NDLI: Flexible polybenzoxazine thermosets with high glass transition temperatures and low surface free energies

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Back cover

Polymer Chemistry Vol - 3 Issue - 3

Polymer Chemistry Vol - 3 Issue - 2

Polymer Chemistry Vol -2

Polymer Chemistry Vol -1

Flexible polybenzoxazine thermosets with high glass transition temperatures and low surface free energies

Content Provider	Royal Society of Chemistry (RSC)
Author	Lin, Ching Hsuan Shih, Yu Sin Wang, Chih Feng Lin, Hong Tze Chang, Sheng Lung Shen, Ting Yi
Copyright Year	2012
Abstract	Four main-chain type polybenzoxazine precursors were synthesized from the Mannich-type polycondensation of biphenol A, paraformaldehyde, and four typical aromatic diamines: 1,4-phenylenediamine, 4,4′-diaminodiphenyl methane, 4,4′-diaminodiphenyl ether, and 2,2-bis[4-(4-aminophenoxy)phenyl]propane. The solvent effect on the polycondensation was examined. We found that polybenzoxazine precursors prepared in toluene/ethanol exhibit higher purity, higher molecular weight, and lead to better thermal properties after curing than those prepared in chloroform, as recommended by Takeichi's group (T. Takeichi et al., Polymer, 2005, 46, 12172). The cured polybenzoxazine films prepared by these polybenzoxazine precursors display unusual flexibility, extremely high Tg, and low surface energy. They show Tg values as high as 272–353 °C (DMA data), coefficients of thermal expansion as low as 39–49 ppm/°C, contact angles as high as 100–102°, and surface energy as low as 17.7–24.5 mJ m−2.
Starting Page	935
Ending Page	945
Page Count	11
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	3
Issue Number	4
Journal	Polymer Chemistry
DOI	10.1039/c2py00449f
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Paraformaldehyde Methane Ether Ethanol Chloroform Toluene Phenyl group P-Phenylenediamine Thermal expansion Takeichi Mannich reaction The Cured Condensation polymer Dimethylacetamide Solvent Propane Surface energy
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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Flexible polybenzoxazine thermosets with high glass transition temperatures and low surface free energies

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