A copolymer comprising (i) a plurality of ethylenic moieties A having a structure according to the following formula:
wherein R2 and R3 independently represent hydrogen, a halogen or an optionally substituted linear, branched or cyclic alk(en)yl group, or an optionally substituted aromatic or heteroaromatic, and (ii) a plurality of acetal moieties B having a structure according to the following formula:
wherein L1 represents a divalent linking group; x = 0 or 1 and R1 represents an optionally substituted aromatic or heteroaromatic group including at least one hydroxyl group, and (iii) a plurality of acetal moieties C and/or moieties D which include a structural moiety comprising a chromophoric group having its main absorption in the infrared region.
一种共聚物,包含(i)多个具有下式结构的
乙烯基分子 A:
其中 R2 和 R3 独立地代表氢、卤素或任选取代的直链、支链或环状烷(烯)基,或任选取代的芳香族或杂芳族,以及 (ii) 具有下式结构的多个
缩醛分子 B:
其中 L1 代表二价连接基团;x = 0 或 1,R1 代表任选取代的芳香族或杂芳香族基团,包括至少一个羟基,以及 (iii) 多个
缩醛分子 C 和/或分子 D,其中包括一个结构分子,该结构分子包含一个发色基团,该发色基团在红外区域有主要吸收。