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Positron porosimetry study of mesoporous polymer–silica composites
| Content Provider | Paperity |
|---|---|
| Author | Goworek, Jacek Gorgol, Marek Kierys, Agnieszka Zaleski, Radosław |
| Abstract | The polymer–SiO2 composites prepared using polymers with different chemical composition and porosity (i.e. XAD4, XAD16, and XAD7) as well as series of composites synthesized with different contents of silica species and at different pH were investigated. The study was conducted to compare the results of nitrogen adsorption and positron porosimetry for these three sets of samples. The possible causes of the inconsistency between the results of both methods are discussed. The impact of the chemical character of the polymer support surface on the final properties of the polymer–silica composite was found to be greater than its porosity (i.e. the shape of pores and their connectivity). Changing the SiO2 content influences mostly the pore volume of composites. To significantly modify their pore size distribution, more than 30 wt% of silica species are required. The composite synthesized at pH 5 has the widest pore size distribution among all samples supported by XAD7. The discrepancies concerning the porosity derived with both methods are the smallest for composites where XAD7 was used as the support. This allows determination of the relation V = (3.38 VPALS−0.03) cm3/g, which may be useful for estimation of pore volumes corresponding to those found by nitrogen adsorption. |
| Starting Page | 745 |
| Ending Page | 754 |
| File Format | HTM / HTML |
| ISSN | 09295607 |
| DOI | 10.1007/s10450-016-9772-2 |
| Issue Number | 4-6 |
| Journal | Adsorption |
| Volume Number | 22 |
| e-ISSN | 15728757 |
| Language | English |
| Publisher | Springer US |
| Publisher Date | 2016-02-01 |
| Access Restriction | Open |
| Subject Keyword | Porous polymers Positronium lifetime Nitrogen adsorption Porosimetry Polymer–silica composites |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Chemical Engineering Surfaces and Interfaces |
