Polyaryl methacrylate

They are atactic amorphous polymers which have good light transparency (92%) and yield transparent moldings and films. As was noted for polyalkyl acrylates, the solubility parameters decrease as the size of the alkyl groups increases. The flexibility also increases as one goes from polymethyl methacrylate (PMMA) to polyaryl methacrylate and then decreases as the size of the alkyl group is further increased. 

Kanemitsu and Einami (1990) investigated the role of the polymer on hole transport in a series of 2-(p-dipropylaminophenyl)-4-(p-dimethylaminophenyl)-5-(o-chlorophenyl)-l,3-oxazole (OX) doped polymers. The polymers were a polyarylate (PA), bisphenol-A polycarbonate (PC), poly(methyl methacrylate) (PMMA), poly(styrene) PS, poly(vinyl chloride) (PVC), polyethylene terephthalate) (PET), and poly(vinyl butyral) (PVB). The glass transition temperatures of the polymers range from 322 (PVB) to 448 K (PA). The temporal features of the photocurrent transients were strongly dependent on the polymer. Figure 76 shows the results. The field was 4.0 x H)5 V/cm and the temperature 295 K. The transients were near rectangular for PS, PET, PA, and PMMA, and highly dispersive for PVC land PVB. This was attributed to the fact... 

For the proposed technique community verification, namely, the equation (29), the authors [24] used the literary data for polymer-solvent 16 pairs in reference to polymers of different kinds polyearbonate (PC), poly(methyl methacrylate) (PMMA), poly(vinyl ehloride) (PVC), polydimethylsiloxane (PDMS), polyarylate (PAr) and polystirene (PS) [5, 17, 18, 20]. The solubility parameters 6 of the indieated polymers is accepted according to the data [16, 32]. The eomparison of ealeulated according to the Eqs. (4) and (29) Devalues for these polymer-solvent pairs... 

For kH calculation the authors [10] supposed that all the used in work polymers (polyarylates (PAr), poly(vinyl chloride) (PVC), poly(methyl methacrylate) (PMMA), polysulfone (PSF) and polycarbonate (PC)) had the same molecular weight MM = 5 x 105. 

Nickel sulfamate electronics components Polyarylate resin electronics industry Dihydroterpineol electronics ingredient Urethane di methacrylate electrophilic reagent... 

More recently, a polyarylate-polyamide blend with improved chemical, stress-crack resistance is commercially offered (AX1500, Unitika). Due to the inherent immiscibUity of polyarylate with polyamide, the blend is opacpie and the notched Izod impact is somewhat sacrificed (Table 19.36). Compatibihty in polyarylate-PA6 blends could be achieved through addition of < 10 % of a reactive ethylene copolymer such as ethylene-glycidyl methacrylate copolymer (Okamoto et al. 1989). 

Fig. 20 Apparent activation energy of glass transition (a-relaxation) vs activation energy of p-relaxation dependence obtained at 10-2-1 Hz obtained by DSC or DMA techniques for polymers (1) polyisoprene (2) poly(dimethylsiloxane) (3) polyethylene (4) polypropylene (5) polyamide-6 (6) poly(ethylene terephthalate) (7) poly(vinyl acetate) (8) poly(vinyl chloride) (9) poly(vinyl alcohol) (10) poly(methyl methacrylate) (11) boron oxide glass (12) polyacrylonitrile (13) polycarbonate (14) poly(cyclohexyl methacrylate) (15) poly(a-methylstyrene) (16) polystyrene (17) polyarylate (18) polyimide I (19) polyimide II (20) polyimide III (21) poly(m-phenylene isoph-thalamide)...

The authors of Ref. [21] supposed, that in orientational drawing process of poly(metyl methacrylate) (PMMA) the following structure changes occur the transition to more equilibrium structure owing to molecular package improvement and internal stresses relaxation. The quantitative structural model absence not allows the authors of Ref [21] to give direct proofs of their suppositions. In Ref [22] such treatment was fulfilled on the example of extruded amorphous polyarylates DV and DF-10 with the cluster model of polymers amorphous state structure using [12, 23],... 

DPC has in recent years been applied to studies on a range of photopolymers including DF 2000 photopolymer [6], cinnamonyl methacrylate-glycidyl methacrylate copolymer [7], multiethylene glycol dimethacrylate [8], Ebecryl 270 (aliphatic urethane diacrylate [8], 1,6-hexanediol diacrylate and 2-hydroxy-2 methyl phenyl propane-l-one (Darocure 1173) [2], epoxy acrylates [9], epoxy vinyl ether formulations [10], polyarylates, maleimides and vinyl ethers [11], hydroxylated polyimides [12], polystyrene-poly-w-butyl acrylate copolymers [13], and 3,3,5-trimethylcyclohexane-l-phenol adducts [1]. 

Only a handful of polymers seemed viable candidates fluorocarbons such as poly(tetrafluoroethylene) (PTFE), polyesters such as poly(ethylene terephthalate) (PET), aromatic polycarbonates (PC), and polyarylates such as resorcinol polyary-late (RPA). Poly (methyl methacrylate) (PMMA) would be an attractive candidate, but its heat distortion temperature is less than the maximum service temperature. PTFE was already established as a PV front sheet material in flexible amorphous silicon modules. We observed that in flat roof applications, these modules sometimes developed corrosion spots due to cuts and punctures through the thin, soft PTFE. We desired a lower cost and mechanically more robust front film. 

In another example, polyarylate (PAR) end-capped by a COOH group was melt reacted with a random terpolymer of ethylene, ethyl acrylate and glycidyl methacrylate (E-EA-GMA), the extent of the interfacial reaction being controlled by the addition of various amounts of stearic acid that consumed part of the epoxy groups. The minor phase (E-EA-GMA) was first compounded, and the phase inversion that occurred upon the addition of the major phase (PAR) was delayed as less stearic acid was added [73]. 

The interfacial chemical reaction changes the dynamics of the phase inversion process. Sundaiaraj et al. [25] systematically studied the phase inversion process in a reactive polyarylate/ethylene-ethyl acrylate-glycidyl methacrylate rubber blend where the extent of interfacial chemical reaction was controlled by the addition of stearic acid. The primary effects of the interfacial reaction were to delay phase inversion and increase the mixing torque rise associated with it. Figure 5.6 illustrates both of these points. They attributed these effects to the fact that in reactive blends steric stabilization of the... 

The effect of the amorphous component on the crystallization ability of the crystallizable polymer has been examined for some miscible blends. An improvement of poly( -caprolactone) (PCL) crystallization has been observed in blends with chlorinated polyethylene (CPE) [20], while for poly(ethylene oxide)/poly(ethyl methacrylate) (PEO/PEMA) [21], PCL/SAN [22], and poly(butylene therephthalate)/polyarylate (PBT/ PAr) [23] blends, the crystallization ability is markedly reduced. 

---