Multicompartment Microparticles with Patchy Topography through Solvent-Adsorption Annealing,ACS Macro Letters

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Multicompartment Microparticles with Patchy Topography through Solvent-Adsorption Annealing
ACS Macro Letters ( IF 5.1 ) Pub Date : 2019-12-05 , DOI: 10.1021/acsmacrolett.9b00713
Xiaolian Qiang ₁ , Xuezhi Dai ₁ , Andrea Steinhaus ₁ , André H Gröschel ₁

Affiliation

We report on the evaporation-induced confinement assembly (EICA) of polystyrene-b-polybutadiene-b-poly(methyl methacrylate) (PS-b-PB-b-PMMA, SBM) triblock terpolymers into multicompartment microparticles and follow their morphological evolution during solvent-adsorption annealing. We initially obtain elliptic microparticles with axially stacked PS/PB/PMMA morphology using cetyltrimethylammonium bromide (CTAB) as surfactant. Exchanging the surfactant to poly(vinyl alcohol) (PVA) during solvent vapor annealing with chloroform (CHCl₃), PMMA preferentially interacts with the interface, and microparticles change their shape into spheres with concentric morphology. Surprisingly, this transformation initiates at both poles of the microparticles simultaneously and then proceeds toward the equator, resulting in particles with inner morphology and patchy topography. We observed this evolution for different PB fractions, suggesting the mechanism to be more general and the EICA process to be a suitable method to generate patchy particle surfaces.

中文翻译：

通过溶剂吸附退火获得具有斑块形貌的多室微粒

我们报告了聚苯乙烯-b-聚丁二烯-b-聚（甲基丙烯酸甲酯）（PS- b - PB - b - PMMA，SBM）三嵌段三元共聚物形成多室微粒的蒸发诱导限制组装（EICA），并在过程中跟踪它们的形态演变。溶剂吸附退火。我们最初使用十六烷基三甲基溴化铵 (CTAB) 作为表面活性剂获得了具有轴向堆叠 PS/PB/PMMA 形态的椭圆形微粒。在用氯仿 (CHCl ₃），PMMA优先与界面相互作用，微粒将其形状变为具有同心形态的球体。令人惊讶的是，这种转变同时在微粒的两个极点开始，然后向赤道前进，从而产生具有内部形态和斑块形貌的粒子。我们观察到不同 PB 分数的这种演变，表明该机制更普遍，并且 EICA 过程是生成斑块状颗粒表面的合适方法。

更新日期：2019-12-05

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