Chinese Journal of Applied Chemistry ›› 2015, Vol. 32 ›› Issue (3): 342-349.DOI: 10.11944/j.issn.1000-0518.2015.03.140227

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Relationships Between Structures and Properties of Diallylmethylalkylammonium Bromide

TAO Xianpinga, *, ZHANG Yuejunb, *, LI Xiaa, JIA Xub   

  1. aCollege of Chemical and Biological Engineering,Nantong Professional Institute,Nantong,Jiangsu 226007,China
    bSchool of Chemical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China
  • Received:2014-06-30 Accepted:2014-09-29 Published:2015-03-02 Online:2015-03-02
  • Contact: Xianping TAO,Yuejun ZHANG
  • About author:Co-corresponding author:ZHANG Yuejun, professor;Tel:025-84315083; E-mail:zhyuejun@mail.njust.edu.cn;Research interests:synthesis, modification, application and structure activity relationship of surfactant and water-soluble polymer
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Abstract:

The properties and performances of four kinds of quaternary ammonium salt monomers were researched. The relationships between structures and properties or performances for the four kinds of diallylmethylalkyl(n=12,14,16,18) ammonium bromides(marked C12,C14,C16,C18) were discussed on the basis of the determination of the thermal stability, surfactivity and flocculation ability. Quaternary ammonium salts C12~C18 decompose within 170~300 ℃,172~303 ℃,170~293 ℃ and 170~310 ℃, their mass loss rates are 92.8%, 92.6%, 96.4% and 87.4%, respectively. Their critical micelle concentration(cmc) and the corresponding surface tension(γcmc) are 2.0, 3.5, 1.4, 1.1 mmol/L and 26.6, 25.2, 33.8, 35.8 mN/m, respectively. All monomers show excellent surfactivity. The quaternary ammonium salt C16 possesses the best foaming power and foam stability. C12 Krafft point is <0 ℃. Krafft points of C14, C16 and C18 are 1 ℃, 8 ℃ and 19 ℃, respectively. The C12 and C14 appear the strongest flocculation ability to bentonite and kaolin suspansion, indicating that the flocculation performance of monomers are of certain selectivity to structures.

 

Key words: diallylmethylalkylammonium bromides, quaternary salts, structures and properties, thermal stability, surfactivity, flocculation ability

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