Huang Kuan-Ying, Huang Yu-Zhe, Lee Li-Ting, Woo Eamor M
Department of Chemical Engineering, National Cheng Kung University, No. 1, University Road, Tainan 701-01, Taiwan.
Department of Materials Science and Engineering, Feng Chia University, Taichung 407-24, Taiwan.
Polymers (Basel). 2023 Jan 11;15(2):393. doi: 10.3390/polym15020393.
The exterior and interior lamellar assemblies of poly(p-dioxanone) (PPDO) crystallized at 76 °C yield the most regular ones to interpret the 3D assembly mechanisms and potential for structural coloration iridescence, which are investigated using atomic-force microscopy (AFM), and scanning electron microscopy (SEM). PPDO displays two types of ring-banded spherulites within a range of Tc with dual-type birefringent spherulites (positive and negative-type) only within a narrow range of Tcs = 70−78 °C. At Tc > 80 °C, the inter-band spacing decreases from a maximum and the crystal assembly becomes irregularly corrupted and loses the capacity for light interference. Periodic grating assemblies are probed by in-depth 3D dissection into periodically banded crystal aggregates of poly(p-dioxanone) (PPDO) to disclose such layered gratings possessing iridescence features similar to nature’s structural coloration. This work amply demonstrates that grating assembly by orderly stacked crystal layers is feasible not only for accounting for the periodic birefringent ring bands with polarized light but also the distinct iridescence by interfering with white light.
在76°C结晶的聚对二氧环己酮（PPDO）的外部和内部层状组装体产生了最规则的组装体，以解释三维组装机制和结构着色虹彩的潜力，使用原子力显微镜（AFM）和扫描电子显微镜（SEM）对其进行了研究。PPDO在一定的结晶温度范围内显示出两种类型的环状球晶，而双型双折射球晶（正型和负型）仅在狭窄的结晶温度范围Tcs = 70−78°C内出现。在结晶温度Tc > 80°C时，带间距从最大值减小，晶体组装变得不规则破坏，并失去光干涉能力。通过对聚对二氧环己酮（PPDO）的周期性带状晶体聚集体进行深入的三维剖析，探测周期性光栅组装体，以揭示这种具有类似于自然结构着色虹彩特征的分层光栅。这项工作充分证明，通过有序堆叠的晶体层进行光栅组装不仅对于解释偏振光下的周期性双折射环带是可行的，而且对于通过干涉白光产生独特的虹彩也是可行的。
