In this work, the photo-actuation of melt-processed ultra-drawn films based on high-density polyethylene (HDPE), incorporating a light-responsive additive (2-(2H-benzotriazol-2-yl)-4,6-ditertpentylphenol, BZT), is presented. These oriented films exhibits a fast (<1 s) and reversible photo-thermal response upon exposure to ultra-violet (UV) light with a maximum actuation stress of ∼20 MPa at a strain of 0.1%. Actuation is triggered by light, which is absorbed by the BZT and transferred into heat. The generated heat, in combination with the intrinsic high stiffness (∼30 GPa) and negative thermal expansion of these oriented polymer films, induces entropy driven contraction of the macromolecular chains and thus when constrained an actuation stress. The above described set of properties, in combination with the facile, low cost and industrially scalable processing of these actuators makes them suitable for a wide range of potential applications, such as light driven robotics, control devices and functional textiles.

在这项工作中，基于高密度聚乙烯（HDPE）的熔融处理超拉伸薄膜的光致动，并掺入了光响应性添加剂（2-（2H-苯并三唑-2-基）-4,6-二叔戊基苯酚，BZT）。这些取向的薄膜在暴露于紫外线（UV）时表现出快速（<1 s）且可逆的光热响应，在0.1％应变下的最大驱动应力约为20 MPa。BZT吸收光并将其转化为热量，从而触发光。所产生的热量，加上固有的高刚度（约30 GPa）和这些定向聚合物薄膜的负热膨胀，会引起大分子链的熵驱动收缩，因此会限制驱动应力。以上所述的属性集，结合了便利性，