In good shape: The films of hyperbranchedpolycoumarate derivatives can undergo a reversible [2+2] cycloaddition under irradiation of UV light and behave like photomechanical elastomers. From a predetermined original shape A the photonically and thermally memorized shapes B and C were obtained. The original shape was recovered by photoirradiation (see picture; Tg=glass transition temperature).
形状良好:在紫外线的照射下,超支化聚香豆酸酯衍生物的薄膜可以发生可逆的[2 + 2]环加成反应,其行为类似于光机械弹性体。从预定的原始形状A获得光子和热存储的形状B和C。通过光辐照恢复原始形状(参见图片;T g =玻璃化转变温度)。