Abstract: A lubrication board includes a substrate; and a lubrication layer disposed on a surface of the substrate, wherein the lubrication layer comprises a polymer expressed by formula (I) below, formula (I); wherein R1 is selected from a substituted or unsubstituted C6-C18 alkyl; R2 is selected from a substituted or unsubstituted C2-C18 alkyl or C2-C18 alkyl which is interrupted by —O—; R3 is selected from —NH— or —S—; R4 is selected from —NH2, —OH or —SH; and n, p and q are positive integers ranging from 2 to 20000.

Abstract: A lubrication board includes a substrate; and a lubrication layer disposed on a surface of the substrate, wherein the lubrication layer comprises a polymer expressed by formula (I) below, formula (I); wherein R1 is selected from a substituted or unsubstituted C2-C18 alkyl or C2-C18 aryl; R2 is selected from a substituted or unsubstituted C2-C18 alkyl or C2-C18 alkyl which is interrupted by —O—; R3 is selected from —NH— or —S—; R4 is selected from —NH2, —OH or —SH; and n, p and q are positive integers ranging from 2 to 20000.

Abstract: A lubrication board includes a substrate; and a lubrication layer disposed on a surface of the substrate, wherein the lubrication layer comprises a polymer expressed by formula (I) below, wherein R1 is selected from a substituted or unsubstituted C6-C18 alkyl; R2 is selected from a substituted or unsubstituted C2-C18 alkyl or C2-C18 alkyl which is interrupted by —O—; R3 is selected from —NH— or —S—; R4 is selected from —NH2, —OH or —SH; and n, p and q are positive integers ranging from 2 to 20000.

Abstract: A lubrication board includes a substrate; and a lubrication layer disposed on a surface of the substrate, wherein the lubrication layer comprises a polymer expressed by formula (I) below, wherein R1 is selected from a substituted or unsubstituted C2-C18 alkyl or C2-C18 aryl; R2 is selected from a substituted or unsubstituted C2-C18 alkyl or C2-C18 alkyl which is interrupted by —O—; R3 is selected from —NH— or —S—; R4 is selected from —NH2, —OH or —SH; and n, p and q are positive integers ranging from 2 to 20000.

Abstract: A combination paper top includes a first paperboard and a second paperboard. One of the first and second paperboards is precut with a separable top top board, a separable top bottom board and a separable top sideboard. Printed layers are laid on surfaces of the first and second paperboards. The printed layers are printed with various colorful figures or words to combine education with recreation. After separated from the first and second paperboards, the top top board, the top bottom board and the top sideboard can be DIY assembled to form a hollow top main body. A support pin is inserted through the centers of the top top board and the top bottom board. A first end of the support pin serves as a spinning section, while a second end of the support pin serves as a tip of the top. The combination paper top also serves as a decoration.