???Si(R???)2???R??? where p is an integer ranging from 2???10 and R??? is a small alkyl group; R1 is a group having the formula: ???(CH2)p???si(CH3)2???O???Si(CH3)3 where p is an integer ranging from 2???10; R1 is a group having the formula: ???(CH2)p???Si(CH3)2???O???Si(CH3)3 where p is 3???6; or R1 is a group having the formula: ???(CH2)5???Si(CH3)2???O???Si(CH3)3.