Poly-N-vinylcaprolactam, also known as PNVCL, is a very promising drug controlled release agent, and it also plays an important role in artificial muscles, drug controlled release systems, membrane separation and chemical valves.
N-Vinyl Caprolactam (NVCL) is a non-conjugated monomer. The structure of PNVCL obtained by different polymerization methods is very different, which is directly reflected in the molecular weight distribution and indirectly affects the temperature sensitivity and phase transition temperature of PNVCL and other performance indicators. Homopolymerization by free radical solution method uses water or isopropanol as the solvent, but the molecular weight distribution is wide. The required free radicals can also be induced by gamma-ray radiation. Reversible addition fragmentation chain transfer (RAFT) method can be used to obtain polymers with narrow molecular weight distribution.
The polymer film formers in a number of patents related to hair care all contain PNVCL. In the past, shellac used for hair styling was replaced by aerosol PNVP, which is easy to clean due to the difficulty of combing. However, aerosols are volatile organic compounds and are prohibited by environmental protection regulations. After that, the aerosol type hair spray market gradually declined, hair styling hair sprays developed rapidly, and the demand for mousses and styling gels increased. PNVCL series polymers are widely used in hair styling products due to their good film forming characteristics.
Around the characteristics of N-vinyl caprolactam monomer, people have carried out a lot of research work on its homopolymerization and copolymerization methods, involving free radical solution polymerization, RAFT polymerization and precipitation polymerization. The properties and application fields of homopolymers and copolymers cover many fields such as sustained drug release, responsive catalysis, and chromatographic separation of proteins. The number of monomers involved in copolymerization is increasing, and the functions of materials are becoming more and more abundant. According to the analysis of reported literature data, this polymer series has broad development prospects.