Glass-reinforced plastics based on matrices combining thermoplastics and thermosetting plastics

Abstract

One of the most interesting research trends is the creation of composites based on matrices which are mutually penetrating networks of thermoplastics and thermosetting plastics. The properties of unidirectionally glass-reinforced plastics based on polysulfone combined with polyepoxide and Rolivsan resin in different ratios were examined. Polysulfone is a typical thermoplastic for which significant plastic strains, high specific fracture viscosity, and crack and impact resistance are characteristic. The epoxy oligomers are the most common thermosetting binders used for fabrication of reinforced plastics. They are easy to manufacture and ensure a high degree of realization of the strength of the fibers. In addition to the advantages of epoxy resins, Rolivsans, which consist of a mixture of divinyl aromatic oligomers, also have very high heat resistance after cross-linking by a polymerization--polycondensadon mechanism at a temperature above 200~ [I].Chemical reaction of polysulfone with thermosetting plastics is not very probable due to its inertness. At the same time, when the components are carefully mixed afar the thermosetting plastic is cured, a slx~acture of the "snake in a cage" type forms, where the thermoplastic is mechanically bound and removed with difficulty even in extraction.Binders with a wide range of ratios of polysulfone PSF-ISO and thermosetting oligomer (]~D-20 epoxy--bisphenol A with triethanolamine titanate (TEAT) curing agent or MV-I Rolivsan) were used in the form of solutions in a common solvent, chloroform. The viscosity of the solutions was approximately the same. Their concentration varied: for example, a 15% solution of polysulfone had the same viscosity as an 80% solution of ]~D-20 or Rolivsan (approximately 20 sec with a VZ-4 viscometer).The samples of glass-reinforced plastics were fabricated by winding RVM-420-78 glass roving. The main problem here was to remove the solvent from the surface layer of the material as completely as poss~le immediately after its structure formed, since the polysulfone film formed prevents departure of chloroform from the inner layers. The winding rate was decreased to 2 m/min for this purpose; the formation zone with phene was blown through with hot air (200-250~ a stitcher was used; before curing of the binder, the samples were held for 12 h at 80-90~ In addition, samples with a high concentration of polysulfone were wound with aramid fiber,which created significant thermocompressive pressure during the

Modification of epoxy resin by polysulfone to improve the interfacial and mechanical properties in glass fibre composites. I. Study of processes during matrix/glass fibre interface formation

“…[20]. Curing was carried out at 180 ± C for 6 h. Curing regime was chosen earlier as providing optimal properties of the cured blends [21].…”

Thermal and thermomechanical properties of rolivsan unsaturated resins co‐cured with bisphenol A dicyanate

“…20 ROLs find applications as thermostable non-porous impregnating compounds (clear castings), sealing compounds, vacuum-dense glues, protective coatings, and binders for composites. 6,[9][10][11][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] The following polyfunctional compounds were studied as target additives (admixtures inactive in TFRP): epoxy resins, 10,11,[37][38][39][40][41][42][43] aromatic diamines, [44][45][46][47] aromatic tetra-amines and dianhydrides of aromatic tetracarbon acids. 48 Chemical modification with these compounds improved thermal, strength and adhesive properties of the cured ROLs.…”

“…Non-catalyzed neat ROLs are rapidly cured at elevated temperatures 6,[9][10][11][12]16,[18][19][20][21][22][23][24][25][26][27][28][29][30]35,[42][43][44][45][46][47][48] or in the presence of acidic catalysts, 6,25 maleic anhydride, 36 bismaleimides, 36 etc. At 140-170 С, unsaturated aromatic ethers and esters incorporated into ROLs undergo threedimensional radical polymerization (TFRP) and yield a densely cross-linked glassy copolymer with a primary polymer network.…”

“…According to the results of earlier studies, the cured ROLs have high thermo‐oxidative stability (250–320°С) and good dielectric properties, which are resistant to hot strong acids and alkalis 20 . ROLs find applications as thermostable non‐porous impregnating compounds (clear castings), sealing compounds, vacuum‐dense glues, protective coatings, and binders for composites 6,9–11,21–36 …”