Evaluation of Two Ultrasonic Methods for Preparing Urea-Formaldehyde Adhesives with Nano-SiO2
This paper evaluates two methods for ultrasonic mixing of nano-SiO2 into urea-formaldehyde (UF) adhesives. Nano-silica (SiO2) was used in the form of 30% colloidal suspension, with the nanoparticles having a diameter of 7 nm. Its addition into the UF adhesive was 15%, based on the dry weight. The...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Editura Universitatii Transilvania din Brasov
2018-12-01
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| Series: | Pro Ligno |
| Subjects: | |
| Online Access: | http://www.proligno.ro/en/articles/2018/4/DJIPOROVIC.pdf |
| _version_ | 1811278561684750336 |
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| author | Milanka DJIPOROVIĆ-MOMČILOVIĆ Ivana GAVRILOVIĆ-GRMUŠA Tijana TODOROVIĆ Mladjan POPOVIĆ Sergej MEDVED Jasmina POPOVIĆ Fadhil HAMID |
| author_facet | Milanka DJIPOROVIĆ-MOMČILOVIĆ Ivana GAVRILOVIĆ-GRMUŠA Tijana TODOROVIĆ Mladjan POPOVIĆ Sergej MEDVED Jasmina POPOVIĆ Fadhil HAMID |
| author_sort | Milanka DJIPOROVIĆ-MOMČILOVIĆ |
| collection | DOAJ |
| description | This paper evaluates two methods for ultrasonic mixing of nano-SiO2 into urea-formaldehyde (UF)
adhesives. Nano-silica (SiO2) was used in the form of 30% colloidal suspension, with the nanoparticles
having a diameter of 7 nm. Its addition into the UF adhesive was 15%, based on the dry weight. The mixing
of these components was performed with a probe-type ultrasonic homogenizer and with an ultrasonic bath,
during 25 minutes of mixing time. The effects of each method were evaluated by SEM microscopy, and the
results showed that the ultrasonic probe achieved much higher and almost complete homogenization of the
UF / nano-SiO2 mixture, in contrast to the ultrasonic bath method. Therefore, the ultrasonic probe was
subsequently used to test the influence of the mixing time on the homogenization level and on the curing
kinetics of the UF adhesive with nano-SiO2. The homogenization level was not significantly altered when
decreasing the mixing time from 25 to 5 minutes. For the same time range, the differential scanning
calorimetry analysis also showed no significant influence of the mixing time on the curing behavior of the UF
adhesive with nano-SiO2. The results of this research provide the basis for a more effective and efficient
mixing procedure when using similar nanomaterials with UF adhesives, without significantly decreasing its
performances. |
| first_indexed | 2024-04-13T00:38:03Z |
| format | Article |
| id | doaj.art-ad3120feaf6f44739775c8b808e4d557 |
| institution | Directory Open Access Journal |
| issn | 1841-4737 2069-7430 |
| language | English |
| last_indexed | 2024-04-13T00:38:03Z |
| publishDate | 2018-12-01 |
| publisher | Editura Universitatii Transilvania din Brasov |
| record_format | Article |
| series | Pro Ligno |
| spelling | doaj.art-ad3120feaf6f44739775c8b808e4d5572022-12-22T03:10:17ZengEditura Universitatii Transilvania din BrasovPro Ligno1841-47372069-74302018-12-011443944Evaluation of Two Ultrasonic Methods for Preparing Urea-Formaldehyde Adhesives with Nano-SiO2Milanka DJIPOROVIĆ-MOMČILOVIĆ0Ivana GAVRILOVIĆ-GRMUŠA1Tijana TODOROVIĆ2Mladjan POPOVIĆ3Sergej MEDVED4Jasmina POPOVIĆ5Fadhil HAMID6University of Belgrade, SerbiaUniversity of Belgrade, SerbiaUniversity of Belgrade, SerbiaUniversity of Belgrade, SerbiaUniversity of Ljubljana, SloveniaUniversity of Belgrade, SerbiaUniversity of Belgrade, SerbiaThis paper evaluates two methods for ultrasonic mixing of nano-SiO2 into urea-formaldehyde (UF) adhesives. Nano-silica (SiO2) was used in the form of 30% colloidal suspension, with the nanoparticles having a diameter of 7 nm. Its addition into the UF adhesive was 15%, based on the dry weight. The mixing of these components was performed with a probe-type ultrasonic homogenizer and with an ultrasonic bath, during 25 minutes of mixing time. The effects of each method were evaluated by SEM microscopy, and the results showed that the ultrasonic probe achieved much higher and almost complete homogenization of the UF / nano-SiO2 mixture, in contrast to the ultrasonic bath method. Therefore, the ultrasonic probe was subsequently used to test the influence of the mixing time on the homogenization level and on the curing kinetics of the UF adhesive with nano-SiO2. The homogenization level was not significantly altered when decreasing the mixing time from 25 to 5 minutes. For the same time range, the differential scanning calorimetry analysis also showed no significant influence of the mixing time on the curing behavior of the UF adhesive with nano-SiO2. The results of this research provide the basis for a more effective and efficient mixing procedure when using similar nanomaterials with UF adhesives, without significantly decreasing its performances.http://www.proligno.ro/en/articles/2018/4/DJIPOROVIC.pdfUF adhesives; nano-SiO2; ultrasonic mixing; homogenization level; curing kinetics |
| spellingShingle | Milanka DJIPOROVIĆ-MOMČILOVIĆ Ivana GAVRILOVIĆ-GRMUŠA Tijana TODOROVIĆ Mladjan POPOVIĆ Sergej MEDVED Jasmina POPOVIĆ Fadhil HAMID Evaluation of Two Ultrasonic Methods for Preparing Urea-Formaldehyde Adhesives with Nano-SiO2 Pro Ligno UF adhesives; nano-SiO2; ultrasonic mixing; homogenization level; curing kinetics |
| title | Evaluation of Two Ultrasonic Methods for Preparing Urea-Formaldehyde Adhesives with Nano-SiO2 |
| title_full | Evaluation of Two Ultrasonic Methods for Preparing Urea-Formaldehyde Adhesives with Nano-SiO2 |
| title_fullStr | Evaluation of Two Ultrasonic Methods for Preparing Urea-Formaldehyde Adhesives with Nano-SiO2 |
| title_full_unstemmed | Evaluation of Two Ultrasonic Methods for Preparing Urea-Formaldehyde Adhesives with Nano-SiO2 |
| title_short | Evaluation of Two Ultrasonic Methods for Preparing Urea-Formaldehyde Adhesives with Nano-SiO2 |
| title_sort | evaluation of two ultrasonic methods for preparing urea formaldehyde adhesives with nano sio2 |
| topic | UF adhesives; nano-SiO2; ultrasonic mixing; homogenization level; curing kinetics |
| url | http://www.proligno.ro/en/articles/2018/4/DJIPOROVIC.pdf |
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