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Titanocene compound catalyst and method for preparing syndiotactic polystyrene thereby

A compound and catalyst technology, applied in the field of syndiotactic polystyrene preparation, can solve the problem of low catalytic activity and achieve high catalytic activity

Inactive Publication Date: 2008-06-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Non-procene titanium and zirconium metal catalytic systems are mainly composed of β-diketone titanium complexes, 8-hydroxyquinoline titanium complexes, β-binaphthol titanium complexes and other non-procene zirconium complexes and polyaluminoxanes. or boron compounds, but the catalytic activity is not high

Method used

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  • Titanocene compound catalyst and method for preparing syndiotactic polystyrene thereby
  • Titanocene compound catalyst and method for preparing syndiotactic polystyrene thereby

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Example 1Cp * Ti(O-Ph-Cl) 3 Synthesis

[0013] 1. Synthesis of Pentamethylcyclopentadiene:

[0014] Heat 350mL of sec-butanol and 500mL of phosphoric acid (excessive) to 110°C for reaction, make the generated butadiene gas pass through the serpentine tube cooled by ice-water bath, enter 2000g of liquid bromine for reaction, and control the reaction temperature at -15°C with ice-salt bath Between -10°C, react until the liquid bromine changes from reddish brown to light yellow, and the product is subjected to liquid separation extraction and vacuum distillation to obtain 1570g of relatively pure 2,3-dibromobutane, with a yield of 58.1%, protected from light save. Put the mixed 119.3g potassium hydroxide, 22mL water and 205mL ethylene glycol into the constant pressure funnel, control the flow rate for 2 hours and add dropwise to 350g 2,3-dibromobutane heated to 100°C and mix with 140mL ethylene glycol Then reflux at 110°C for 2 hours to distill off, collect the crude p...

Embodiment 2

[0019] Example 2Cp * Ti(O-Ph-F) 3 Synthesis

[0020] O-fluorophenol replaces o-chlorophenol in Example 1, and other reaction conditions are the same. Elemental Analysis C 23 h 27 o 3 f 3 Ti: theoretical value: 65.05% for C, 5.421% for H; measured value: 64.48% for C, 5.430% for H.

Embodiment 3

[0021] Example 3Cp * Ti(O-Ph-CH 3 ) 3 Synthesis

[0022] Ortho-cresol replaces the ortho-chlorophenol in embodiment 1, and other reaction conditions are identical. Elemental Analysis C 29 h 45 o 3 Ti: theoretical value: 73.69% for C, 7.330% for H; measured value: 73.36% for C, 7.312% for H.

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Abstract

The invention discloses a titanium compound catalyst and a method for preparing the syndiotactic polystyrene. The titanium compound catalyst consists of the titanium compound, the poly-alkyl aluminum and the triisobutyl aluminum and the general formula of the titanium compound is Cp<*>Ti(O-Ph-X)3; Cp<*> symbolizes the p-pentamenthyl-cyclopentadienyl and X symbolizes F, Cl, CH<3> and OCH<3>; the structural formula of the titanium compound is shown as the formula (I); the general formula of the poly-alkyl aluminum is -[-AlR-O-]n; wherein, R symbolizes the methyl and n ranges from 4 to 40 and is optimally selected from 15 to 30; The molar ratio of the titanium compound to the poly-alkyl aluminum to the triisobutyl aluminum ranges from 1 to 50 to 700 to 0 to 300 and the optimal selection molar ratio of the titanium compound to the poly-alkyl aluminum to the triisobutyl aluminum ranges from 1 to 300 to 700 to 100. The titanium compound catalyst of the invention has a very high catalytic activity and the syndiotactic polystyrene obtained by catalyzing the styrene body to be polymerized at a proper industry temperature has a higher syndiotacticity, a higer melting point and a higer molecualr weight.

Description

technical field [0001] The invention relates to the preparation technology of syndiotactic polystyrene. Background technique [0002] Syndiotactic polystyrene is a new type of engineering plastic with a series of characteristics such as high heat distortion temperature (245°C), high hardness, low density, high elastic modulus, low dielectric constant and excellent chemical corrosion resistance, and crystallization The speed is fast, and it is easy to process by various methods such as extrusion, injection, and molding. Therefore, syndiotactic polystyrene has a very broad application prospect. Almost all engineering plastics such as PET, PBT, PA, and PPS can use syndiotactic polystyrene. polystyrene. At present, it is mainly used in electronic and electrical components such as integrated circuits, plug-in boards, and module magnetic record carriers; automotive components such as wipers, air conditioners or igniters, ventilation hoods and bumpers; film materials such as magne...

Claims

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Application Information

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IPC IPC(8): C08F4/642C08F112/08
Inventor 张玲祝方明伍青肖姗姗高海洋林尚安
Owner SUN YAT SEN UNIV
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