Synthesis and characterization of polyboronicsiloxanes
The majority of these injuries are caused by athletes who did not wear protective equipment, demonstrating the importance of wearing protective equipment. Around 75 million people worldwide suffer from different forms of sports-related injuries annually. Impact-absorbing protective equipment i...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
Nanyang Technological University
2022
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| Online Access: | https://hdl.handle.net/10356/156227 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | The majority of these injuries are caused by athletes who did not wear protective
equipment, demonstrating the importance of wearing protective equipment. Around
75 million people worldwide suffer from different forms of sports-related injuries
annually. Impact-absorbing protective equipment is widely used to prevent injuries. In
terms of impact protection, shear stiffening gels (SSG) offer several advantages
including fast response time, self-healing properties, and adaptability to stress fields
and mechanical stress. The most successful representative of an SSG is
Polyborosiloxane (PBS). PBS has unique properties that offer excellent flexibility and
impact resistance. Even though the material is brittle under rapid extensional strain, it
still reveals significant viscoelasticity, enabling it to be used in shock absorbers and
damping buffers. Boronic acid reacts with polydimethylsiloxane (PDMS) to form
boron bonds, which is believed to be responsible for this property. There is still
uncertainty as to what type of dynamic bonds affects the dynamic properties of PBS.
The study aims to prove that the B-O dative bonds are shown to be the major cause of
the unique shear-stiffening properties of PBS. |
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