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A novel bismaleimide (BMI), bis(4-maleimidophenoxy-3,5-dimethylphenyl)dicyclopentadiene (DCPDBMI), containing a large dicyclopentadiene (DCPD) and aryl ether linkage, was synthesized from bis(4-aminophenoxy-3,5-dimethylphenyl)dicyclopentadiene and maleic anhydride by the usual two-step procedure that included ring-opening addition to give bismaleamic acid, followed by cyclodehydration to bismaleimide...
Two novel tetramethyl stilbene-based novolac (II and IV) were synthesized from 2,6-dimethyl phenol and chloroacetaldehyde dimethylacetal or chloroacetone, and then the resulted novolacs were epoxidized to tetramethyl stilbene-based epoxy resins (III and V). The proposed structures were confirmed by FTIR, elemental analysis, mass spectra, NMR spectra and epoxy equivalent weight titration. The synthesized...
Dissolution and reprocessing of exfoliated montmorillonite-nylon 6 (NLS) nanocomposite is demonstrated, illustrating the potential of using polymer nanocomposites as the foundation for fabricating nano- and mesoscopic structures, nanofibers in this case, and thus exerting hierarchical control of morphology and form through the combination of a nanostructured material and a nanoscale fabrication technique...
Several series of copolyimides were synthesized from various ratios of two diamines with aromatic tetracarboxylic dianhydrides through thermal imidization process to determine the effect of naphthalene ring on the physical properties of polymers. The copolyimides were characterized using inherent viscosity, differential scanning calorimetry (DSC), TGA, DMA, TMA and dielectric analyzer. DSC showed...
Novel flame-retardant curing agents for epoxy resins, [ODOPM–PN] and [ODOPM–MPN], were prepared from phenol formaldehyde novolac (PN), melamine-phenol formaldehyde novolac (MPN) and a reactive 2-(6-oxid-6H-dibenz〈c,e〉 〈1,2〉oxaphosphorin-6-yl)-methanol (ODOPM) while ODOPM was synthesized through the reaction between 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and formaldehyde. The compounds...
Organic light-emitting diodes (OLEDs) have been developed recently, however, the efficiency of electroluminescent devices needs to be further improved. In this study, the electron-transporting chromophores were introduced into an emission polymer to increase its electron affinity. Several phosphorus-containing emission chromophores were synthesized and incorporated with electron-transporting chromophores...
Curing kinetics of glycidyl ether of cresol formaldehyde novolac or novel phosphorus-containing epoxy cured with diaminodiphenyl sulfone (DDS) were studied by the dynamic differential scanning calorimetry (DSC) and isothermal DSC method. Parameters of dynamic curing kinetic were calculated by using the Kissinger and Ozawa's methods, respectively. Parameters including k1, k2, m and n of isothermal...
A series of novel polyimides containing naphthalene pendant moieties were prepared from various diamines (including bis(4-amino-3,5-dimethylphenyl)naphthylmethane 1, bis(4-aminophenoxy-3,5-dimethylphenyl)naphthylmethane 4, and bis(4-aminophenoxy-3,5-dimethylphenyl)methane 5) with various aromatic tetracarboxylic dianhydrides via both two-step and one-step methods. All polyimides, except 8 5 ...
Blends of a novel phosphorus containing PEN copolyester (PENP2) and poly(butylene naphthalate) (PBN) have been studied before and after transesterification. According to DSC results, the physical blend exhibits complete miscibility when the content of PBN is less than 40% or higher than 90% by weight and exhibits partial miscibility outside these ranges. Transesterified blends were obtained by holding...
A series of novel polyimides have been synthesized from the condensation of 5-(perfluorononenyloxy)isophthalic acid bis(4-aminophenyl) ester (IV 3 ) with various aromatic tetracarboxylic dianhydrides. For comparison, the polyimides containing the bis(4-aminophenyl) ester unit were prepared from terephthalic acid bis(4-aminophenyl) ester (IV 1 ) and isophthalic acid bis(4-aminophenyl)...
2-(6-Oxid-6H-dibenz〈c,e〉 〈1,2〉oxa-phosphorin-6-yl)1,4-benzenediol (ODOPB) was prepared by the addition reaction between 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and p-benzoquinone while DOPO was synthesized through multistep reaction from o-phenylphenol and phosphorus trichloride. The compound (ODOPB) was used as a reactive flame-retardant in o-cresol formaldehyde novolac epoxy resin...
Novel bismaleimide (BMI) and epoxy resin with naphthalene side group were synthesized from the intermediates bis(4-amino-3,5- dimethylphenyl)naphthylmethane (BADN) and bis(4-hydroxy-3,5- dimethylphenyl)naphthylmethane (BHDN) which were obtained from the reactions between 1-naphthaldehyde and 2,6-dimethylaniline or 2,6- dimethylphenol, respectively. The monomers were characterized by Fourier transform...
A series of novel perfluorononenyloxy group containing aromatic polyamides were synthesized by direct polycondensation of 5-(perfluorononenyloxy)isophthalic acid (I) with various aromatic diamines in N-methyl-2-pyrrolidone (NMP) containing lithium chloride. In this process, triphenyl phosphite and pyridine were used as condensing agents. All the aromatic polyamides were amorphous and readily soluble...
The modification of novel trifunctional epoxy resins with silicon rubber to reduce stress while maintaining a high glass transition temperature is described. Trifunctional epoxy resins were synthesized from the condensation of 4-hydroxybenzaldehyde, chloroacetaldehyde or crotonaldehyde with phenol, followed by epoxidation with a halohydrin. The structure of the synthesized triphenols was characterized...
A stable dispersion of polysiloxane thermoplastic polyurethane (TPU) particles in an epoxy resin matrix was achieved via epoxy ring opening with the isocyanate groups of urethane prepolymer to form an oxazolidone. The effects of the structure and molecular weight of the polysiloxane TPU in reducing the stress of electronic encapsulants were investigated. The mechanical and dynamic viscoelastic properties...
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