The effect of p-tert-Butylcalix[4]arene on rubber-nylon-6 fabric and rubber-metal bead wire adhesion strength was quantified. For this purpose, two typically used rubber compounds were employed for two reinforcing motorcycle tire components: ply and bead. The standard pull-out tests of rubber–fabric and rubber–metal showed improvements in adhesion strength by incorporating p-tert-Butylcalix[4]arene into rubber compounds. However, the maximum values of adhesion force to pull the polyamide fabrics and brass-coated metal wires out of the rubber compounds were observed when only 1.0 phr of p-tert-Butylcalix[4]arene was used. The adhesion performance of both fabric and metal wire decreased with higher loading amounts of p-tert-Butylcalix[4]arene. The effect of a commercial phenolic tackifying resin was also evaluated in bead compound. Very similar adhesion results to p-tert-Butylcalix[4]arene were obtained when using 1.0 phr phenolic resin.
In an effort to use a polymer carrier for the maintenance of biological activity of metal complexes; in this report, a novel cobalt(III) complex, trans‐[Co(en)2(mtzt)2]NO3 (1) was prepared (en=ethylenediamine and Hmtzt=1‐methyl‐1‐H‐1,2,3,4‐tetrazol‐5‐thiol) and fully characterized. A biocompatible di‐block polymer, containing poly lactic‐co‐glycolic acid and poly ethylene glycol (PLGA‐PEG), was employed as the nanocarrier of complex 1 to achieve more efficacy and controlled drug release. Results illustrated that the successful loading of the cobalt complex on the PLGA‐PEG polymer as well as pH dependent drug release with approximately 17%, 58% and 74% release within 168 hours at pH=7.4, 5.8 and 4.8 respectively. Antibacterial properties of complex 1 and corresponding nanocarrier have been determined against gram‐negative (Escherichia coli) and gram‐positive (Staphylococcus aureus) bacteria where the loading of the complex on nanocarrier enhances its antibacterial activity. Their anticancer activity was also evaluated over human ovarian carcinoma cells and compared with cisplatin.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.