A copolymer includes (i) a plurality of ethylenic moieties A having a structure according to the formula:
wherein R2 and R3 independently represent hydrogen, a halogen, an optionally substituted linear, branched, or cyclic alk(en)yl group, or an optionally substituted aromatic or heteroaromatic; (ii) a plurality of acetal moieties B having a structure according to the 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 including a chromophoric group having its main absorption in the infrared region.
一种共聚物包括(i)多个具有如下结构的
乙烯基分子 A:
其中 R2 和 R3 独立地代表氢、卤素、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香族;(ii) 具有如下结构的多个
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族基团,包括至少一个羟基;以及 (iii) 多个
缩醛基团 C 和/或基团 D,其中包括一个结构基团,该结构基团包括一个主吸收位于红外区域的发色基团。