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Water-based process for the preparation of polymer-clay nanocomposites

A technology of nanocomposite materials and copolymers, applied in the direction of nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of not reaching the limit state of the dispersed phase

Inactive Publication Date: 2007-06-27
THE GOODYEAR TIRE & RUBBER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although intercalated polymer-clay domains are an improvement, they fall short of the limit state commonly referred to as exfoliated dispersed phase

Method used

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  • Water-based process for the preparation of polymer-clay nanocomposites
  • Water-based process for the preparation of polymer-clay nanocomposites

Examples

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[0021] It will be appreciated that the preparation of elastomer / clay nanocomposites has been disclosed in WO 2004 / 078785 and WO 2004 / 078839. There is no disclosure or suggestion that cationically charged water-soluble polyelectrolytes prepared from CFRP / RAFT can be used as macroinitiators for the synthesis of amphiphilic block copolymer latexes containing one or more cationic charged block and at least one non-polar block. Furthermore, neither patent suggests or demonstrates that such "surfactant-free" core-shell amphiphilic elastomer latexes can be used directly with dispersed ion-exchangeable clays for the rapid and efficient preparation of Polymer-clay nanocomposites.

[0022] It is important to understand that an important aspect of the present invention is the channeling between the layers of an amphiphilic block copolymer latex containing one or more cationically charged blocks and at least one nonpolar block. Multilayer water-swellable clays (such as smectite-type cla...

Embodiment 1

[0146] Preparation of poly(4-vinylpyridine) with diphenylmethyltrithiocarbonate (DBTTC) RAFT reagent via an "in situ" emulsification method

[0147] 1.33 g (~0.00459 moles) of benzhydryl trithiocarbonate, 60.0 g (~0.57 moles) of distilled 4-vinylpyridine and 3.6 g (~0.0127 moles) of oleic acid were added to a machine equipped with a mechanical paddle Stirrer, nitrogen inlet, enclosed thermometer, heating mantle and condenser in a 500ml three necked round bottom flask. The stirred reactor was then purged with a slow stream of nitrogen before adding 0.36 g (~0.00133 moles) of potassium persulfate, 0.88 g (~0.0083 moles) of sodium carbonate, 0.88 g of (-0.010 mol) sodium bicarbonate and 0.82 g (-0.0126 mol) potassium hydroxide in water. A yellow emulsion formed immediately. The emulsion was then rapidly heated to 65°C and maintained at this temperature with the aid of a heat gauge controller. The progress of the polymerization was then gravimetrically analyzed. After one hour...

Embodiment 2

[0149] Preparation of poly(4-vinylpyridine) with S-benzyl-S'-(2-hydroxydecyl)trithiocarbonate (BHDTTC) RAFT reagent by an "in situ" emulsification method

[0150] Procedure: Same as Example 1 except 1.80 g (-0.00464 moles) of BHDTTCRAFT reagent was used instead of DBTTC. After a reaction time of 4 hours at 65° C., the reaction was worked up in the same manner as in Example 1. A solution of 19.66% solids in 289 g of methanol represented 56.8 g of poly(4-vinylpyridine) or 92% conversion.

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Abstract

The invention relates to a water base method of making use of block polymer of latex form to prepare interposed layer and / or removed natural or composited clay. The block polymer contains at least a non-polar block and one or more cation block, inwhich the block polymer is prepared by the method of controlled latex free radical polymerization.

Description

technical field [0001] The present invention relates to a method for preparing nanocomposites, and more particularly to a water-based method for preparing polymer-clay nanocomposites. Background technique [0002] Adding fillers to polymers is a common industrial practice. The purpose is generally two-fold: to reduce the overall cost of the composite while bringing improvements in mechanical properties such as wear, hardness, tensile modulus, tear, etc. It is also known that by using extremely small size (<200nm) filler particles, polymer composite properties can be improved with much lower filler concentrations, typically 2 to 10 parts by weight per 100 parts by weight rubber, compared to Usually micron-sized filler particles are used, 30 to 100 parts by weight per 100 parts by weight of rubber. Nano or "nanoscale" fillers have extremely high surface areas and have high surface energies. Therefore, it is important to overcome or consume this surface energy in some way...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F297/00C08F2/44C08F2/24C08F26/06C08L53/00C08K13/04
CPCC08K5/548C08L21/00C08L53/02C08F2/38C08J5/005C08K2201/011C08F293/005C08K3/0033C08J2353/00B82Y30/00C08F2438/03C08L53/00C08K3/013C08L2666/24C08L2666/02C08L2666/04
Inventor D·K·帕克X·杨
Owner THE GOODYEAR TIRE & RUBBER CO
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