Triphasic Polymer Particles Assembled via Microphase Separation with Multiple Functions
Triphasic Polymer Particles Assembled via Microphase Separation with Multiple Functions
复制标题
多功能微相分离组装三相聚合物颗粒
DOI：
10.1021/acs.langmuir.1c01769
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Wang Xiaogong
中科院分区：
文献类型：
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作者：
Liao Chuyi;Wang Xiaogong
这项工作研究了由偶氮聚合物（PCNAZO）、荧光含芘聚合物[P（MMA-co-PyMA）]和聚（二甲基硅氧烷）基聚合物（H2pdca-PDMS）组成的独特三相胶体颗粒，重点关注其合成、形成机制、形貌控制和功能。通过有机溶剂的逐渐蒸发，在水介质中二氯甲烷（DCM）液滴中的组分进行微相分离，从而组装出具有明确形态的三相颗粒。芘基部分的实时荧光发射光谱和原位显微镜观察表明，三相颗粒的形成经历了富含PCNAZO相的分离、富含P(MMA-co-PyMA)相和富含H2pdca-PDMS相之间的分离、聚结和在分散液滴中的凝固。根据弗洛里-哈金斯理论的计算表明，结构的形成是由于聚合物的强烈相分离。发现颗粒的形态和相界是由相之间的界面能和加工条件控制的。由此获得的三相颗粒具有一系列源自聚合物和三室结构的有趣功能。沉积在基材上后，H2pdca-PDMS 部件可以紧密粘附在表面上，这是由于 DCM 轻微溶胀时聚合物的铺展性质造成的。当用 488 nm 的线偏振激光束照射时，偶氮聚合物隔室沿着偏振光的电振动方向表现出显着的伸长，同时伴随着 H2pdca-PDMS 垫的协同变形。当分散在水中并粘附在基材表面上时，三相颗粒表现出源自芘基荧光团的荧光和偶氮发色团的光吸收的可调颜色。这里开发的实时研究方法可以加深对有限体积内结构形成过程的理解，也可以应用于其他聚合物的相分离研究。
This work investigated a unique type of triphasic colloidal particles composed of an azo polymer (PCNAZO), a fluorescent pyrene-containing polymer [P(MMA-co-PyMA)], and a poly(dimethylsiloxane)-based polymer (H2pdca-PDMS), focusing on the synthesis, forming mechanism, morphology control, and functions. The triphasic particles with well-defined morphologies were assembled through the microphase separation of the components in dichloromethane (DCM) droplets in an aqueous medium, induced by the gradual evaporation of the organic solvent. The real-time fluorescence emission spectra of the pyrenyl moieties andin situmicroscopic observations show that the formation of the triphasic particles undergoes the segregation of the PCNAZO-rich phase, separation between P(MMA-co-PyMA)-rich and H2pdca-PDMS-rich phases, coalescence, and solidification in the dispersed droplets. The structure formation is due to the strong phase separation of the polymers as revealed by the calculations based on the Flory–Huggins theory. The morphologies and phase boundaries of the particles are found to be controlled by the interfacial energy between the phases and processing conditions. The triphasic particles thus obtained possess a series of interesting functions stemming from the polymers and the triple-compartmentalized structures. After being deposited on a substrate, the H2pdca-PDMS parts can tightly adhere on the surface, caused by the spreading nature of the polymer when slightly swelled by DCM. Upon irradiation with a linearly polarized laser beam at 488 nm, the azo polymer compartments show a significant elongation along the electric vibration direction of the polarized light, accompanied by the cooperative deformation of the H2pdca-PDMS pads. When dispersed in water and adhered on the substrate surface, the triphasic particles exhibit tunable colors originating from the fluorescence of the pyrenyl fluorophores and light absorption of the azo chromophores. The real-time investigation methods developed here could lead to the deep understanding of the structure formation process in the confined volume and be applied in phase-separation study of other polymers as well.