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Citation: CAO Du, XIA Yong, YAO Hongtao, QI Zhengjian, SUN Yu, LI Fengfu. Synthesis of Linear Oligomer of Dimethyltetrasiloxane[J]. Chinese Journal of Applied Chemistry, ;2015, 32(5): 527-534. doi: 10.11944/j.issn.1000-0518.2015.05.140326 shu

Synthesis of Linear Oligomer of Dimethyltetrasiloxane

CAO Du ^a ,
XIA Yong ^a ,
YAO Hongtao ^a ,
QI Zhengjian ^a,, ,
SUN Yu ^b ,
LI Fengfu ^b

1.
a College of Chemistry and Chemical Engineering, Southeast University, Nanjing 211189, China;
2.
b Jiangsu Maysta Chemical Co. Ltd., Nanjing 210046, China

Corresponding author: QI Zhengjian,
Received Date: 19 September 2014
Available Online: 28 January 2015
Fund Project: 江苏省科技支撑项目(工业支撑BE2012810) (工业支撑BE2012810)2013年普通高校研究生科研创新计划项目基金(CXLX13_106) (CXLX13_106)

Linear dimethyltetrasiloxane(MD₄M) was synthesized using octamethylcyclotetrasiloxane(D₄) and hexamethyldisiloxane(MM) as raw materials and solid super acid(SA) TiO₂/SO₄^2- as catalyst.The influence of reaction time,reaction temperature,amount of relative molecular mass modifier(MM) and catalyst dosage on the degree of polymerization and the content of the product was studied by uniform design experiments and single factor experiments.Experiment results showed that the optimum reaction conditions are as follows:the molar ratio of octamethylcyclotetrasiloxane to hexamethyldisiloxane) is 0.75:1,the catalyst loading is 2%(mass fraction) of the total reactants,the reaction temperature is 100℃ and the reaction time is 7 h.The reaction conversion is 87% and the yield of MD₄M is 16.8% which is 1.6% more than the sulfuric acid system.The catalyst(SA) can be recycled more than 3 times without the loss of its catalytic activity.The macro-kinetics model of the ring-opening polymerization of D₄ with solid super acid as the heterogeneous catalyst was also created using the quasi-homogeneous system.
- solid super acid,
- dimethyltetradesiloxane,
- dynamics
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