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工艺条件对通过乳液凝胶法制备的间苯二酚-甲醛气凝胶微粒性能的影响

Effect of Process Conditions on the Properties of Resorcinol-Formaldehyde Aerogel Microparticles Produced via Emulsion-Gelation Method.

作者信息

Kamal Mohamed Seeni Meera, Heinrich Charlotte, Milow Barbara

机构信息

Department of Aerogels and Aerogel Composites, Institute of Materials Research, German Aerospace Center (DLR), Linder Hoehe, 51147 Cologne, Germany.

出版信息

Polymers (Basel). 2021 Jul 22;13(15):2409. doi: 10.3390/polym13152409.

DOI:10.3390/polym13152409
PMID:34372011
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8348565/
Abstract

Organic aerogels in the form of powder, microgranules and microsized particles receive considerable attention due to their easy fabrication, low process time and costs compared to their monolithic form. Here, we developed resorcinol-formaldehyde (RF) aerogel microparticles by using an emulsion-gelation method. The main objective of this study is to investigate the influence of curing time, stirring rate, RF sol:oil ratio and initial pH of the sol in order to control the size and properties of the microparticles produced. The emulsion-gelation of RF sol prepared with sodium carbonate catalyst in an oil phase at 60 °C was explored. RF microparticles were washed with ethanol to remove the oil phase followed by supercritical and ambient pressure drying. The properties of the dried RF microparticles were analyzed using FT-IR, N adsorption isotherm, gas pycnometry, wide angle X-ray scattering and scanning electron microscope. RF microparticles with high surface area up to 543 m/g and large pore volume of 1.75 cm/g with particle sizes ranging from 50-425 µm were obtained.

摘要

粉末、微粒和微米级颗粒形式的有机气凝胶因其易于制备、加工时间短且成本低（与整体形式相比）而受到广泛关注。在此，我们采用乳液凝胶法制备了间苯二酚-甲醛（RF）气凝胶微粒。本研究的主要目的是研究固化时间、搅拌速率、RF溶胶与油的比例以及溶胶的初始pH值对所制备微粒尺寸和性能的影响。探索了在60℃油相中用碳酸钠催化剂制备的RF溶胶的乳液凝胶化过程。用乙醇洗涤RF微粒以去除油相，然后进行超临界和常压干燥。使用傅里叶变换红外光谱（FT-IR）、氮吸附等温线、气体比重瓶法、广角X射线散射和扫描电子显微镜对干燥后的RF微粒性能进行了分析。获得了比表面积高达543 m²/g、孔体积为1.75 cm³/g且粒径范围为50-425 µm的RF微粒。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/feaf856f8d24/polymers-13-02409-g012.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/22c7df5ed4f0/polymers-13-02409-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/de89dae5b538/polymers-13-02409-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/fee982c4548d/polymers-13-02409-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/627c8b19cd2e/polymers-13-02409-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/7b87380738d4/polymers-13-02409-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/a81f6f373b26/polymers-13-02409-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/feaf856f8d24/polymers-13-02409-g012.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/251eb92c8023/polymers-13-02409-sch001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/7dfed9ce2caf/polymers-13-02409-g001.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/ae0f92618cd8/polymers-13-02409-g002.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/ecd49f08272a/polymers-13-02409-g003.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/4b228b9c156e/polymers-13-02409-g004.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/66fcf22cb3e1/polymers-13-02409-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/22c7df5ed4f0/polymers-13-02409-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/de89dae5b538/polymers-13-02409-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/fee982c4548d/polymers-13-02409-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/627c8b19cd2e/polymers-13-02409-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/7b87380738d4/polymers-13-02409-g010.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/a81f6f373b26/polymers-13-02409-g011.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/1d53/8348565/feaf856f8d24/polymers-13-02409-g012.jpg

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