Untitled

Hawthorne, D. G.; Hodgkin, J. H.; Morton, T C

doi:10.1088/0954-0083/11/1/002

Cited by 15 publications

(15 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, Connell et al [23] reveal that the presence of TAP in PETI-oligomers yielded laminates with high 7DEOH 7KHUPDO SURSHUWLHV RI 3(7,%'$) ROLJRPHUV void content most likely derived from moisture generated from residual TAP and PEPA at the elevated temperature cure. Despite these findings, the measured GPC molecular weights (P O 4577, P X 9660 and PD 2.11) and inherent viscosity 0.20 dl g 4 of CTMPEI-5.5K are not as low as might be expected based on the Hawthorne et al study [32].…”

Section: 46-triaminopyrmidine (Tap) Modification Of Peti-55kcontrasting

confidence: 57%

“…However the low viscosity of the CTMPEI-5.5 oligomer may be attributed to unreacted PEPA and to a lower molecular weight oligomer than the calculated P O 5.5K due to the low reactivity of the amino groups in TAP. It has been shown [32] that aza-heterocyclic di or triamines such as 2,4,6-triaminopyrimidine (TAP) exhibit low reactivity due to the deactivating effect of the aza group in the aromatic ring structure. Furthermore, Connell et al [23] reveal that the presence of TAP in PETI-oligomers yielded laminates with high 7DEOH 7KHUPDO SURSHUWLHV RI 3(7,%'$) ROLJRPHUV void content most likely derived from moisture generated from residual TAP and PEPA at the elevated temperature cure.…”

Section: 46-triaminopyrmidine (Tap) Modification Of Peti-55kmentioning

confidence: 99%

See 1 more Smart Citation

Modification of PETI-5K Imide Oligomers: Effect on Viscosity

Simone

Scola

2003

High Performance Polymers

View full text Add to dashboard Cite

A phenylethynyl (PE) end-capped oligoimide of number average molecular weight ? 5000, known as PETI-5K was modified by: (1) varying molecular weight; (2) addition of phenylethynyl (PE) end-capped reactive diluents to PETI oligomides; (3) incorporation of 1,4-cyclohexanyl diamine with PETI-5K diamines; (4) incorporation of 2,4,5-triaminopyrimidine with PETI-5K; and (5) replacement of the PETI-5 diamines, 3,4 -ODA and APB with 2,2 -bis [4-(4-amino-phenoxy) phenyl] hexafluoropropane (4-BDAF) to determine the effects on glass transition temperature and minimum melt viscosity. All approaches caused a reduction in complex minimum melt viscosity, but the minimum melt temperatures were only sufficiently low enough for the material to have melt stability for a hot-melt coating application in methods ( 2), (4), and (5). The reduction in the complex minimum melt viscosity of oligomer prepared by method (4) may be due to unreacted monomers and a lower oligomer molecular weight, ?, than calculated.

show abstract

Section: 46-triaminopyrmidine (Tap) Modification Of Peti-55kcontrasting

confidence: 57%

Section: 46-triaminopyrmidine (Tap) Modification Of Peti-55kmentioning

confidence: 99%

Modification of PETI-5K Imide Oligomers: Effect on Viscosity

Simone

Scola

2003

High Performance Polymers

View full text Add to dashboard Cite

show abstract

“…The values of T g of the PI/AFG hybrid films decreased with increasing contents of crosslinker. It has been reported by Hawthorne and Hodgkin that copolyimides incorporating triamine monomer were found to have lower molecular weights . Thus, with an increasing in the contents of TAP and melamine crosslinkers, the molecular weights would be decreased.…”

Section: Resultsmentioning

confidence: 99%

“…It has been reported by Hawthorne and Hodgkin that copolyimides incorporating triamine monomer were found to have lower molecular weights. 45 Thus, with an increasing in the contents of TAP and melamine crosslinkers, the molecular weights would be decreased. The lower molecular weights promote segmental motion at lower temperatures and lead to the lower T g values.…”

Section: Optical Propertiesmentioning

confidence: 99%

Effects of crosslinking agents on the physical properties of polyimide/amino‐functionalized graphene oxide hybrid films

Jeong

Yoo

Lee

et al. 2018

Polymer International

View full text Add to dashboard Cite

The effects of crosslinking agents (crosslinkers) on polyimide (PI)/graphene oxide (GO) hybrid films were extensively investigated. The surface of GO was modified with amino groups using 4‐aminobenzylamine to improve compatibility with pyromellitic dianhydride/4,4′‐oxydianiline PI, and two kinds of crosslinkers were used: tris(4‐aminophenyl)amine and 1,3,5‐triazine‐2,4,6‐triamine (melamine). The mechanical, thermal and optical properties of the PI hybrid films were investigated. In particular, the transparency and physical properties of the PI hybrid films containing amino‐functionalized GO with homogeneous dispersion were improved. As the content of the crosslinker increased, a crosslinking network was formed between the PI chains, and the stiffness of the hybrid films was increased. The glass transition temperature, heat resistance and mechanical properties were also enhanced. The PI hybrids prepared with a rigid crosslinker exhibited higher optical transparency due to the reduction of the intermolecular charge transfer interactions with increasing interchain spacing between the PI chains. © 2018 Society of Chemical Industry

show abstract

“…Two particular areas where performance increases are continually required are thermal stability and dielectric properties. Epoxy matrices have traditionally fulfilled most requirements1–3; however, the increased demands have seen researchers look to alternative materials such as cyanate esters,1, 4, 5 melamines,6, 7 and vinyl functionalized polyaromatics (ethynyl8, 9 and parylene resins10, 11). One potential route to overcome performance issues is the creation of new thermosetting resins.…”

Section: Introductionmentioning

confidence: 99%

The synthesis of novel aliphatic bis(acenaphthelene) reactive monomers

Wooster

Abrol

Hey

et al. 2005

J. Polym. Sci. A Polym. Chem.

View full text Add to dashboard Cite

Novel aliphatic-bridged bis(acenaphthalene)s are synthesized and evaluated as potential precursors to high-temperature reactive monomers. It was found that as the length of the aliphatic bridging unit increased, the thermal stability of bis(acenaphthalene) increased and melting point decreased. The use of an alternative route for the introduction of the reactive vinyl group resulted in a dramatic increase in monomer purity. The increase in monomer purity resulted in the creation of a processing window that enabled samples to be melt cast prior to polymerization, greatly improving their suitability as high-temperature polymers. Polymerized samples were found to have high thermal stability, indicating they have potential as high temperature materials. V V C 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 5072-5082, 2005

show abstract

Untitled

Cited by 15 publications

References 6 publications

Modification of PETI-5K Imide Oligomers: Effect on Viscosity

Modification of PETI-5K Imide Oligomers: Effect on Viscosity

Effects of crosslinking agents on the physical properties of polyimide/amino‐functionalized graphene oxide hybrid films

The synthesis of novel aliphatic bis(acenaphthelene) reactive monomers

Contact Info

Product

Resources

About