Synthesis And Application Of Poly (dimethyl-Diallyl Ammonium Chloride)

Dimethyldiallylammonium chloride polymers, a kind of cationic organic polymercompounds, display fine regulate performance when used in hair and skin products. Cationicpolyquaternium PDMDAAC was obtained in aqueous solution with AIBI·2HCl as theinitiator through the polymerization of the intermediate, which was synthesized inexperiments in this paper. The regulate performance of the product in Shampoo andConditioner was studied preliminarily and compared with DMDAAC copolymers.The monomer DMDAAC was synthesized through two steps with the synthesis ofdimethyl diallyl tertiary amine as the first step and that of polyquaternium after separatingdimethyl diallyl tertiary amine as the second step. The optimum technological conditions forobtaining tertiary amine were as follows: Allyl chloride and sodium hydroxide were droppedalternately into the aqueous solution of dimethylamine under the temperature of5℃at thetime interval of10minutes, dimethylamine, allyl chloride and sodium hydroxide in a molarratio of1.2:1:1. Pure tertiary amine was obtained through distillation and drying of the coarseproduct. The optimum technological conditions for the quaternization were as follows:reaction temperature was45℃, n (allyl chloride):n(tertiary amine)=1:1, and reaction time was5hours. The yields of the two steps were82.9%and87%respectively and the total yieldexceeded70%.Poly(dimethyldiallylammonium chloride) were synthesized with2,2’-azobis[2-methyl-propionamidine] dihydrochloride as the initiator. Many factors influencing intrinsic viscosityof product and conversion rate of monomer were researched in this paper, includingconcentration of monomer, additive amount of initiator and complexing agent, reactiontemperature, reaction time and methods of initiator addition. The optimum technologicalconditions were as follows: concentration of monomer was62.5%, additive amount ofinitiator and complexing agent were0.75%and0.010%respectively, the reaction time was7hours and initiator was added at a time. The intrinsic viscosity of product was1.48dL·g-1and conversion rate of monomer was91.4%.The structure of the polymerization product wascharacterized by FT-IR and1H-NMR spectroscopy. The application in Shampoo andConditioner of PDMDAAC was also researched and it was found that PDMDAAC couldn’tbe concerted well with common anionic and amphoteric surfactants while showed finecompatibilities with cationic surfactants. PDMDAAC could reduce dry and wet frictioncoefficients of surface of the hair and improve dry and wet combing properties.Two common DMDAAC copolymers were obtained, namely P(DMDAAC/AM) andP(DMDAAC/AA/AM), and both had high conversion rate and intrinsic viscosity. Besides,The copolymers mentioned above had good compatibilities with common surfactants in awide range, increased viscosity of shampoo system effectively while reduced foamabilityslightly, and improved dry and wet combing properties significantly. The adsorption form inhair was watched by scanning electron microscopy and it was found that P(DMDAAC/AM)and P(DMDAAC/AA/AM) boasted fine film-forming abilities. Therefore, DMDAACcopolymerization polyquaternium could be applied into ‘2-in-1’ shampoo with excellentregulate performance.