Molecular Structure and Decomposition Kinetics of Kaolinite/Alkylamine Intercalation Compounds
Although the development of clay/polymer nanocomposites and their applications have attracted much attention in recent years, a thorough understanding of the structure and the decomposition mechanism of clay/polymer nanocomposites is still lacking. In this research, the intercalation of kaolinite (K...
| Main Authors: | , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2018-07-01
|
| Series: | Frontiers in Chemistry |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/article/10.3389/fchem.2018.00310/full |
| _version_ | 1819038665756639232 |
|---|---|
| author | Yi Zhou Yi Zhou Qinghe Liu Peijie Xu Hongfei Cheng Hongfei Cheng Qinfu Liu |
| author_facet | Yi Zhou Yi Zhou Qinghe Liu Peijie Xu Hongfei Cheng Hongfei Cheng Qinfu Liu |
| author_sort | Yi Zhou |
| collection | DOAJ |
| description | Although the development of clay/polymer nanocomposites and their applications have attracted much attention in recent years, a thorough understanding of the structure and the decomposition mechanism of clay/polymer nanocomposites is still lacking. In this research, the intercalation of kaolinite (Kaol) with different alkylamines were investigated by X-ray diffracion (XRD), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetry and differential scanning calorimetry (TG-DSC). The results showed that the intercalation of Kaol/methanol compound with hexylamine (HA), dodecylamine (DA), and octadecylamine (OA) led to the expansion of the interlayer distance and resulted in the dominant basal diffraction at 2.86, 4.08, and 5.66 nm. The alky chains of HA, DA, and OA are tilted toward the Kaol surface in bilayer with an inclination angle of ~40°. The most probable mechanism function, activation energy E, and pre-exponential factor A were obtained by mutual authentication using KAS and Ozawa methods, itrative and Satava integral method. The average activation energy E of the three intercalation compounds are 104.44, 130.80, and 154.59 kJ mol−1, respectively. It shows a positive correlation with the alkyl chain length. The pre-exponential factor A was estimated to be 1.09 × 1015, 1.15 × 108, and 4.17 × 1021 s−1, respectively. The optimized mechanism function for the decomposition of alkylamine is G(α) = [(1-α) −1/3−1]2. |
| first_indexed | 2024-12-21T08:40:56Z |
| format | Article |
| id | doaj.art-6ec898cb1e3d46edb212953bec730b16 |
| institution | Directory Open Access Journal |
| issn | 2296-2646 |
| language | English |
| last_indexed | 2024-12-21T08:40:56Z |
| publishDate | 2018-07-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Chemistry |
| spelling | doaj.art-6ec898cb1e3d46edb212953bec730b162022-12-21T19:09:57ZengFrontiers Media S.A.Frontiers in Chemistry2296-26462018-07-01610.3389/fchem.2018.00310399680Molecular Structure and Decomposition Kinetics of Kaolinite/Alkylamine Intercalation CompoundsYi Zhou0Yi Zhou1Qinghe Liu2Peijie Xu3Hongfei Cheng4Hongfei Cheng5Qinfu Liu6School of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing, ChinaDepartment of Chemical and Biomolecular Engineering and Polymer Program, Institute of Materials Science, University of Connecticut, Storrs, CT, United StatesSchool of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing, ChinaSchool of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing, ChinaSchool of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing, ChinaSchool of Environmental Science and Engineering, Chang'an University, Xi'an, ChinaSchool of Geoscience and Surveying Engineering, China University of Mining & Technology, Beijing, ChinaAlthough the development of clay/polymer nanocomposites and their applications have attracted much attention in recent years, a thorough understanding of the structure and the decomposition mechanism of clay/polymer nanocomposites is still lacking. In this research, the intercalation of kaolinite (Kaol) with different alkylamines were investigated by X-ray diffracion (XRD), Fourier-transform infrared spectroscopy (FTIR), and thermogravimetry and differential scanning calorimetry (TG-DSC). The results showed that the intercalation of Kaol/methanol compound with hexylamine (HA), dodecylamine (DA), and octadecylamine (OA) led to the expansion of the interlayer distance and resulted in the dominant basal diffraction at 2.86, 4.08, and 5.66 nm. The alky chains of HA, DA, and OA are tilted toward the Kaol surface in bilayer with an inclination angle of ~40°. The most probable mechanism function, activation energy E, and pre-exponential factor A were obtained by mutual authentication using KAS and Ozawa methods, itrative and Satava integral method. The average activation energy E of the three intercalation compounds are 104.44, 130.80, and 154.59 kJ mol−1, respectively. It shows a positive correlation with the alkyl chain length. The pre-exponential factor A was estimated to be 1.09 × 1015, 1.15 × 108, and 4.17 × 1021 s−1, respectively. The optimized mechanism function for the decomposition of alkylamine is G(α) = [(1-α) −1/3−1]2.https://www.frontiersin.org/article/10.3389/fchem.2018.00310/fullkaolinitealkylamineintercalationstructural modeldecomposition |
| spellingShingle | Yi Zhou Yi Zhou Qinghe Liu Peijie Xu Hongfei Cheng Hongfei Cheng Qinfu Liu Molecular Structure and Decomposition Kinetics of Kaolinite/Alkylamine Intercalation Compounds Frontiers in Chemistry kaolinite alkylamine intercalation structural model decomposition |
| title | Molecular Structure and Decomposition Kinetics of Kaolinite/Alkylamine Intercalation Compounds |
| title_full | Molecular Structure and Decomposition Kinetics of Kaolinite/Alkylamine Intercalation Compounds |
| title_fullStr | Molecular Structure and Decomposition Kinetics of Kaolinite/Alkylamine Intercalation Compounds |
| title_full_unstemmed | Molecular Structure and Decomposition Kinetics of Kaolinite/Alkylamine Intercalation Compounds |
| title_short | Molecular Structure and Decomposition Kinetics of Kaolinite/Alkylamine Intercalation Compounds |
| title_sort | molecular structure and decomposition kinetics of kaolinite alkylamine intercalation compounds |
| topic | kaolinite alkylamine intercalation structural model decomposition |
| url | https://www.frontiersin.org/article/10.3389/fchem.2018.00310/full |
| work_keys_str_mv | AT yizhou molecularstructureanddecompositionkineticsofkaolinitealkylamineintercalationcompounds AT yizhou molecularstructureanddecompositionkineticsofkaolinitealkylamineintercalationcompounds AT qingheliu molecularstructureanddecompositionkineticsofkaolinitealkylamineintercalationcompounds AT peijiexu molecularstructureanddecompositionkineticsofkaolinitealkylamineintercalationcompounds AT hongfeicheng molecularstructureanddecompositionkineticsofkaolinitealkylamineintercalationcompounds AT hongfeicheng molecularstructureanddecompositionkineticsofkaolinitealkylamineintercalationcompounds AT qinfuliu molecularstructureanddecompositionkineticsofkaolinitealkylamineintercalationcompounds |