Synthesis and characterization of phenolic resins with ethylene bridges

Patel, Mohan N.; Patel, J. B.

doi:10.1002/apmc.1981.050970116

Cited by 11 publications

(2 citation statements)

References 6 publications

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“…Here the preferred attack of butylene glycol would be at positions 3 and 5 as they are ortho with respect to the electron-releasing A strong band (Vc_o) at 1,630cm-1 and a weak band around 2,750cm-i indicate an intramolecular hydrogen bonding (Makanishi 1964). The inflection around 2,895 crn-1 can be assigned to C-H stretching of the butylene bridge of the polymeric chain (Patel and Patel 1981). Accordingly each phenyl ring (except the end groups of the chain would 1, 2, 3, 4, 5-pentasubstituted and contain only one isolated H-atom.…”

Section: Resultsmentioning

confidence: 99%

Poly (1,3-[2-methoxy-4-hydroxy-5-acetylphenylene] butylene) (HMAP-BG) as a polymeric ligand

Upadhyaya

Patel

1991

Proc. Indian Acad. Sci. (Chem. Sci.)

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Poly(l,-acetylphenylene]butylene) was prepared by FriedcI-Craft polycondensation of 2-hydroxy, 4-methoxyacetophenone and 1,4-butane-dioi in presence of polyphosphoric acid catalyst. The polymer samples were characterized by IR spectra, TGA and their M. determined by nonaqueous titration. Viscosity measurents in DMSO showed that solutions exhibited normal behaviour.Polymers were eomplexed with Cu(II), Ni(ll), Mn(II), Co(II) and Zn(II) and characterized. Chelation and ion exchange properties were also studied by employing the batch equilibrium method.

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Section: Resultsmentioning

confidence: 99%

Poly (1,3-[2-methoxy-4-hydroxy-5-acetylphenylene] butylene) (HMAP-BG) as a polymeric ligand

Upadhyaya

Patel

1991

Proc. Indian Acad. Sci. (Chem. Sci.)

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“…One of three products is formed based on whether the formaldehyde reacts at the orthoor parasite, denoted as o-o', o-p', p-p' bonded phenols via a methylene bridge. The cure mechanism is known to be complex, and further side products have been identified empirically using spectral analysis, e.g., 1 H and 13 C nuclear magnetic resonance (NMR) or Fourier transform infrared (FTIR) spectroscopy, of phenolic resins [26]. These structures originate from the condensation of hydroxymethyl groups of two HMPs bonding together to form an ethylene bridge, or reacting at the hydroxide group.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach to Atomistic Molecular Dynamics Simulation of Phenolic Resins Using Symthons

et al. 2020

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Materials science is beginning to adopt computational simulation to eliminate laboratory trial and error campaigns—much like the pharmaceutical industry of 40 years ago. To further computational materials discovery, new methodology must be developed that enables rapid and accurate testing on accessible computational hardware. To this end, the authors utilise a novel methodology concept of intermediate molecules as a starting point, for which they propose the term ‘symthon’ (The term ‘Symthon’ is being used as a simulation equivalent of the synthon, popularised by Dr Stuart Warren in ‘Organic Synthesis: The Disconnection Approach’, OUP: Oxford, 1983.) rather than conventional monomers. The use of symthons eliminates the initial monomer bonding phase, reducing the number of iterations required in the simulation, thereby reducing the runtime. A novel approach to molecular dynamics, with an NVT (Canonical) ensemble and variable unit cell geometry, was used to generate structures with differing physical and thermal properties. Additional script methods were designed and tested, which enabled a high degree of cure in all sampled structures. This simulation has been trialled on large-scale atomistic models of phenolic resins, based on a range of stoichiometric ratios of formaldehyde and phenol. Density and glass transition temperature values were produced, and found to be in good agreement with empirical data and other simulated values in the literature. The runtime of the simulation was a key consideration in script design; cured models can be produced in under 24 h on modest hardware. The use of symthons has been shown as a viable methodology to reduce simulation runtime whilst generating accurate models.

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Systematic study of ion‐exchange properties and ligating behaviour of respropiophenone‐formaldehyde copolymers

Patel¹,

Patel²

1989

Angew. Makromol. Chem.

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Respropiophenone‐formaldehyde copolymers (RPP‐F) were synthezised by the condensation of 2,4‐dihydroxypropiophenone (respropiophenone (RPP)) and formaldehyde (F) in the presence of NaOH or H2SO4 as catalyst with varied molar ratios of reacting monomers. The copolymers were characterized by elemental analysis, IR spectra, viscosity, and TGA studies. Their M̄n was determined by nonaqueous conductometric titrations and vapour pressure osmometry (VPO). Chelation ion‐exchange properties have also been studied employing the batch equilibration method. Polychelates of Cu(II), Ni(II), Co(II), Mn(II), Zn(II), VO(II), and UO2(II) with RPP‐F‐AI copolymer were prepared. The analytical data agree with 1 : 2 metal‐ligand stoichiometry. Elemental analysis, magnetic, spectral, and thermal properties of polychelates have been studied and probable structures are assigned to the polychelates. All the polychelates are amorphous powders, insoluble in common organic solvents.

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Synthesis and characterization of phenolic resins with ethylene bridges

Cited by 11 publications

References 6 publications

Poly (1,3-[2-methoxy-4-hydroxy-5-acetylphenylene] butylene) (HMAP-BG) as a polymeric ligand

Poly (1,3-[2-methoxy-4-hydroxy-5-acetylphenylene] butylene) (HMAP-BG) as a polymeric ligand

A Novel Approach to Atomistic Molecular Dynamics Simulation of Phenolic Resins Using Symthons

Systematic study of ion‐exchange properties and ligating behaviour of respropiophenone‐formaldehyde copolymers

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