Free-standing ultrathin films of a porphyrin homopolymer have been synthesized by interfacial polymerization of a mercaptoporphyrin. Coupling of 5,10,15,20-tetrakis(α-mercapto-p-tolyl)porphyrin at the water/chloroform interface by copper acetate yields continuous, flexible films after drying with supercritical CO2. These films are amorphous and retain many characteristics of the monomeric porphyrin, such as the property that they may be metalated. Spectroscopic evidence suggests efficient cross-linking of thiols through disulfide coupling occurs in these polyporphyrins to form a network. Polymerization is accompanied by the introduction of carbonyl functionality, probably the transformation of residual thiols to thioacetate by metal-mediated reaction with excess acetate ion. As an example of the catalytic properties of these polymers, they are shown to promote photooxidation of thietane to the corresponding sulfoxide by sensitizing singlet oxygen production.
With the development of mobile Internet and 5g communication technology, online learning has become an important channel for different people to accumulate knowledge. Autonomous learning often ignores learners' emotional interaction, while online collaborative learning mainly depends on learners' cooperation and communication. Taking the undergraduates of a 211 university in Beijing as the research object, this study compiled a questionnaire on the impact of emotional interaction on learners' knowledge construction under the online collaboration mode, and demonstrated the intermediary role of emotional interaction in learners' online collaborative learning in knowledge construction. The empirical results show that the designed questionnaire is effective α the coefficient is 0.891, greater than 0.8. Therefore, the questionnaire has good reliability. The kmo value is 0.876 and the corresponding p value is 0. Therefore, this questionnaire has good validity. Emotional response and expression significantly promote the establishment of learners' knowledge construction. Online collaboration plays a complete intermediary role in the positive promotion of emotional interaction on learners' knowledge construction. The results of this study are of great reference value to the establishment of an Internet plus based learning environment model based on the interaction and cooperation of web-based learners.
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