Department of Polymer Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata, 700009, West Bengal, India.
Department of Polymer Science and Technology, University of Calcutta, 92 A.P.C. Road, Kolkata, 700009, West Bengal, India.
Carbohydr Polym. 2021 Apr 15;258:117704. doi: 10.1016/j.carbpol.2021.117704. Epub 2021 Jan 29.
In comparison to conventional nanoparticles biopolymer like chitosan based nanoparticles will be of much lower cost, non-toxic and more compatible with polymer membranes. As a cationic polymer surfactant chitosan is able to generate polymer nanoparticles during emulsion polymerization of methyl methacrylate. Accordingly, the organophilicity of polyvinyl chloride (PVC) membrane was significantly improved by incorporating chitosan grafted polymethyl methacrylate (PMMA) nanopolymers(NPs) prepared by emulsion polymerization. The NPs and the PVC-NP blend membranes were characterized. The chitosan: MMA wt. ratio and the wt.% of NP in PVC were optimized by a 5-level factorial design. The membranes prepared from i) PVC, PVC blended with 6.5 wt.% each of ii) chitosan, iii) PMMA and iv) NP showed a pervaporative flux (kg/mh)/acetone selectivity of 0.439/24.31, 0.477/21.56, 0.461/23.41 and 0.502/27.96, respectively for 5.6 wt.% acetone in feed. The sorption and pervaporation data showed close fitting to ENSIC and six-parameter solution-diffusion model, respectively.
与传统纳米颗粒相比，生物聚合物如壳聚糖基纳米颗粒的成本要低得多，而且毒性更小，与聚合物膜的相容性更好。壳聚糖作为一种阳离子聚合物表面活性剂，能够在甲基丙烯酸甲酯的乳液聚合过程中生成聚合物纳米颗粒。因此，通过乳液聚合制备的壳聚糖接枝聚甲基丙烯酸甲酯（PMMA）纳米聚合物（NPs）可以显著提高聚氯乙烯（PVC）膜的亲油性。对 NPs 和 PVC-NP 共混膜进行了表征。通过 5 水平析因设计优化了 NPs 中壳聚糖：MMA 的重量比和 PVC 中的 NP 重量百分比。由 i）纯 PVC、ii）每 6.5wt% 壳聚糖、iii）PMMA 和 iv）NP 共混的 PVC 制备的膜在进料中含有 5.6wt% 的丙酮时，表现出的渗透通量（kg/mh）/丙酮选择性分别为 0.439/24.31、0.477/21.56、0.461/23.41 和 0.502/27.96。吸附和渗透数据分别与 ENSIC 和六参数溶液扩散模型拟合良好。
