Cyclic‐poly(phthalaldehyde) (cPPHA) exhibits photo‐triggerable depolymerization on‐demand for applications like the photolithography of microfabricated electronics. However, cPPHA is inherently brittle and thermally sensitive; both of these properties limit its usefulness as an engineering plastic. Prior to this report, small molecule plasticizers are added to cPPHA‐based films to make the polymer more flexible. But plasticizers can eventually leach out of cPPHA, then leaving it increasingly more brittle throughout product lifetime. In this research, a new approach to fabricating flexible cPPHA blends for use as spun fibers is achieved through the incorporation of poly (ε‐caprolactone) (PCL) by a modified wet spinning method. Among blend compositions, the 50/50 cPPHA/PCL fiber shows fast transience (<50 s) in response to daylight while retaining the flexibility of PCL and mechanical properties of an elastomer (i.e., tensile strength of ≈8 MPa, Young's modulus of ≈118 MPa, and elongation at break of ≈190%). Embedding 2 wt% gold nanoparticles to cPPHA can further improve the transience rate of fibers comprising less than 50% cPPHA. These flexible, daylight‐triggerable cPPHA/PCL fibers can be applied to an extensive range of applications, such as wearable electronics, intelligent textiles, and zero waste packaging for which modest mechanical performance and fast transience are desired.

中文翻译：

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具有快速日光触发瞬态的柔性环-聚（苯二甲醛）/聚（ε-己内酯）混纺纤维

环-聚（苯二甲醛）（cPPHA）按需显示可光触发解聚，适用于微电子产品的光刻。但是，cPPHA本质上是脆性的并且对热敏感。这两个特性都限制了其作为工程塑料的用途。在此报告之前，在基于cPPHA的薄膜中添加了小分子增塑剂，以使聚合物更具柔韧性。但是增塑剂最终可能会从cPPHA中浸出，然后使其在整个产品生命周期中变得越来越脆。在这项研究中，通过改进的湿法纺丝掺入聚（ε-己内酯）（PCL），实现了一种新的制造柔性cPPHA混纺纤维的方法。在共混物组合物中，50/50 cPPHA / PCL纤维显示出快速瞬变（< 50 s）响应日光，同时保留PCL的柔韧性和弹性体的机械性能（即抗张强度≈8MPa，杨氏模量≈118MPa，断裂伸长率≈190％）。将2 wt％的金纳米粒子嵌入cPPHA可以进一步提高包含少于50％cPPHA的纤维的瞬态率。这些柔软的，可在日光下触发的cPPHA / PCL纤维可广泛应用于需要适度机械性能和快速瞬态的应用，例如可穿戴电子产品，智能纺织品和零废物包装。将2 wt％的金纳米粒子嵌入cPPHA可以进一步提高包含少于50％cPPHA的纤维的瞬态率。这些柔软的，可在日光下触发的cPPHA / PCL纤维可广泛应用于需要适度机械性能和快速瞬态的应用，例如可穿戴电子产品，智能纺织品和零废物包装。将2 wt％的金纳米粒子嵌入cPPHA可以进一步提高包含少于50％cPPHA的纤维的瞬态率。这些柔软的，可在日光下触发的cPPHA / PCL纤维可广泛应用于需要适度机械性能和快速瞬态的应用，例如可穿戴电子产品，智能纺织品和零废物包装。