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Provided is a polymer nanoparticle comprising a core and a vulcanizable shell, wherein the core has a glass transition temperature (Tg) of at least about 150° C. Also provided is a method of preparing polymer nanoparticles with a core and a vulcanizable shell, comprising (a) in a liquid hydrocarbon

Provided is a polymer nanoparticle comprising a core and a vulcanizable shell, wherein the core has a glass transition temperature (Tg) of at least about 150° C. Also provided is a method of preparing polymer nanoparticles with a core and a vulcanizable shell, comprising (a) in a liquid hydrocarbon medium, polymerizing conjugated diene monomers to produce a poly(conjugated diene) block and (b) copolymerizing the poly(conjugated diene) block with a mixture of mono-vinyl aromatic monomers and multiple-vinyl aromatic monomers to produce an aromatic block, wherein the core has a Tg of at least about 150° C. Also provided is a composition comprising (a) a rubber matrix; and (b) a polymer nanoparticle including a core and a vulcanizable shell; wherein the Tg of the core is at least about 150° C.

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1. A polymer nanoparticle comprising a core and a vulcanizable shell, wherein the core has a glass transition temperature (Tg) between about 150° C. and about 600° C. and comprises a copolymer of mono-vinyl aromatic monomer and multiple-vinyl aromatic monomer; wherein the nanoparticle comprises cros

1. A polymer nanoparticle comprising a core and a vulcanizable shell, wherein the core has a glass transition temperature (Tg) between about 150° C. and about 600° C. and comprises a copolymer of mono-vinyl aromatic monomer and multiple-vinyl aromatic monomer; wherein the nanoparticle comprises cross-linked micelle structures; wherein the nanoparticle is formed by hydrocarbon solution polymerization. 2. The polymer nanoparticle of claim 1, wherein the core has a Tg between about 200° C. and about 400° C. 3. The polymer nanoparticle of claim 1, wherein the core has a Tg between about 250° C. and about 300° C. 4. The polymer nanoparticle of claim 1, wherein the vulcanizable shell is sulfur or peroxide curable. 5. The polymer nanoparticle of claim 1, wherein the vulcanizable shell comprises poly(conjugated diene) blocks. 6. The polymer nanoparticle of claim 1, wherein the vulcanizable shell comprises conjugated diene units and mono-vinyl aromatic units. 7. The polymer nanoparticle of claim 5, wherein the mono-vinyl aromatic monomer is selected from the group consisting of styrene, ethylvinylbenzene, a-methyl-styrene, 1-vinyl naphthalene, 2-vinyl naphthalene, vinyl toluene, methoxystyrene, t-butoxystyrene; as well as alkyl, cycloalkyl, aryl, alkaryl, and aralkyl derivatives thereof; and mixtures thereof. 8. The polymer nanoparticle of claim 5, wherein the multiple-vinyl aromatic monomer has a general formula as shown below: in which p is an integer and 2