Glass/polyether imide

Ruvola-Filho and Teixeira [6] observed a shifting of the a-transition in amorphous glass polyether imide films at higher temperatures around the glass transition temperature by using DMTA. These are due to the antiplasticiser effects of dichloromethane solvent on the elastic modulus of the polyether imide matrix. 

Polyether-imide, 10% glass Polyether-imide, 20% mineral Poly ether sulfone, 30% glass Polyphenylene sulfide, 30% glass Polyphenylene sulfide, glass/ mineral... 

Boric acid in conjunction with APP was reported in epoxy intumescent coating.30-31 Boric acid and its derivatives were used in phenolics to impart thermal stability and tire retardancy. For example, Nisshin steel claims the use of boric acid and aluminum trihydroxide (ATH) in phenolics for sandwich panel.32 It was also reported that the small amounts of boric acid (around 0.25% by weight) in polyether imide (PEI) and glass-filled and PEI can reduce peak HRR by almost 50% in the OSU Heat Release test for the aircraft industry.33 In applications where high modulus and high strengths are needed, boric acid can be added without the softening effects of other additives such as siloxanes. 

Copolyester of p-hydroxybenzoic acid with ethylene terephthalate (PHB-PET, 60/40) was supplied by Tennessee Eastman Kodak Co., whereas polyether imide (PEI) was provided by General Electric. Co. (Ultem 1000). These polymers were dissolved together in a mixed solvent of phenol and tetrachloroethane in the ratio of 60/40 by weight at 80°C for about a week. The polymer concentration of the solution was 2 wt7.. Various PHB-PET/PEI films were cast on glass slides at ambient temperature, then dried in a vacuum oven at 60°C for two weeks. Thicker films were prepared in Petri dishes for differential scanning calorimetric (DSC) studies. 

Schulte [46,47] has demonstrated how different organic solvents, such as hydraulic fluid encountered in the aerospace stmctures, lead to a reduction in the secant modulus of 45° glass fibre laminate under flexural fatigue and the number of cycles to failure. The matrix in this case was a polyether imide (PEI) which is plasticised by ingress of the fluid. A reduction in the matrix modulus means that the shear strength of the matrix will also be reduced with the consequence that the failure mechanism in flexure will change from matrix-fracture to delamination. 

Figure 13.4 Cross-sections of 4.5-mm-thick glass Hbre-reinforced polyether imide panels following air-blast testing [24]. (a) Impulse = 7.9 N s, (b) impulse = 8.0 N s, (c) impulse = 9.0 N s, (d) impulse = 9.4 N s.

Figure 13.5 The variation of the length of fibre fracture with impulse for 2.2-, 4.2- and 6.2-mm-thick CF/PEI plates (laminates A to C, respectively) and a 4.5-mm-thick GF/PEI plate (laminate F) [24]. CF, carhon fibre GF, glass fibre PEI, polyether imide.

Miscibility of segmented rigid-rod polyimide (PI), viz., biphenyl dianhydride perfluoromethylbenzidine (BPDA-PFMB), and flexible polyether imide (PEI) molecular composites was established by differential scanning calorimetry. The composite films of BPDA-PFMB/PEI were drawn at elevated temperatures above their glass transitions. Tensile moduli of the films were evaluated as a function of composition and draw ratio. Molecular orientations of polyimide were determined by birefringence and wide-angle X-ray diffraction. The crystal orientation behavior of the 80/20 BPDA-PFMB/PEI was analyzed in the framework of the affine deformation model. 

Property Polysul- phone Udel Poly ether sulphone Victrex Poly- phenylene sulphide Ryton Polyether- imide Ultem Ultem +20% glass reinforced... 

Virgin and recycled polyethylene terephthalate (PET) was blended with polyether-imide (PEI) in proportions between 0 and 50 percent PEI content and samples were examined by differential scaiming calorimetry and Fourier transform infrared spectroscopy. All blends were completely miscible, as indicated by a single glass transition temperature which is dependent on blend composition. Crystallisation rates of PET were retarded strongly at 20 percent PEI content and above, but degree of crystallinity was easily determined from a linear correlation between a structural parameter measured spectroscopically and enthalpy of fusion. Trans conformer activation energy measurement confirmed the effects of PEI content on crystallisation of PET. 9 refs. 

Polymer Specimens. The materials used in this work were polyimide (PI),polyamide-imide (PAl), polyether-ether-ketone (PEEK), polyphenylene sulfide (PPS) and polyether sulphone (PES). The chemical formulas and physical properties of the specimen polymers are summarized in Table I. The specimen polymers, except PPS, were unfilled while the PPS specimen was filled with glass fiber of Uo wt. %. PAI and PES are amorphous polymer with considerably high glass temperature. The polymers, except PI, can flow at hi temperatures and allow the use of injection molding. 

Polyaraide-imide Polyaraide-imide Polyether fluoroethylene Polyether fluoroethylene Polyether fluoroethylene Polyethylene-tetrafluoroethylene Glass fiber Graphite 60% bronze 15% and 25% glass fiber 15% graphite 30% carbon fiber... 

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