The present application discloses a method for preparing polyester polyol comprising performing transesterification of raw materials containing inorganic oxyacid ester and polyhydric alcohol to obtain the polyester polyol. The polyester polyol obtained by the method described in the present application has higher heat resistance.

The present application discloses a method for preparing polyester polyol comprising performing transesterification of raw materials containing inorganic oxyacid ester and polyhydric alcohol to obtain the polyester polyol. The polyester polyol obtained by the method described in the present application has higher heat resistance.

The present disclosure relates to a composition that includes a first copolymer having a first repeat unit and a second repeat unit as defined by Structure (I)

##STR00001##

where is a covalent bond, U.sub.1 is a molar fraction of the first repeat unit, (1?U.sub.1) is a molar fraction of the second repeat unit, 0?n?20, 0?m?20, 0<U.sub.1?1.0, R is a linking group covalently linking the first copolymer to a second copolymer by the covalent bond, and R includes carbon, hydrogen, and sulfur.

The present disclosure relates to a composition that includes a first copolymer having a first repeat unit and a second repeat unit as defined by Structure (I)

##STR00001##

where is a covalent bond, U.sub.1 is a molar fraction of the first repeat unit, (1?U.sub.1) is a molar fraction of the second repeat unit, 0?n?20, 0?m?20, 0<U.sub.1?1.0, R is a linking group covalently linking the first copolymer to a second copolymer by the covalent bond, and R includes carbon, hydrogen, and sulfur.

The present application discloses a method for preparing polyester polyol comprising performing transesterification of raw materials containing inorganic oxyacid ester and polyhydric alcohol to obtain the polyester polyol. The polyester polyol obtained by the method described in the present application has higher heat resistance.

The present application discloses a method for preparing polyester polyol comprising performing transesterification of raw materials containing inorganic oxyacid ester and polyhydric alcohol to obtain the polyester polyol. The polyester polyol obtained by the method described in the present application has higher heat resistance.