Synthesis and Properties of Silica-Modified Polybenzoxazine

Materials Science Forum ◽

10.4028/www.scientific.net/msf.449-452.1157 ◽

2004 ◽

Vol 449-452 ◽

pp. 1157-1160 ◽

Cited By ~ 28

Author(s):

Tarek Agag ◽

Tsutomu Takeichi

Keyword(s):

Mechanical Properties ◽

Ir Spectra ◽

Ring Opening ◽

Thermal And Mechanical Properties ◽

Noticeable Effect ◽

Hydrolysis And Condensation ◽

Silica Hybrids ◽

Thermally Treated

A series of polybenzoxazine-silica hybrids was papered by blending benzoxazine monomer with various ratios of tetraethoxysilane (TEOS) as a precursor for silica. The blends after hydrolysis and condensation of TEOS were thermally treated gradually up to 240oC to afford the hybrids. The IR spectra and DSC showed the completion of the ring opening of benzoxazine monomer and formation of silica by the end of the 240oC cure. The inclusion of silica into polybenzoxazine matrix has a noticeable effect on the thermal and mechanical properties.

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Augmenting thermal and mechanical properties of epoxy thermosets: The role of thermally-treated versus surface-modified TiO2 nanoparticles

Materials Express ◽

10.1166/mex.2014.1144 ◽

2014 ◽

Vol 4 (1) ◽

pp. 54-64 ◽

Cited By ~ 8

Author(s):

Zakya Rubab ◽

Adeel Afzal ◽

Humaira M. Siddiqi ◽

Shaukat Saeed

Keyword(s):

Mechanical Properties ◽

Thermal And Mechanical Properties ◽

Surface Modified ◽

Thermally Treated

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The Unsaturated Polyester Via Ring-Opening Metathesis Polymerization (ROMP) of ω-6-Hexadecenlactone

Current Organic Synthesis ◽

10.2174/1570179414666171011155831 ◽

2018 ◽

Vol 15 (4) ◽

pp. 566-571 ◽

Cited By ~ 1

Author(s):

Araceli Martinez ◽

Mikhail A. Tlenkopatchev ◽

Selena Gutierrez

Keyword(s):

Mechanical Properties ◽

Ring Opening ◽

Unsaturated Polyester ◽

Thermal And Mechanical Properties ◽

Ring Opening Metathesis Polymerization ◽

Strain Measurements ◽

Metathesis Polymerization ◽

Molecular Weights ◽

Wide Range ◽

Percent Crystallinity

Background: Ring opening metathesis polymerization of lactones using alkylidene catalysts is an alternative to obtain unsaturated linear polyesters with remarkable thermal and mechanical properties. Also, these polyesters have properties of biodegradability which opens up a wide range of applications as environmentally friendly thermoplastics and biomaterials. Objective: This research aims to present one route to obtain an unsaturated linear polyester poly(ω-6- hexadecenlactone) via ring opening-metathesis polymerization of ω-6-hexadecenlactone using the rutheniumalkylidene [Ru(Cl)2(=CHPh)(PCy3)2] (I), [Ru(Cl2)(=CHPh)(1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene)( PCy3)] (II) and [Ru(Cl2)(=CH(o-isopropoxyphenylmethylene))(1,3-bis(2,4,6-trimethylphenyl)-2-imidazolidinylidene)] (III) and the ruthenium-vinylidene [RuCl2(=C=CH(p-C6H4CF3))(PCy3)2] (IV) catalysts. Conclusion: The high number-average molecular weights of the poly(ω-6-hexadecenlactone) between Mn = 114,800-155,400 g/mol and yields ranging from 96 to 98 % can be achieved by II and III catalysts. The catalysts II and III with the N-heterocyclic carbene ligand showed superior activity and stability upon catalysts I and IV bearing PCy3 ligands. The hydrogenation of poly(ω-6-hexadecenlactone) using Wilkinson catalyst [RhCl(PPh3)3] was studied. The percent crystallinity of the unsaturated poly(ω-6-hexadecenlactone) was 31% with a melting temperature 47.60ºC. Stress-strain measurements of several poly(ω-6-hexadecenlactone) were determined.

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