Self-focusing in polymers

Rao, D. V. G. L. N.; Bickford, James H.; Shere, A. J.; Muthukumar, M.

doi:10.1002/pol.1990.140280802

Cited by 6 publications

(7 citation statements)

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“…In the second step, maleamic acid was dissolved in DMF and toluene (1:12 by volume) and refluxed with pTSA catalyst (0.025 mol for 0.3 mol of HPA) to obtain the imide (as per the reported procedure). [17][18][19][20] HPM was melted at 181.6°C, which matches the reported value of 181-2°C. 18 The ladder-like polymers were polysilsesquioxanes containing chloropropyl side groups (ladder A) and a copolymer containing 50 mol % each of the methyl and chloropropyl side groups (ladder B).…”

Section: Synthesissupporting

confidence: 83%

Synthesis, characterization, and curing kinetics of novel ladder‐like polysilsesquioxanes containing side‐chain maleimide groups

Krishnan

Shang

2004

J. Polym. Sci. A Polym. Chem.

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Two ladder-like polysilsesquioxanes (LPS) containing side-chain maleimide groups have been synthesized successfully by reacting N-(4-hydroxyphenyl)maleimide (HPM) with LPS containing 100 mol % of chloropropyl groups (Ladder A) and 50 mol % of each methyl and chloropropyl group (Ladder B). HPM was synthesized by reacting maleic anhydride with 4-aminophenol, and the resulting amic acid was imidized using p-toluenesulfonic acid as a catalyst (Scheme 1). The LPSs were characterized by Fourier transform infrared (FTIR), 1 H nuclear magnetic resonance (NMR), proton-decoupled 13 C NMR, 29 Si NMR, wide-angle X-ray diffraction (WAXD), differential scanning calorimetry (DSC), and thermogravimetric analysis (TGA). Characterization indicated that these polymers had ordered ladder-like structures with possible defects. These polymers were soluble in common solvents at ambient temperature, which suggested that they were not crosslinked. Both the polymers and the HPM were cured, and their kinetics were followed by dynamic DSC. The Ozawa and Kissinger methods were used to calculate activation energies for curing. Curing increased the temperature at which both 5% weight loss and maximum rate of weight loss were observed.

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Section: Synthesissupporting

confidence: 83%

Synthesis, characterization, and curing kinetics of novel ladder‐like polysilsesquioxanes containing side‐chain maleimide groups

Krishnan

Shang

2004

J. Polym. Sci. A Polym. Chem.

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“…4FMI was synthesized according to the method of Rao. 20 Maleic anhydride (9.8 g, 0.1 mol) was dissolved in 100 mL of dry dimethylformamide, and then 9.5 mL (0.1 mol) of 4-fluoroaniline was added to the stirring solution drop by drop. The reaction solution was stirred and maintained at room temperature for 3 h. Next, 50 mL of acetic anhydride and 4 g of sodium acetate were added to this reaction solution, and the mixture was maintained at 50°C, with stirring, for another 3 h. Then, the mixture was cooled to room temperature and poured into a large amount of distilled water.…”

Section: Methodsmentioning

confidence: 99%

Protective flexible coatings on copper by spontaneous polymerization

Zheng

Nainani

Bell

2002

J of Applied Polymer Sci

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Spontaneous polymerization (S-Poly) is a novel process for forming protective polymer coatings on metals. The S-Poly mechanism on copper is discussed for one typical monomer system. Poly(ethylene glycol) ethyl ether methacrylate (EEM), a flexible monomer, was first introduced into a styrene/N-phenyl maleimide system that we had used for aluminum and steel. The effects of EEM on the composition, apparent molecular weight, thermal properties, and other properties of the coatings were studied with reflectance Fourier transform infrared, gel permeation chromatography, differential scanning calorimetry, and water-uptake and adhesion experiments. N-(4-Fluorophenyl) maleimide (4FMI), a strongly hydrophobic monomer, was further incorporated into the EEM copolymer for improved water impermeability. The resultant coatings, which included EEM and 4FMI units, showed good bonding strength to copper and better ductility and protective properties than other coatings in both corrosion and pinhole tests.

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“…An interesting approach to maleimide terminated phenoxy resins has recently been described [22]. Para-maleimidobenzoic acid was reacted with bisglycidyl-bisphenol-A epoxy resin in the presence of a catalyst to provide the bismaleimide of formula VII (Figure 4.6).…”

Section: Bismaleimide Building Blocksmentioning

confidence: 99%

Chemistry and properties of addition polyimides

Stenzenberger¹

1990

Polyimides

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Recent years have seen a rapid development in the area of temperatureresistant thermosets. Polyimides in particular are gaining wide acceptance by the industry because they combine a number of unique features. These include excellent physical property retention at elevated temperatures and in wet environments, almost constant electrical properties over a wide range of temperatures and non-flammability properti

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Self-focusing in polymers

Cited by 6 publications

References 0 publications

Synthesis, characterization, and curing kinetics of novel ladder‐like polysilsesquioxanes containing side‐chain maleimide groups

Synthesis, characterization, and curing kinetics of novel ladder‐like polysilsesquioxanes containing side‐chain maleimide groups

Protective flexible coatings on copper by spontaneous polymerization

Chemistry and properties of addition polyimides

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