Polysiloxane material and polysiloxane composition comprising the same

A polysiloxane material (I), which is

• a polysiloxane (Pab) comprising a repeating unit represented by the formula (ia) and a repeating unit represented by the formula (ib), or
• a mixture of a polysiloxane (Pa) comprising the repeating unit represented by the formula (ia) and a polysiloxane (Pb) comprising the repeating unit represented by the formula (ib):
• where
• L1 is C4-12 linear alkylene;
• one or more H in L1 can be replaced with C1-10 linear alkyl, C3-10 branched alkyl, C3-15 alkyl containing an alicyclic ring, C6-15 aryl, —COOH or —OH;
• one or more non-adjacent methylene (—CH2—) in L1 can be replaced with -Ph-, —O—, —S—, —CO—, —CO—O—, —O—CO—, —O—CO—O—, —CR1═CR2— or —C≡C—;
• and
• R1 and R2 are each independently H or C1-6 linear alkyl.