Cross-linkable epoxy

Cross-file patent searches, 18 243-244 CrossFire Beilstein, 6 19 Cross-flow filtration, 11 383 15 827, 829 in porous pipes, 11 387-388 with rotating elements, 11 383-387 Cross flow model, 21 706 Cross-flow packed scrubber, 26 687-688 Crossflow plates, 6 762-763 Cross-flow screens, 22 282 Cross-flow velocity, 15 725 Crosshead mandrel, in VDC film extrusion, 25 732-733 Cross-lapping, 17 501 Cross-linkable epoxy thermoplastic system (CET), 10 436... 

Materials. The thermosetting resins investigated include (1) 1,2-dihy-drobenzocyclobutene and maleimide (BCB-MI) resin, (2) a modified version of the BCB—MI resin (BCB-MI-M), (3) cross-linkable epoxy thermoplastic (CET, which is chemically similar to TACTIX 695 epoxy resin from Dow Chemical Co.), and (4) DGEBA epoxy (D.E.R. 332, Dow Chemical Co.) cured with piperidine. The chemical structures of the resins are shown in Chart I. 

Figure 7-3 records the changes of monomer feed and copolymer compositions with conversion in the case of glycidyl methacrylate and styrene. This copoly-merizalion would produce an essentially styrenic polymer which is cross-linkable through the pendant epoxy groups of the methacrylate residues. The last 10% of copolymer formed is practically pure polystyrene. In the styrene-butadiene copolymerization depicted in Fig. 7-4, the product composition is almost constant for the first 70% of the reaction where this polymerization would normally be halted anyway (Section 7.2.3). 

Examples of epoxy rings that are cross-linkable by cationic ring-opening polymerization (XLII)... 

In Chapter 2 we indicated that the formation of a polymer requires that the functionality of the reacting monomer(s) must be at least 2. Where the functionality of one of the monomers is greater than 2, then a cross-linked polymer is formed. Thermosets like phenol-formaldehyde, urea-formaldehyde, and epoxy resins develop their characteristic properties through cross-linking. In this section our discussion is confined to those polymeric systems designed with latent cross-linkability that under appropriate conditions can be activated to produce a polymer with desirable properties. 

Consequently the graph beyond the peak is probably of little relevance, while stopping the instrument earlier and not emptying it extremely quickly could result in very difficult to remove blocks of hard plastic. ASTM D3795 lists head temperatures for eight different materials, including two temperatures for cross-linkable polyethylene, epoxy, and phenolic. Amino plastics are not in the list, although this type of instrument can be used for the.se materials as described by Paul [62]. 

Tan Tanaka, N., lijima, T., Fukuda, W., Tomoi, M. Synthesis and properties of interpenetrating polymer networks composed of epoxy resins and polysulphones with cross-linkable pendant vinylbenzyl groups. Polym. Int. 42 (1997) 95-106. 

Actually, the same reaction leads (at different conditions) to the thermosetting polymer epoxy, in which the ring (which is cross-linkable) is preserved. 

A conventional emulsion polymer based on vinyl acetate has been modified by carboxylation (92). The carboxylated ethylene-vinyl acetate adhesive increases the adhesion to metal and polymer surfaces and the resistance to oil, grease, and water. The films are also acid, alkali, and UV resistant. Furthermore, the polymers are cross-linkable through the carboxylic groups. These adhesives can react with aminoplasts, phenolics, and epoxy resins for increased water and creep resistance. 

Polyvinyl alcohol is copolymerized with cross-linkable comonomers N-methylol acrylamide is self-curing. Carboxylic acid comonomers are cured by epoxy, urea, or phenolic resins. 

Fig. 2.24 A side-chain NLO type I co-polymer containing epoxy cross-linkable moiety in the co-monomeric unit [96]...

Figure 26.7 shows the chemical structures of an NLO chromophore (APAN) and an epoxy-based polymer (BPAZO) where NLO moieties are attached to the backbone [81]. Both the dye and the polymer are functionalized with thermally cross-linkable acryioyl groups. As the dye-doped polymer is subjected to heat as part of the simultaneous poling/curing process, the inter- and intramolecular cross-linking reactions occur simultaneously (Fig. 26.8). The 7g of the cross-linked polymer-dye network is lower than that of the undoped polymer network because of the plasticizing effect of the dissolved dye. However, the temporal stability at 100°C of the polymer-dye network is better than that of the undoped polymer network (Fig. 26.9) as a direct result of the increased cross-linking density in the cross-linked guest-host system. Therefore, the addition of the thermally cross-linkable NLO dye not only increases the...

This explains that adhesives suppliers first developed in the seventies the so-called toughened epoxies, flexibilized by addition of a small amount of cross-linkable rubber, and then recently the company SIKA pioneered the so-called flexible structural bonding in which they use PU adhesives derived from their experience in PU sealants, to get semi-structural bonds, for instance, for transportation and automotive or naval uses. 

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