Thermal degradation of polymers with aromatic rings in the chain

Lancaster, J. M.; Wright, Betty A.; Wright, W. W.

doi:10.1002/app.1965.070090527

Cited by 38 publications

(2 citation statements)

References 2 publications

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“…Thus aromatic polyamides containing aryl ether, aryl sulfone, or aryl sulfone ether linkages are well known in the literature'-* for their superior solubility in organic solvents in addition to excellent chain flexibility and tractability, high thennooxidative stability, and mechanical properties. 5- 8 Generally, these polymers are amorphous and have low glass transition temperatures. They have good potential for commercial exploitation.…”

Section: Introductionmentioning

confidence: 99%

Polyaramides containing arylene sulfone ether linkages

Idage

Vernekar

1989

J of Applied Polymer Sci

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SynopsisPolyamides containing arylene sulfone ether linkages were synthesized from 4,4'-[sulfonylbis ( p-phenyleneoxy)] dibenzoyl chloride (SPCI), 3,3'-[sulfonylbis ( p-phenyleneoxy)] dibenzoyl chloride (SMCI) and various aromatic diamines (ARD), by solution and interfacial polymerization techniques. In solution polymerization, the effect of various acid acceptors such as propylene oxide (PO), lithium hydroxide (LiOH) in the presence of lithium chloride (LiCl), and triethylamine (TEA) on the molecular weight of the polyamides was studied. The effect of structure of various aromatic diamines on molecular weight and thermal properties of polyamides was also studied. The polyamides prepared were characterized by solution viscosity, elemental analysis, thermo-gravimetric analysis, differential scanning calorimetry, and x-ray diffraction. Physical and thermal properties of polyamides prepared from SPCI and ARD were compared with the polyamides prepared from SMCI and ARD.

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Section: Introductionmentioning

confidence: 99%

Polyaramides containing arylene sulfone ether linkages

Idage

Vernekar

1989

J of Applied Polymer Sci

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“…In these reactions, it is possible that naphthoylation of naphthoyl groups in the partially naphthoylated polymers might compete with naphthoylation of styrene units at high extents of naphthoylation. Thus, Lancaster et al reported previously that 2‐naphthoyl chloride could be induced to condense with itself under Friedel–Crafts conditions to form an oligomer having a DP of approximately 6 13. Also, it has been reported that 1,5‐dibenzoylnaphthalene is the major product obtained when benzoylnaphthalene is benzoylated with benzoyl chloride in the presence of aluminum chloride 14.…”

Section: Resultsmentioning

confidence: 98%

Enhancement of the high‐temperature utility of a polystyrene‐b‐poly(ethylene‐co‐butylene)‐b‐polystyrene block copolymer by friedel–crafts naphthoylation

Jones

Wright

Smook

et al. 2003

J of Applied Polymer Sci

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A procedure was developed for the FriedelCrafts naphthoylation of the polystyrene segments of a polystyrene-b-poly(ethylene-co-butene)-b-polystyrene (SEBS) triblock copolymer. It was possible to obtain up to 72% 1-naphthoylation or 100% 2-naphthoylation of the polystyrene segments in the copolymer. Naphthoylation could also be accomplished using trifluoromethanesulfonic acid as a catalyst. The naphthoylated products were characterized by 1 H-NMR spectroscopy, size-exclusion chromatography, and dynamic mechanical thermal analysis. The mechanical properties of the original and naphthoylated polymers were measured from 25 to 125°C. The results obtained indicate that naphthoylation enhances the tensile properties of the polymers at elevated temperatures.

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Preparation and characterization of new polyimides derived from 2,2-bis[4-[2-(4-aminophenoxy)ethoxy]phenyl]sulfone

Liaw

1999

Polym. Adv. Technol.

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A new diamine containing sulfone and oxyethylene unit, 2,2‐bis[4‐[2‐(4‐aminophenoxy)ethoxy]phenyl]sulfone (BAEPS), was used as a monomer with various aromatic tetracarboxylic dianhydrides to synthesize polyimides via a conventional two‐step procedure. The diamine was prepared through the aromatic nucleophilic substitution of bis[4‐(2‐hydroxyethoxy)phenyl]sulfone with p‐fluoronitrobenzene in the presence of potassium carbonate, followed by catalytic reduction with hydrazine monohydrate/Pd–C. Depending on the dianhydrides used, the poly(amic acid)s obtained had inherent viscosities of 0.90–1.32 dl/g. All the poly(amic acid)s were cast from the N,N‐dimethylacetamide solution and thermally converted into transparent, flexible and tough polyimide films. The polyimide films had a tensile strength range of 74–151 MPa and tensile modulus between 1.9 and 3.0 GPa. Almost all the polymers were amorphous except for that derived from dianhydride pyromellitic dianhydride (PMDA). The polyimide derived from 4,4′‐hexafluoro‐isopropylidenediphathalic anhydride exhibited excellent solubility in various organic solvents. These polyimides had moderate glass transition temperatures of between 185 and 222°C. The PMDA‐based polyimide exhibited melting temperature at 413°C. The 10% mass loss temperatures of the polyimides were recorded in the range of 445–468 and 433–452°C in nitrogen and air atmosphere, respectively. Copyright © 1999 John Wiley & Sons, Ltd.

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Thermal degradation of polymers with aromatic rings in the chain

Cited by 38 publications

References 2 publications

Polyaramides containing arylene sulfone ether linkages

Polyaramides containing arylene sulfone ether linkages

Enhancement of the high‐temperature utility of a polystyrene‐b‐poly(ethylene‐co‐butylene)‐b‐polystyrene block copolymer by friedel–crafts naphthoylation

Preparation and characterization of new polyimides derived from 2,2-bis[4-[2-(4-aminophenoxy)ethoxy]phenyl]sulfone

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