resources Flagship, Clayton, VIC 3168, Australia.
Langmuir. 2016 Aug 2;32(30):7443-51. doi: 10.1021/acs.langmuir.6b00211. Epub 2016 Jul 19.
Xanthate-functional polymers represent an exciting opportunity to provide temperature-responsive materials with the ability to selectively attach to specific metals, while also modifying the lower critical solution temperature (LCST) behavior. To investigate this, random copolymers of poly(N-isopropylacrylamide) (PNIPAM) with xanthate incorporations ranging from 2 to 32% were prepared via free radical polymerization. Functionalization with 2% xanthate increased the LCST by 5 °C relative to the same polymer without xanthate. With increasing xanthate composition, the transition temperature increased and the transition range broadened until a critical composition of the hydrophilic xanthate groups (≥18%) where the transition disappeared completely. The adsorption of the polymers at room temperature onto chalcopyrite (CuFeS2) surfaces increased with xanthate composition, while adsorption onto quartz (SiO2) was negligible. These findings demonstrate the affinity of these functional smart polymers toward copper iron sulfide relative to quartz surfaces, presumably due to the interactions between xanthate and specific metal centers.
黄原酸酯功能聚合物为提供对特定金属具有选择性附着能力的温度响应材料提供了一个令人兴奋的机会，同时还可以改变低临界溶液温度（LCST）行为。为了研究这一点，通过自由基聚合制备了聚（N-异丙基丙烯酰胺）（PNIPAM）与黄原酸酯结合物的比例从 2%到 32%的无规共聚物。与不含黄原酸酯的相同聚合物相比，用 2%的黄原酸酯官能化将 LCST 提高了 5°C。随着黄原酸酯组成的增加，转变温度升高，转变范围变宽，直到亲水性黄原酸酯基团的临界组成（≥18%），此时转变完全消失。聚合物在室温下对黄铜矿（CuFeS2）表面的吸附随黄原酸酯组成的增加而增加，而对石英（SiO2）的吸附可以忽略不计。这些发现表明这些功能智能聚合物对铜铁硫化物相对于石英表面的亲和力，可能是由于黄原酸酯与特定金属中心之间的相互作用。
