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Resole cure

Helmut Orth first reported the use of laetones to accelerate phenolic resole cure in 1957 [161]. A year later, Orth discovered that this effect could be extended to aliphatic esters as well [162], Despite the dramatic nature of the acceleration seen, Orth s observations were not applied in industry for a decade. In 1967, Sumitomo and BASF applied esters to soil grouting and wood uses [133,163, 164]. Neither of these applications were commercially successful, however, and commercial success would not occur until 1980 when Borden introduced ester-cured sand binders for foundry [165]. This technology was highly successful in UK and spread to the US, where it was applied immediately to foundry in 1981 and eventually to wood products in 1990 [119,166-173]. Esters are capable of reducing the gel times of resoles from several weeks to less than 30 s at room temperature. Both gaseous and liquid esters are applicable [119,166]. [Pg.916]

The kinetics of resole cure reactions monitored via FTIR suggest that a diffusion mechanism dominates below 140°C. The cure above 140°C exhibits a homogeneous first-order reaction rate. The activation energy of the cure reaction was -"-49.6 kJ/mole.66... [Pg.408]

The phenolic resol curing reaction and dimethacrylate polymerization were conducted at 170°C for 90 minutes, yielding vinyl compound/phenolic IPN. (See Scheme 3.)... [Pg.432]

Properties of vinyl compound/phenolic IPN were discussed and the following conclusions drawn. MMA radical polymerization proceeded rapidly in the presence of phenolic resol. Poly (ethylene glycol) dimethacrylate, 23G, and phenolic resol IPNs were synthesized by simultaneous radical polymerization and phenolic resol curing reaction. These IPNs had a structure of poly 23G chains and cured phenolic resol chains so well entangled with each other that the whole acted as a single phase. This type of IPN is considered to... [Pg.443]

The composites based on the PFO resols cured ester type (UP-632, XXIV) and cychc acetal type (UP-612, XXVI) CECs exhibit higher mechanical strength and heat resistance in comparison with similar materials cured with dicarboxylic acid anhydrides [86]. [Pg.108]

As resoles cure simply by heat activation, no hardener components need to be added to the formulation, which will cure in the region of 140 to 150 °C in 30 to 60 min resoles are stUl active, albeit to a low degree, at ambient temperatures. Simple acceleration of cure cau be achieved by... [Pg.320]

As indicated in Section 12.4.4, casting resins have a resol-type structure but contain a greater proportion of methylol groups. It may therefore be anticipated (cf.. Section 12.5.1) that an appreciable number of ether links are produced when a casting resin is cured. Further, since castings are normally cured at relatively low temperatures these ether links are likely to persist in the final product. It may be noted that it is possible to prepare castings which are colourless, whereas resols cured at about 150°C are dark coloured. This observation is in accordance with the suggestion that it is the thermal decomposition of ether links into quinone methides which leads to colour formation in cured resols. [Pg.297]


See other pages where Resole cure is mentioned: [Pg.301]    [Pg.912]    [Pg.953]    [Pg.409]    [Pg.692]    [Pg.437]    [Pg.107]    [Pg.22]    [Pg.57]    [Pg.912]    [Pg.982]    [Pg.196]    [Pg.88]    [Pg.2755]    [Pg.933]   
See also in sourсe #XX -- [ Pg.912 ]

See also in sourсe #XX -- [ Pg.912 ]




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