Polymerization 1,6-hexanediol diacrylate

Devaky and Rajasree have reported the production of a polymer-bound ethylenediamine-borane reagent (63) (Fig. 41) for use as a reducing agent for the reduction of aldehydes.87 The polymeric reagent was derived from a Merrifield resin and a 1,6-hexanediol diacrylate-cross-linked polystyrene resin (HDODA-PS). The borane reagent was incorporated in the polymer support by complexation with sodium borohydride. When this reducing agent was used in the competitive reduction of a 1 1 molar mixture of benzaldehyde and acetophenone, benzaldehyde was found to be selectively reduced to benzyl alcohol. 

To demonstrate the UV crosslinkability of the polymers formed having pendant acyloxyimino groups, copolymers of bisphenol diacrylate and 1,6 hexanediol diacrylate were prepared by thermal methods with 5% (by weight) of pyrene oxime acrylate and phenanthrene oxime acrylate, both of which have considerable absorption in the region of 320-360 nm. The polymerization was stopped before the gel point and the prepolymer solutions were then irradiated with light from a monochromator at the maximum of... 

Affinito [2] vapor coated hexanediol diacrylate, trimethylolpropane triacrylate, and tripropyleneglycol diacrylate hquid monomers at roughly 80°C and 1 X 10 torr onto polyethylene terephtholate and then radiation polymerized the surface using electron beam radiation. 

The results of peroxide initiated and Trigonal 14 photoiniti-ated polymerizations of lauryl acrylate (LA), I,6-hexanediol diacrylate (HDDA), neopentyl glycol diacrylate (NPGDA), and trimeth-ylol propane triacrylate (TMPTA) will first be presented. These experiments were designed to observe total heats of polymerization under prescribed conditions. The results of more extensive rate studies on Trigonal 14 photolnitlated LA polymerizations will then follow. 

DTAB Hexanediol diacrylate, n-decylacrylate, PEG400-dimethaccrylate, 2 -hydroxyethyl-methacrylate Cubic, hexagonal, lamellar Phases retained to a great extent Not characterized Investigation of polymerization kinetics [54]... 

In recent reports (2-7), it has been shown that it is important to consider the effect of such laser operating parameters as pulse repetition rate on the polymerization kinetics. It was clearly demonstrated that pulsing the laser at narrow time intervals on the order of the lifetime of growing polymer radical chains resulted in a premature chain termination due to injection of small molecule "terminator" radicals into the system. In this paper we focus on the effect of pulse repetition rate on the polymerization of multifunctional acrylates, in particular 1,6-hexanediol diacrylate (HDODA) and trimethylolpropane triacrylate (TMPTA). 

We can also classify the systems based on the states of the reactants and products. Monofunctional monomers such as benzyl acrylate are liquids and produce liquid polymers, and we call these Tiquid/liquid systems. Figure 1 shows a schematic of the changes in properties across a liquid/liquid front. Multifunctional monomers such as 1, 6 hexanediol diacrylate (HDDA) are liquid but produce a thermoset, solid product, and these we call liquid/solid systems. Finally, solid monomers such as acrylamide (8,25) and transition metal nitrate complexes of acrylamide (26-28) can be polymerized frontally in solid/solid systems. 

Additional shape control was achieved by combining two liquids, one of which was polymerizable, and the other not Nisisako and Torii [3] also demonstrated, using the same device, that the droplet shape could be varied by altering the combination of the silicon oil and the photo-polymerizable hexanediol diacrylate. After polymerization and removal of excess silicon oil by washing, the remnant particles were seen to have different shapes (Figure 14.22). 

When photoinitiators consisting of mixtures of benzophenone, or 4-benzoylbiphenyl, or isopropylthioxanthone vdth a tertiary amine are combined with an electron deficient anhydride, rapid photoinitiations of polymerizations of acrylate esters result. Thus, additions of less than 0.1 wt. percent 2,3-dimethylmaleic anhydride to 1,6-hexanediol diacrylate containing any of the above diaryUcetones and N-methyldiethanolamine result in an increase in the polymerization rate maximum by a factor of as much as three that is attained for the same reaction without the anhydride. Laser flash photolysis results show that benzophenone, 4-benzoylbiphenyl, and isopropylthioxanthone triplets are readily quenched by dimethylmaleic anhydride. 

Novikova et al., reported that some pentaaza-1,4-dienes can photo initiate polymerization. Thus, l,5-Bis(4-methoxyphenyl)-3-methyl-l,4-pentazadiene, l,5-diphenyl-3-(2-hydroxyethyl)-l,4-pentaza-diene, and 1,5-diphenyl-3-methyl-l,4-pentazadiene were used as photoinitiators of radical polymerization of hexanediol diacrylate and of methyl methacrylate. Photoinitiation abilities of these compounds were compared with those of a commercial photoinitiator, Irgacure 1700. The pentaazodienes showed a high initiation capacity. Also, the activation energy of the polymerization in the presenee of the pentaazodiene compounds was lower than that for Irgacure 1700. 

Fig. 20. Rate versus extent of polymerization for HDDA, recorded at various light intensities. Initiator 4wt.-% HMPP. <2 ppm of oxygen. Continuous curves 1,6-hexanediol diacrylate. Dotted curves a,a -dideutero-l, 6-hexanediol diacrylate. Intensities are in mW cm . (From Ref. with permission)...

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