A Block Copolymer Templated Approach for the Preparation of Nanoporous Polymer Structures and Cellulose Fiber Hybrids by Ozone Treatment
A Block Copolymer Templated Approach for the Preparation of Nanoporous Polymer Structures and Cellulose Fiber Hybrids by Ozone Treatment
复制标题
通过臭氧处理制备纳米多孔聚合物结构和纤维素纤维杂化物的嵌段共聚物模板方法
DOI：
10.1039/d2py00562j
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发表时间：
2022
影响因子：
4.6
通讯作者：
M. Gallei
中科院分区：
文献类型：
--
作者：
L. Gemmer;B.J. Niebuur;T. Kraus;B.N.N. Balzer;M. Gallei
功能两亲嵌段共聚物（bcp）是一种多功能、智能和有前途的材料，经常被用作纳米科学中的软模板。bcp通常具有微相分离的能力，从而在纳米长度尺度上产生各种有趣的形态。bcp衍生的材料可以转化为多孔结构，同时保留基体材料的底层形态。本文介绍了一种制备多孔功能聚乙烯吡啶（P2VP）的简便、可扩展的方法。BCP聚异戊二烯嵌段p2vp （PI-b-P2VP）是通过各自单体的顺序阴离子聚合得到的，并用于形成散装状态的BCP膜或与纤维素纤维复合的软模板。bcp与1,4-二碘丁烷进行交联，随后使用臭氧选择性地降解材料内部的PI结构域，同时保留多孔和定制的P2VP纳米结构。各种聚合物表征方法，包括核磁共振（NMR），尺寸排除色谱（SEC）和差示扫描量热法（DSC），支持了本文提出的策略的可行性。通过扫描电子显微镜（SEM）、原子力显微镜（AFM）和小角度x射线散射（SAXS）对制备的体状和复合材料的形貌和孔隙形成进行了研究。此外，通过x射线能谱（EDS）、衰减全反射傅立叶变换红外光谱（ATR-FTIR）和水接触角（WCA）测量来检测化学转化。通过这种方便的策略，显示了在散装状态和可持续纤维素复合材料中制造功能多孔P2VP的方法，为产生新的刺激响应可持续材料家族铺平了合成策略。
Functional amphiphilic block copolymers (BCPs) are versatile, smart, and promising materials that are often used as soft templates in nanoscience. BCPs generally feature the capability of microphase-separation leading to various interesting morphologies at the nanometer length scale. Materials derived from BCPs can be converted into porous structures while retaining the underlying morphology of the matrix material. Here, a convenient and scalable approach for the fabrication of porous functional polyvinylpyridines (P2VP) is introduced. The BCP polyisoprene-block-P2VP (PI-b-P2VP) is obtained via sequential anionic polymerization of the respective monomers and used to form either BCP films in the bulk state or a soft template in a composite with cellulose fibers. Cross-linking of the BCPs with 1,4-diiodobutane is conducted and subsequently PI domains are selectively degraded inside the materials using ozone, while preserving the porous and tailor-made P2VP nanostructure. Insights into the feasibility of the herein presented strategy is supported by various polymer characterization methods comprising nuclear magnetic resonance (NMR), size exclusion chromatography (SEC), and differential scanning calorimetry (DSC). The resulting bulk- and composite materials are investigated regarding their morphology and pore formation by scanning electron microscopy (SEM), atomic force microscopy (AFM) and small-angle X-ray scattering (SAXS). Furthermore, chemical conversions were examined by energy dispersive X-ray spectroscopy (EDS), attenuated total reflection Fourier-transformation infrared spectroscopy (ATR-FTIR) and water contact angle (WCA) measurements. By this convenient strategy the fabrication of functional porous P2VP in the bulk state and also within sustainable cellulose composite materials is shown, paving the synthetic strategy for the generation of a new family of stimuli-responsive sustainable materials.