Synthesis, structure and properties of poly[bis‐(4‐vinylphenyl) ether]

Abstract

Bis-(Cvinylphenyl) ether (BVPhE) was obtained by the polycondensation of bis-[4-(l-hydroxyethyl)phenyl] ether and subsequent dehydration of the resulting polyether. T.he kinetics of three-dimensional polymerization of BVPhE in an inert medium and in the presence of air have been investigated by I R spectroscopy and differential scanning calorimetry. It is shown that poly-BVPhE is a highly crosslinked glassy polymer exhibiting high thermal stability and having a softening point of m 460OC. Synthese, Struktur und Eigenschuften von Poly [bis-(4-vinylphenyl) -ether]ether und nachfolgende Dehydrierung des erhaltenen Polyethers hergestellt. Die Kinetik der dreidimensionalen Polymerisation von BVPhE wurde in einem inerten Medium sowie in Luft mittels IR-Spektroskopie und DSC untersucht. Es wird gezeigt, da8 Poly-RVPhE ein hochvernetztes glasiges Polymer mit hoher thermischer Stabilitat und einem Erweichungspunkt von etwa 46OoC ist. Cunmea, c m p p m y p a u ceoiicmsa nonu o'uc(4-su~u~cg6en~oeoso) a&pa a@npa n nocnegymqe8 RernzpaTaqmi 06pa3ymqeroc~ npn BTOM npocToro n o n~a @~p a . MeTOAaMEi EIK-cnempocKo-E;HC(4-BHHHJI@eHIIJIOBhI8) 3@Hp (BBQ3) nOJIyWH IIOCpeRCTBOM IfOJIHKOHAeHCa~MIl 6nC[4-( 1-OKCE13TEIJI)@?HIIJIOBOI'O] nHII II AH@@epeHI(HaJIbHOfi CKaHHpyH)uea KaJIOPHMeTPHH HCCaeAOBaHa KUHeTEIKa TpeXMepHOa nOJIIIMepH3aqHki BBQ3 B ElHePTHOfi CpeAe II B IIPIICYTCTBHII BO3AyXa. nOKaSaH0, YTO n o n~f -~B @ 3IIpeRCTaBJIfIeT c0608 ryCT0CeT-llaThIfi CTeKJIOO6pa3HbI8 nOJIHMeP, IIMeIoJJ.@ BbICOKYH) TePMOCTO8KOCTb EI TeMIlepaTypy pa3MfIrYCHIIFi N 460°C.

Proximity effect and electron transport in oxide hybrid heterostructures with superconducting/magnetic interfaces

“…The superconducting current (I C ) is clearly observed at T The I c (T) curves follow the temperature dependence of the Nb superconducting gap similar to MHS without M-interlayer [10,21]. Note, such behavior also follows from calculations [8] of long-range proximity effect in M-interlayer. However, we did not observe neither any noticeable change of The values of the second harmonics of the CPR were defined from measurements of Shapiro steps, which arise on the I-V curves irradiated by microwaves at experimental frequencies 36-120 GHz.…”

“…where , For boundary conditions , we obtain the relationship for the condensate function at different edges of the M-layer : in that case [8,[41][42][43][44]. interlayer), we evaluate the value of the Fermi momentum p F =hk F , p F ≅1.6 10 -27 kg m/s taking k F l~1 [10].…”

“…Theoretical investigation of a S/M/S structure with M-interlayer composed of F-layers each one with a thickness significantly exceeding the atomic-scale (magnetic multilayer structure, MMS) was carried out in the work [8] The orientation of the F-layers in MMS-model was parallel to the S/M interface. It was shown that for AF-ordering of the magnetizations in the M-structure the significant dependence of the proximity effect will take place and amplitude of Josephson current depends on N number of layers.…”

Properties and toughening of heat‐resistant thermosets based on unsaturated ester resins

“…For example, the curing kinetics of pure bis (4-vinylphenyl) ether monomer (M1) was reported. 10 In addition, preparative scale gel permeation chromatography (GPC) was employed to isolate the asymmetrically substituted monomer (M2) and its thermal polymerization was monitored by IR spectroscopy and calorimetry.…”

“…Although most of the reported work involved complex resin mixtures, some of the pure compounds were isolated and their curing behavior was studied independently. For example, the curing kinetics of pure bis(4‐vinylphenyl) ether monomer ( M1 ) was reported 10. In addition, preparative scale gel permeation chromatography (GPC) was employed to isolate the asymmetrically substituted monomer ( M2 ) and its thermal polymerization was monitored by IR spectroscopy and calorimetry 3…”