42), (44) Therefore, urethane is highly polar in relation to dimethylsiloxane
because of the former's higher cohesive energy density.
Other groups such as trimethylsilyl (HMDS) and dimethylsiloxane
(PDMS) can also be applied to replace hydroxyl groups.
2]/g; (*3)--copolymer of dimethylsiloxane
(50 mol %) and methylhydrogensiloxane (50 mol %) having both molecular terminals capped trimethylsiloxy groups, (*4)--3.
Since the silicone resin is composed of dimethylsiloxane
units and methylphenylsiloxane units, it is flexible and has low surface free energy.