Study on the acidic hydrolysis process of poly(N‐vinylformamide/acrylonitrile) fiber

Abstract

A convenient method of preparing chelating fiber with amine groups on the fiber surface was developed. The precursor polymer of Poly(N-vinylformamide/acrylonitrile) (P(NVF/AN)) was synthesized via solution polymerization, using N-vinylforaimde as a functional monomer. The solution of P(NVF/AN) was spun through a wet spinning method and the precursor fiber was hydrolyzed in the hydrochloric acid solution to convert formamide moieties to the corresponding amine. The influence of hydrolytic conditions on hydrolysis degree, such as hydrolysis temperature, hydrolysis time, and hydrochloric acid concentrations were examined experimentally. The hydrolysis degree of the precursor fiber was evaluated by potentiometric and conductometric titrations.The changes of the structure and properties of the fibers were characterized through infrared spectroscopy, scanning electron microscopy, and tensile strength tester. The results showed that the hydrolysis degree was limited in acidic hydrolysis because of the electrostatic repulsion among the cationic amine groups and proton. The hydrolysis degree of precursor fiber reached nearly 60%, and the chelating fiber remained the adequate mechanical properties under the suitable hydrolysis condition.

Radical Copolymerization of N‐Vinylformamide with Methylvinylketone: An Approach to Iminium/Imine Ring Containing Polymers

“…Alkaline hydrolysis of acrylate/NVF copolymers generates insoluble lactam polymers caused by intramolecular neighbor group reactions . A similar behavior is observed during acidic hydrolysis of acrylonitrile/NVF where amidinium structure formation takes place …”

“…Numerous publications clearly indicate the excellent copolymerization abilities of NVF . The copolymerization of NVF with vinyl monomers possessing electron deficient CC double bonds such as acrylates, acrylamides, or maleates yields copolymers with alternating tendencies, while copolymerization with ethylene or vinyl esters forms random types of copolymers .…”

Chelating Materials Immobilizing Carboxymethylated Pentaethylenehexamine and Polyethyleneimine as Ligands

“…This technique is applicable for the preparation of fibers containing various materials, such as activated carbon, 94 graphene, 95 multi-walled carbon nanotube, 96 titanium dioxide, 97 and platinum nanoparticle, 98 as well as chelating ligand. 99,100 Chelating fibers containing fine particulate CM-PEHA resin 101 and CM-PEI 102,103 were prepared based on this technique, and the potential of the chelating fibers for the solid-phase extraction of elements was investigated.…”

Intermolecular association and supramolecular structures of PNVF–LiPFN and PVP–LiPFN complexes in the aqueous phase

“…PNVF has been applied in some practical uses, such as coating slips, petroleum recovery, hair care, protein release, fibers, and the drag reducing polymers. [32][33][34][35][36][37][38] Our previous study 13 showed that PNVF strongly interacts with SDS, and the cac of SDS in the presence of PNVF is ca. 3.0 mM.…”