Synthesis and characterization of epoxidized polyhedral oligomeric cubic silsesquioxanes (CSSQ) for UV curing applications
Polyhedral oligomeric silsesquioxanes (POSS) have emerged in recent years as a novel class of nanostructured organosilicon compounds which have been applied in the design of new inorganic-organic hybrid nanocomposite materials. The versatility of preparing POSS compounds functionalized with differen...
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
| Published: |
2011
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/44766 |
| _version_ | 1811680912167927808 |
|---|---|
| author | Yeo, Reuben Jueyuan. |
| author2 | Marc Jean Medard Abadie |
| author_facet | Marc Jean Medard Abadie Yeo, Reuben Jueyuan. |
| author_sort | Yeo, Reuben Jueyuan. |
| collection | NTU |
| description | Polyhedral oligomeric silsesquioxanes (POSS) have emerged in recent years as a novel class of nanostructured organosilicon compounds which have been applied in the design of new inorganic-organic hybrid nanocomposite materials. The versatility of preparing POSS compounds functionalized with different functional groups allows for the properties of such materials to be tailored for various applications. One such application that was explored is the design of UV-curable photoresists using epoxidized POSS incorporated into an epoxy resin. A general synthesis route was proposed in this work to prepare unfunctionalized cubic POSS (CSSQ), mono-epoxy and di-epoxy CSSQ via hydrolytic condensation of alkoxysilane precursors, which was followed by characterization to investigate their chemical and physical properties. Fourier-transformed infrared (FTIR) spectroscopy confirmed the presence of CSSQ and epoxidized CSSQ structures in the as-synthesized samples, although the presence of other cage structures of POSS in the samples were not determined. Thermogravimetric analyses (TGA) showed a higher thermal stability for epoxidized CSSQ compared to CSSQ, whereas X-ray diffraction (XRD) revealed an amorphous structure for epoxidized CSSQ. Differential photocalorimetry (DPC) was also performed on epoxidized CSSQ to study their UV curing kinetics. However, the epoxidized CSSQ samples were observed not to undergo photopolymerization under a strong intensity of UV irradiation (~800 mW/cm2), which could have been due to insufficient concentrations of photoinitiator used in the formulation. Subsequent studies could be done to further investigate the UV curing kinetics of epoxidized CSSQ. |
| first_indexed | 2024-10-01T03:32:35Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/44766 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T03:32:35Z |
| publishDate | 2011 |
| record_format | dspace |
| spelling | ntu-10356/447662023-03-04T15:33:02Z Synthesis and characterization of epoxidized polyhedral oligomeric cubic silsesquioxanes (CSSQ) for UV curing applications Yeo, Reuben Jueyuan. Marc Jean Medard Abadie School of Materials Science and Engineering DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Science::Chemistry::Organic chemistry::Organometallic compounds DRNTU::Engineering::Materials::Material testing and characterization Polyhedral oligomeric silsesquioxanes (POSS) have emerged in recent years as a novel class of nanostructured organosilicon compounds which have been applied in the design of new inorganic-organic hybrid nanocomposite materials. The versatility of preparing POSS compounds functionalized with different functional groups allows for the properties of such materials to be tailored for various applications. One such application that was explored is the design of UV-curable photoresists using epoxidized POSS incorporated into an epoxy resin. A general synthesis route was proposed in this work to prepare unfunctionalized cubic POSS (CSSQ), mono-epoxy and di-epoxy CSSQ via hydrolytic condensation of alkoxysilane precursors, which was followed by characterization to investigate their chemical and physical properties. Fourier-transformed infrared (FTIR) spectroscopy confirmed the presence of CSSQ and epoxidized CSSQ structures in the as-synthesized samples, although the presence of other cage structures of POSS in the samples were not determined. Thermogravimetric analyses (TGA) showed a higher thermal stability for epoxidized CSSQ compared to CSSQ, whereas X-ray diffraction (XRD) revealed an amorphous structure for epoxidized CSSQ. Differential photocalorimetry (DPC) was also performed on epoxidized CSSQ to study their UV curing kinetics. However, the epoxidized CSSQ samples were observed not to undergo photopolymerization under a strong intensity of UV irradiation (~800 mW/cm2), which could have been due to insufficient concentrations of photoinitiator used in the formulation. Subsequent studies could be done to further investigate the UV curing kinetics of epoxidized CSSQ. Bachelor of Engineering (Materials Engineering) 2011-06-03T08:04:05Z 2011-06-03T08:04:05Z 2011 2011 Final Year Project (FYP) http://hdl.handle.net/10356/44766 en Nanyang Technological University 43 p. application/pdf |
| spellingShingle | DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Science::Chemistry::Organic chemistry::Organometallic compounds DRNTU::Engineering::Materials::Material testing and characterization Yeo, Reuben Jueyuan. Synthesis and characterization of epoxidized polyhedral oligomeric cubic silsesquioxanes (CSSQ) for UV curing applications |
| title | Synthesis and characterization of epoxidized polyhedral oligomeric cubic silsesquioxanes (CSSQ) for UV curing applications |
| title_full | Synthesis and characterization of epoxidized polyhedral oligomeric cubic silsesquioxanes (CSSQ) for UV curing applications |
| title_fullStr | Synthesis and characterization of epoxidized polyhedral oligomeric cubic silsesquioxanes (CSSQ) for UV curing applications |
| title_full_unstemmed | Synthesis and characterization of epoxidized polyhedral oligomeric cubic silsesquioxanes (CSSQ) for UV curing applications |
| title_short | Synthesis and characterization of epoxidized polyhedral oligomeric cubic silsesquioxanes (CSSQ) for UV curing applications |
| title_sort | synthesis and characterization of epoxidized polyhedral oligomeric cubic silsesquioxanes cssq for uv curing applications |
| topic | DRNTU::Engineering::Materials::Nanostructured materials DRNTU::Science::Chemistry::Organic chemistry::Organometallic compounds DRNTU::Engineering::Materials::Material testing and characterization |
| url | http://hdl.handle.net/10356/44766 |
| work_keys_str_mv | AT yeoreubenjueyuan synthesisandcharacterizationofepoxidizedpolyhedraloligomericcubicsilsesquioxanescssqforuvcuringapplications |