Polyolefin grafted polydiene polymers, and methods of making and using same
Embodiments of the present disclosure are directed to polyolefin grafted polydiene polymers, wherein the polyolefin grafted polydiene polymers comprises a polydiene having a polydiene polymer backbone, a polyolefin, and at least one sulfur containing functionalizing agent which grafts the polyolefin onto at least one non-terminal position on the polydiene polymer backbone.
1. A polyolefin grafted polydiene polymer comprising:
a polydiene having a polydiene polymer backbone;
a polyolefin having an anhydride polymeric modifier; and
at least one sulfur containing functionalizing agent which grafts the polyolefin onto at least one non-terminal position on the polydiene polymer backbone.
2. The polyolefin grafted polydiene polymer of claim 1 , wherein the anhydride polymeric modifier comprises maleic anhydride.
3. The polyolefin grafted polydiene polymer of claim 1 , wherein the sulfur containing functionalizing agent comprises an aminothiol, the aminothiol having an amine moiety which reacts with the anhydride polymeric modifier.
4. The polyolefin grafted polydiene polymer of claim 1 , wherein the polyolefin comprises one or more C 2 -C 12 olefins.
5. The polyolefin grafted polydiene polymer of claim 1 , wherein the polydiene comprises 1,4-polybutadiene having a cis % of at least 85%.
6. A rubber composition comprising:
one or more rubbers selected from natural rubber and polydiene rubber;
reinforcing filler; and
the polyolefin grafted polydiene polymer of claim 1 .
7. The rubber composition of claim 6 , wherein a volume fraction of reinforcing filler plus polyolefin in the rubber composition is about 0.200 to about 0.350.
8. A method of producing a polyolefin grafted polydiene polymer comprising:
reacting a polyolefin having an anhydride polymeric modifier with at least one sulfur containing functionalizing agent to produce a functionalized polyolefin; and
producing the polyolefin grafted polydiene polymer by reacting the functionalized polyolefin with an unsaturated polydiene polymer.
9. The method of claim 8 , wherein the unsaturated polydiene polymer comprises 1,4-polybutadiene having a cis % of at least 85%.
10. The method of claim 8 , wherein the polymeric modifier reacts with the sulfur containing functionalizing agent.
11. The method of claim 8 , wherein the polymeric modifier is maleic anhydride, and the sulfur containing functionalizing agent includes thiols, polysulfides, or combinations thereof.
12. The method of claim 8 , wherein the functionalized polyolefin is grafted onto at least one non-terminal position on the unsaturated polydiene polymer.
13. The method of claim 8 , wherein the polyolefin is a copolymer, wherein the copolymer includes an ethylene monomer and at least one C 3 -C 12 olefin comonomer.