Functional disulfide vegetable oils, method of making and use in rubber compositions and tires

A vegetable oil derivative comprising the structure

• where R1, R2, and R3 are independently C15-C20 alkenyl, C15-C20 alkyl, and optionally containing aromatic groups;
• R is —S—S—R4 or R is —S—X—S—S—R4 where X is an unsubstituted alkane diyl;
• R4 is a monovalent organic group selected from the following structures:
• where Z is a group that helps control the reactivity of the thiocarbonylthio moiety;
• where X is selected from a group consisting of methylene units;
• R6, R7 can be independently hydrogen, alkyl chains, or aromatic moieties;
• where R8, R9 can be independently alkyl or aromatic functionalities;
• R10—
• where R10 is a non-substituted aromatic heterocycle;
• where X is selected from a group consisting of methylene units;
• R11, R12 can be symmetric or asymmetric and independently be an alkyl, aromatic, or ethereal substituents;
• where X is selected from a group consisting of methylene units;
• R13, R14 can be symmetric or asymmetric and are independently hydrogen, an alkyl chain, aromatic containing functional group;
• and
• where R15, R16 can be independently hydrogen, alkyl chains, or aromatic moieties;
• each R is covalently bonded to a carbon atom of one of R1, R2, or R3;
• and m is the number of R groups and is greater than (>) 1.