Epoxy and urethane compositions based on controllable extension of flexible oligomeric diols and methods thereof

An extended diol composition, comprising:

• a first component comprising an α,ω hydroxyl terminated diol oligomer having a number average molecular weight Mn of from about 500 Da to about 100,000 Da;
• a multifunctional isocyanate species;
• and
• a multifunctional species comprising an alcohol-functional group and an epoxy-functional group;
• and wherein:
• the α,ω hydroxyl terminated diol oligomer has a structure:
• R1 comprises a polyether, a polyester, or a polysiloxane;
• and
• R2 and R3 groups comprise methyl groups, ethyl groups, propyl groups, isopropyl groups, phenyl groups, or a combination thereof;
• and
• n is from about 1 to about 100.

A method of making a resin, comprising:

• providing a diol oligomer to a reaction vessel, the diol oligomer comprising an α,ω hydroxyl terminated diol oligomer having a number average molecular weight Mn of from about 500 Da to about 100,000 Da;
• adding a diisocyanate compound to the reaction vessel in a molar ratio of the diisocyanate compound to the α,ω hydroxyl terminated diol oligomer of about 1.1 to about 10;
• and
• heating the diol oligomer and the diisocyanate compound in an inert atmosphere at a temperature of from about 50 to about 110° C. for about 1 hour to about 2 hours;
• and wherein:
• the diol oligomer comprises [—O—Si(R2, R3)—O—];
• and
• the R2 and R3 groups may include methyl groups, ethyl groups, propyl groups, isopropyl groups, phenyl groups, or a combination thereof.