Controllable extension of flexible oligomeric diols and methods thereof

An extended diol composition, comprising:

• a first component comprising a diol oligomer;
• a second component comprising a bisdimethylamino silane species;
• and wherein:
• the first component is in molar excess to the second component;
• the diol oligomer has a number average molecular weight Mn of from about 500 g/mol to about 5,000 g/mol;
• the extended diol composition has a number average molecular weight Mn greater than 5,000 g/mol;
• and
• the bisdimethylamino silane species comprises:
• and
• an R1 and R2 are selected from CH3, vinyl, phenyl.

A method for making an extended diol composition, comprising:

• providing a diol oligomer to a reaction vessel, the diol oligomer comprising an average molecular weight of from about 500 to about 5,000 g/mol;
• heating the diol oligomer in an inert atmosphere at a temperature of from about 50 to about 110° C.;
• and
• adding a bisdimethylamino silane compound while stirring.