Higher order star polymers having multiple polyisobutylene arms radiating from a condensed core of siloxanes and a method for the synthesis thereof

A method for synthesizing a star polymer containing a core of at least two condensed siloxanes and a plurality of polyisobutylene arms emanating from said core, the method comprising:

• linking, by hydrosilation, olefin-terminated polyisobutylene prearms to at least one of said siloxanes;
• and
• coupling said siloxanes to form the core by providing an effective amount of water to produce at least one Si--OH group within at least one of said siloxanes and reacting said at least one Si--OH group with one of an Si--H group or another Si--OH group of at least one other siloxane.

A method for synthesizing a star polymer containing a core of at least two condensed siloxanes and a plurality of polyisobutylene arms emanating from said core, the method comprising:

• linking, by hydrosilation, olefin-terminated polyisobutylene prearms to at least one of said siloxanes, said at least one siloxane having at least two Si--H groups prior to hydrosilation and at least one Si--H group after hydrosilation;
• and
• coupling said siloxanes to form a core by providing an effective amount of water to convert a fraction of the Si--H groups of said siloxanes to Si--OH groups and reacting said Si--OH groups with one of said Si--H groups or said Si--OH groups of at least one other siloxane.