Effects of oxazine functionality on properties of benzoxazine resins via solventless synthesis

Name: Amornrat Saengpech

Organization : Chulalongkorn University. Faculty of Engineering

Name: Sarawut Rimdusit

Organization : Chulalongkorn University. Faculty of Engineering

Email : sarawut.r@chula.ac.th

keyword: Polybenzoxazine

LCSH: Phenolic resins

LCSH: Morpholine

Abstract: Benzoxazine resins of varied functionalities, namely a monofunctional phenol based benzoxazine (Ph-a), a bifunctional bisphenol-A based benzoxazine (BA-a) and a trifunctional 1,1,1tris(4-hydroxyphenyl)ethane based benzoxazine (Tris P-a) were synthesized by solventless technique from the reaction with an aromatic aniline and paraformaldehyde to render one-, two-, and three-oxazine rings in their structures. After synthesis, the chemical structures of the monomers were confirmed by Fourier transforms infrared spectroscopy. Thermal and mechanical properties of the obtained benzoxazine resins including curing behaviors and some major thermophysical properties were evaluated using differential scanning calorimetry, dynamic mechanical analysis and thermogravimetric analysis. It was found that glass transition temperature was increased with increasing oxazine rings as followed: Tris P-a > BA-a > Ph-a. Moreover, degradation temperatures at 5% weight as well as char yield of the obtained polybenzoxazines were in the range of 298- 340 °C and 29-41% respectively. Td values were also found to increase with number of oxazine rings in the monomers. Furthermore, the storage modulus (E′) of polybenzoxazine was also increased with an increase in the monomer functionalities due to the greater crosslink density of the fully cured polymers. These results showed a successful preparation of the three monomers and their fully cured polymers using an environmentally friendly and cost-effective solventless technique.

King Mongkut's University of Technology North Bangkok. Central Library

Address: BANGKOK

Email: library@kmutnb.ac.th

Created: 2016

Modified: 2023-01-06

Issued: 2023-01-06

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BibliograpyCitation : In Chemical Society of Thailand under the Patronage of Professor Dr. HRH Princess Chulabhorn and Chulalongkorn University Faculty of science. Pure and Applied Chemistry International Conference (PACCON 2016) (pp.1321-1325). Bangkok : Chemical Society of Thailand under the Patronage of Professor Dr. HRH Princess Chulabhorn

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