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A kind of atactic/stereoblock styrenic polymer and preparation method thereof

A styrenic, multi-block technology, applied in the field of styrenic polymers, can solve the problems of difficult adjustment of tacticity, high product brittleness, high tacticity, etc. Processability, effect of good heat resistance

Active Publication Date: 2011-11-30
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Therefore, the current styrene-based polymers still have the following deficiencies, the heat resistance of atactic polystyrene is not good, and the production cost of stereoregular polystyrene (such as syndiotactic polystyrene) is high, and stereoregular polystyrene It is difficult to adjust the degree of tacticity, too high tacticity makes processing difficult, and the product is too brittle

Method used

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  • A kind of atactic/stereoblock styrenic polymer and preparation method thereof
  • A kind of atactic/stereoblock styrenic polymer and preparation method thereof
  • A kind of atactic/stereoblock styrenic polymer and preparation method thereof

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Effect test

Embodiment 1

[0032] Under nitrogen protection, add 0.72mmol triisobutylaluminum and 2mmol tert-butyl chloroacetate to a 50mL catalyst preparation bottle and mix well, then add 0.04mmol 2-ethylhexanoic acid neodymium and mix well and age at 40°C for 3h to form a shallow Blue homogeneous transparent solution.

[0033] Adding styrene massfraction is 20ml of the cyclohexane solution of styrene of 26% to the polymerization bottle of 100ml drying under nitrogen protection, then adds above-mentioned catalyst solution (catalyst component A / monomer=1.0 * 10 -3 mol / mol), reacted at 40°C for 140h, added ethanol solution containing 5% hydrochloric acid by mass to terminate the reaction, washed with ethanol and dried in a vacuum oven at 50°C to constant weight to obtain 0.4g of polymer, GPC spectrum Figure presents unimodal molecular weight distribution, weight average molecular weight (M w )=1.1×10 6 g / mol, molecular weight distribution index (M w / M n ) = 1.7. The polymer sample has obvious crys...

Embodiment 2

[0035] Under nitrogen protection, add 0.75mmol triisobutylaluminum and 0.225mmol tert-butyl chloroacetate to a 50mL catalyst preparation bottle, mix them, then add 0.075mmol 2-ethylhexanoic acid neodymium and mix them, and age them at 40°C for 2h to form Light blue homogeneous transparent solution.

[0036] Styrene solution preparation mode is the same as embodiment 1, regulates styrene mass fraction to be 61%, in 20ml styrene solution, adds above-mentioned catalyst (catalyst component A / monomer=1.0 * 10 -3 mol / mol), react 72h under 60 ℃, all the other conditions are with embodiment 1, obtain polymer 0.8g, GPC spectrogram presents monomodal molecular weight distribution, weight average molecular weight (M w )=1.6×10 6 g / mol, molecular weight distribution index (M w / M n ) = 2.5. The polymer sample has obvious crystallization phenomenon, and there is a crystalline melting peak at 230 °C.

Embodiment 3

[0038] Before adding the catalyst to the monomer, add 3.75 mmol of trichloromethane as additive D to the styrene solution in the polymerization bottle under nitrogen protection and mix well. Catalyst preparation mode and all the other reaction conditions are with embodiment 2, obtain polymer 0.9g, GPC spectrogram presents monomodal molecular weight distribution, weight average molecular weight (M w )=1.1×10 6 g / mol, molecular weight distribution index (M w / M n ) = 2.8. The polymer sample has obvious crystallization phenomenon, and there are crystal melting peaks at 190 and 240 °C.

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Abstract

The invention relates to atactic multiblock styrene polymer and a preparation method thereof through coordination polymerization of a rare earth catalyst system. Under the condition of using the rare earth catalyst system, styrene monomers are polymerized to form the atactic multiblock styrene polymer by a one-kettle method by adding additives, controlling process conditions and the like, the heat resistance of the polymer is improved and the processability of materials is improved.

Description

Technical field: [0001] The invention relates to a random / stereo-block styrenic polymer and a preparation method thereof using a rare earth catalyst system to catalyze the coordination polymerization of styrene and its derivatives. Background technique: [0002] Styrene polymers are important polymer materials, which can be prepared by free radical polymerization, anionic polymerization, cationic polymerization and coordination polymerization of styrene and its derivative monomers. [0003] Polystyrene is the third largest plastic, and its performance and application fields are determined by molecular weight and stereoregularity. As the molecular weight of polystyrene increases, its tensile strength, bending strength and impact strength all increase (see Du Qiangguo et al., Plastic Industry Handbook-Polystyrene Resin, Beijing: Chemical Industry Press, 2004, 85-86); The heat resistance of polymers increases with the increase of molecular chain stereoregularity. Low-molecula...

Claims

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Application Information

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IPC IPC(8): C08F112/08C08F112/12C08F112/14C08F4/52C08F2/02C08F2/06
Inventor 吴一弦王和金朱寒
Owner BEIJING UNIV OF CHEM TECH
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