Copolymer, method of making the same, rubber composition and pneumatic tyre

A technology of polymers and copolymers, applied in the field of copolymers

Inactive Publication Date: 2013-06-26
THE GOODYEAR TIRE & RUBBER CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Such macroscopic phase separation is likely to have detrimental effects on composite properties

Method used

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  • Copolymer, method of making the same, rubber composition and pneumatic tyre
  • Copolymer, method of making the same, rubber composition and pneumatic tyre
  • Copolymer, method of making the same, rubber composition and pneumatic tyre

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0118] In this example, the functionalization of styrene-butadiene rubber with 2-mercaptonaphthalene is illustrated to demonstrate the thiol-ene reaction.

[0119] To test the reactivity and reaction conditions of styrene-butadiene rubber in thiol-ene reactions, some reactions were performed with model thiols. The thiol of choice was 2-mercaptonaphthalene, available from Aldrich.

[0120] The properties of the styrene-butadiene rubber used are summarized in Table 1. Figure 1 shows the elastomeric 1 H-NMR spectrum.

[0121] Table 1

[0122] Mooney (average) 27.6 finish mooney 23.1 Tg(start) / ℃ -21.74 Tg(midpoint) / ℃ -17.52 FTIR styrene / % 25.392 FTIR Vinyl / % 47.506 FTIR cis / % 13.144 FTIR trans / % 13.058 Mn / g / mol 124122 Mw / g / mol 207982 Mz / g / mol 327454 PDI 1.67

[0123] Synthesis of 2-mercaptonaphthalene functionalized rubber

[0124] This compound was synthesized twice, once with AIBN as the init...

Embodiment 2

[0131] In this example the preparation of poly(N-isopropylacrylamide) or PNIPAM is illustrated.

[0132] Preparation of PNIPAM using RAFT polymerization. For this purpose, two alternative chain transfer agents (CTAs) were prepared: S-1-dodecyl-S-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate (DMP ) and 4-cyano-4-dodecylthiocarbonylthio-4-methylbutanoic acid (CDSMB).

[0133]

[0134] The RAFT reaction scheme is as follows:

[0135]

[0136] Synthesis of Chain Transfer Agents

[0137] S-1-dodecyl-S-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate (DMP)

[0138] S-1-dodecyl-S-(α,α'-dimethyl-α"-acetic acid) trithiocarbonate was synthesized using literature procedures [J. T. Lai, D. Filla, R. Shea, Macromolecules 2002, 35, 6754.]

[0139] Yield: 41%

[0140] 1 H-NMR (CDCl 3 / 300 MHz):δ[ppm]:0,85 (t, 3H), 1,16-1,47 (m, 20H), 1,71 (s, 6H), 3,26 (t, 2H), 13,05 (s, 1H)

[0141] 4-cyano-4-dodecylthiocarbonylthio-4-methylbutanoic acid (CDSMB)

[0142] 4-Cyano-4-...

Embodiment 3

[0162] In this example the functionalization of styrene-butadiene rubber with PNIPAM is illustrated.

[0163] Synthesis of Functionalized Rubber Elastomers

[0164] Functionalized elastomers were fabricated with the following general procedure: A solution of SBR, AIBN, and thiol in anhydrous THF was degassed under an argon atmosphere at room temperature for 2 hours. The exact amounts of educts for each reaction are shown in Table 4. The reaction mixture was then placed in a preheated oil bath at 70°C for at least 20 hours. To ensure that there were no free thiols in the reaction product, the product was dialyzed against THF for three days. After dialysis, the solvent was evaporated and the product was dried under vacuum. The results of the elemental analysis of the three functionalized elastomers are shown in Table 5 together with the calculated weight percent of PNIPAM in the resulting functionalized SBR.

[0165] SBR (1) and functionalized rubber (2) 1 The H-NMR spect...

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PUM

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Abstract

The present invention relates to a copolymer comprising a polymeric backbone chain derived from a monomer comprising at least one conjugated diene monomer and optionally at least one vinyl aromatic monomer such as styrene, and polymeric sidechains bonded to the backbone chain, the sidechains comprising a polymer capable of exhibiting a lower critical solution temperature. The present invention also relates to a method of making the copolymer, a rubber composition comprising the same and a pneumatic tyre.

Description

Invention background [0001] The aqueous solution of a variety of polar intangible sub -polymers shows a lower critical solution temperature (LCST).When heating these solutions is higher than LCST, compared with the hydrogen bonds of water molecules, hydrogen bonds in the molecule are preferred.This causes polymer rolls to fold and precipitate the polymer from the solution.This phase transition is reversible, so when the temperature is lower than the LCST, the polymer is dissolved again.The familiar instance of the LCST polymer is polymer (N-isopropyl acrylamide) (PNIPAM).The water solution of this polymer is shown in the LCST of about 33 ° C. [0002] The combination of LCST polymer and elastic body provides the possibility of better controlling elastic body performance in a variety of applications exposed to water.The simple mix of LCST polymer and elastic body obtains a complex that is separated from macro phase due to the lack of covalent bonds between LCST polymer and elastic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F299/00C08L51/04C08K3/04C08K3/36B60C1/00
CPCB60C1/0016C08C19/20C08F2/38C08F220/56C08F299/00C08F2438/03
Inventor R.穆鲁克F.施米茨R.F.罗斯坎普A.赫曼恩R.W.曾特
Owner THE GOODYEAR TIRE & RUBBER CO
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