Study On Intercalation, Cyclopolymerization And Properties Of Diallyldialkyl Ammonium Quaternary Salts In Montmorillonite

Diallyldimethyl quaternary ammonium salt(DM) is a cationic organic molecule with double unsaturated bond.It has many advantages such as high efficiency,high density of positive charge,and so on.Thus it has been industrialization.However,other quaternary ammonium salt has not been extensive investigated.Based on DM,a series of diallyldialkyl ammonium bromide(CxCx), diallylmethyl alkyl ammonium bromide(CCx),dimethyldihexadecyl ammonium bromide[2(CH₃C₁₆)]and allylmethyldidodecyl ammonium bromide (SC₁₂C₁₂) were synthesized.Here,X is alkyl's chain length,represents 12,14, 16 and 18 respectively.They were characterized by element analysis,nuclear magnetic resonance(NMR),mass spectrometer(MASS) and fourier transform infrared spectrometry(FT-IR).The results indicate that a series of purified monomer are obtained.The obtained monomers were used to modify montmorillonite(MMT).The organically modified MMT were characterized by XRD,TGA,FT-IR and so on. The results of MMT modified by monomer show that monomer could intercalate into MMT's layer.It is nonlinearity relationship between organic MMT's layer distance in XRD and organic decompound weight in TGA.FT-IR results indicate that the water absorption on the surface of MMT is influenced by content and hydrophobic of organic.The peaks at 924 cm^-1 and 2854 cm^-1 from the C-H stretching vibration are changed consistent with the organic weight in TGA.Hydrophobic modified gel(PCCx-MAA) was prepared by using CCx and methacrylic acid(MAA) in water.Polymer diallylmethyl alkyl ammonium bromide-methacrylic acid(PHC₁₆-MAA) was prepared using diallylmethyl alkyl ammonium chloride and MAA.Contract to PCCx-MAA gel,the effect of N⁺ on gel's swelling was studied.The results show that pH responsive behavior of PCCx-MAA is in line with polymer methacrylic acid(PMAA) gel.The equilibrium swellling time of PCC₁₆-MAA gel is more than polymer gel prepared using CC₁₂,CC₁₄ and CC₁₈ respectively.The swelling kinetics indicate that the hydrophobic alkyl chain units can slow down the swelling rate of the gels.Diffusion exponent of gels in acidic or alkaline media is controlled by content of hydrophobic chain.The crystallization capacity of PCC₁₆-MAA gels is easier than PHC₁₆-MAA in side-chain.This should be a consequence of PCC₁₆-MAA hydrogel consist of carboxylic acid,nitrogen positive ion and hydrophobic alkyl chain's content.Polymer diallyldimethyl ammonium chloride(PDM),polymer diallyldimethyl ammonium chloride -acrylamide(PDM-AM) and polymer diallyldimethyl ammonium chloride-acrylamide -glyoxal(PDM-AM-GL) were prepared via free radical polymerization respectively.Series of PDM/ montmorillonite nanocomposites(PDM/MMT),PDM-AM/ montmorillonite nanocomposites(PDM-AM/MMT) and PDM-AM-GL/montmorillonite nanocomposites(PDM-AM-GL/MMT) were prepared respectively.The nanocomposites were studied by using monomer conversion,characteristic viscosity of the polymer and system rotational viscosity of nanocomposites respectively.The results of nanocomposites show that monomer conversion, polymer intrinsic viscosity and system rotational viscosity are consistent with the change of MMT's layer distance.The effect of MMT's dosage on cyclopolymerization of PDM was studied. The distance of MMT's layer was measured by XRD.The monomer and polymer structure were characterized by FT-IR,proton and carbon-13 nuclear magnetic resonance as well as DEPT techniques.The structure of polymer dimethyldiallyl ammonium chloride separated from nanocomposites is still kept five-ring structure.The molecular weight of PDM separated from PDM/MMT is influenced by dosage of MMT.Series of molecular weight of PDM-AM was prepared.The MMT was modified by purified,unpurified and protonized PDM-AM respectively,and measured by XRD.The results of MMT modified by PDM-AM indicate that purified polymer can intercalate into MMT's layer.Unreaction monomer in polymer is not advantaged for polymer intercalation into MMT's layer.It is not influenced MMT modified by protonized.It was not linearity relationship between organic MMT's layer distance and dosage of MMT,which similar to assemble phenomena of surfactant.Nanocomposites with 2%chromate were applied in leather process. Application results show that PDM/MMT can increase leather tensile strength and tear strength,compared with 2%chromate tanned leather.The tannage effect of PDM-AM and PDM-AM/MMT on leather is not good.The properity of wetting stability and fillness tanned by PDM-AM-GL/MMT is better than leather tanned by 2%chromate.It is provided industrial foundation for diallyldialkyl quaternary ammonium salts.It is exploit a new research field for diallyldialkyl quaternary ammonium salts that study on pH responsive and nanocomposites.