Abhishek N. Mondal,Congliang Cheng,Muhammad Imran Khan,Md. Masem Hossain,Kamana Emmanuel,Liang Ge,Bin Wu,Yubin He,Jin Ran,Xiaolin Ge,Noor Ul Afsar,Liang Wu,Tongwen Xu
Rapid development of diffusion dialysis based on anion exchange membranes (AEMs) established its prominent significance as a leading candidate in the field of separation science and technology. AEM-based diffusion dialysis (DD) processes intended to acid recovery have generated much interest due to their exclusive selectivity. Here, we report the effects of novel Poly(DMAEM-co-γ-MPS)-based AEMs for DD applications (acid recovery). Free radical polymerization was successfully done with the initiator azobisisobutyronitrile (AIBN) to achieve the desired polymer Poly(DMAEM-co-γ-MPS). Finally, quaternization with EPTAC and methyl iodide was done to make the membrane matrix charged. The dosage of Poly(DMAEM-co-γ-MPS) inside membrane matrix plays a crucial role to determine the physiochemical and electrochemical properties of the prepared membranes. The influence of Poly(DMAEM-co-γ-MPS) on the acid recovery behavior of the membranes was explored in detail. The prepared membranes displayed high thermo-mechanical stability. At 25 °C, the acid dialysis coefficient (U H ) values were between 0.016–0.029 m/h, while the separation factors (S) ranged from 23.3 to 87.7. Both the acid recovery (7.25 times) and separation factors (~3.6 times) are much higher than the commercial fiber supported anion exchange membrane DF-120B (U H and S=0.004 m/h and 24.3, respectively). Prepared AEMs are the potent candidate for acid recovery via diffusion dialysis. The highlight of this work is the fabrication of new AEMs, which shows high acid dialysis performance and selectivity.
Qingqing Yu,Weijun Yang,Qianqian Wang,Weifu Dong,Mingliang Du,Piming Ma
In this work, functionalized cellulose nanocrystal (fCNC) was obtained by the grafting of 3-methacryloxypropyltrimethoxysilane coupling agent (γ-MPS) onto CNC. Then acrylic pressure sensitive adhesive (PSA) incorporated with various contents of CNC or fCNC was successfully synthesized by an in-situ emulsion polymerization , and the effects of CNC or fCNC on the sol molecular weight, latex properties, thermal properties, viscoelastic properties, and adhesive performance of the acrylic PSA were investigated. The results illustrated a coinstantaneous improvement of tack, shear strength and peel strength with increasing the loading of both CNC and fCNC. Interestingly, fCNC showed much more improvement than CNC on adhesive performance of acrylic PSA. The fCNC-1/acrylic PSA showed tack of 27#, shear strength of 70 h, and peel strength of 13.4 N/25mm, which were 12.5%, 4%, and 106% higher than those of CNC-1/acrylic PSA and 35%, 100%, and 163% higher than those of neat acrylic PSA, respectively. The superior adhesive performance of the fCNC/acrylic PSA films was supposed to be attributed to better compatibility and dispersion of fCNC in the acrylic copolymer. Thus, this work presents a feasible strategy for utilization of CNC in adhesives and coatings.
危险品化学品经营许可证（带存储）