Effects of maintaining temperature and time on properties and structures of poly(dimethyldiallylammonium chloride)

Abstract

Effects of maintaining temperature (T3) and time (t) on properties and structures of product poly(dimethyldiallylammonium chloride) (PDMDAAC) are researched in this article. The results showed that higher the T3 shorter the time t needed for polymer products' intrinsic viscosity ([η]) and monomer conversion (Conv.) to reach their maximum values. The maximum [η] was 4.69 dL g−1 and corresponding Conv. was 100.00%, when t = 96 h and T3 = 55°C. The reaction phenomena and products' FTIR and NMR spectra indicated the possible reasons for the increase of [η], the formation of branched and crosslinked products after the conversion was more than 100.00% in T3 term were the results of polymerization happened among the residual monomers, hanging and terminal double bonds. Compared with solubility of products, it was found that the time needed for dissolving the linear, branched, and crosslinked PDMDAAC products increased in turn, whereas their dissolved amount decreased reversely. The linear product's Mw, Mw/Mn, and Rg measured by GPC‐MALLS were 4.169 × 106, 5.109, and 127.7 nm, respectively. Meanwhile, the linear and crosslinked products were characterized by DTA‐TG. © 2011 Wiley Periodicals, Inc. J Appl Polym Sci, 2012

Quantitative Analysis of Volatile Impurities in Diallyldimethylammonium Chloride Monomer Solution by Gas Chromatography Coupled with Liquid-Liquid Extraction

“…The results in Table 4 showed that the contents of these impurities in DADMAC samples were different from each other. The molecular weights (calculated by intrinsic viscosity [ η ]) of poly-DADMACs changed with the variation of the sorts of impurities and their contents even under the same optimum polymerization condition [14], so that it could further not only prove the obvious effect of the impurities on the molecular weight of polymer products, but also illustrate the importance to establish a product quality standard for promoting the overall level of the DADMAC production in industry.…”

“…As a result, the research on the products with high and serial molecular weight or the products with controlled molecular weight distribution is always the key point [14]. However, for DADMAC-based polymers formed from radical polymerization, the species, and amounts of impurities in DADMAC monomer solution have been considered to be one of the key influencing factors on the polymerization and product molecular weights, in addition to the polymerization technology [15], the sorts and amounts of initiators [16], and so on.…”

A new indicator of ionic polymeric flocculants for the removal of heavy metals anions: Specific charge density

“…The specific preparation conditions of PDADMAC are listed in Supporting Information Table S1. Compared with previous studies, the preparation of high SCD PDADAMC required lower temperature and more initiators (Jia & Zhang, 2010, 2012.…”

“…In order to investigate the effect of PDADMAC with different SCD values on flocculation process, the PDADMAC samples with different SCD values were prepared by adjusting temperature and time of reaction, and mass ratio of initiator and promoter in the reaction solution. The preparation reaction of PDADMAC was a typical free radical polymerization (Jia & Zhang, ). The DADMAC monomer solution was placed into polymerization apparatus with thermometer and water bath.…”

Online monitoring of diallyldimethylammonium chloride polymerization

“…Practical importance of DADMAC homopolymer and copolymer studies involving polymerization mechanism and kinetics, molecular characterization, and solution properties of this system have drawn great interest. Highly hygroscopic nature of PDADMAC causes difficulties in characterization polymerization reaction by chemical methods or isolation and gravimetrically . The electrostatic repulsion between the ion and the charged macroradical depend on the pH value of the medium and the concentrations of ionic species.…”