TMPTA trimethacrylate

It was found, when an attempt was made to conduct ship trials that the paint applier would be required to wear long sleeves, gloves, safety glasses, and a protective face shield. It is also a requirement that an eyewash fountain be nearby. These requirements were imposed because acrylates are skin, eye and respiratory tract irritants, but the problem lies mostly with the acrylated reactive diluent rather than with the acrylated resin (2,3). To avoid these problems, tests have been performed with use of trimethylolpropane trimethacrylate (TMPTMA) as a replacement for TMPTA. TMPTMA has been shown to be much less of an irritant than TMPTA, and is used in dental restorations. 

POLYETHYLENE GLYCOL 600 DIACRYLATE (PEGDA) POLYETHYLENE GLYCOL 400 DlMETHACRYLATE (PEGDMA) DIETHYLENE GLYCOL Dl METHACRYLATE (DEGDMA) TRIMETHYLOLPROPANE TRIACRYLATE (TMPTA) TRIMETHYLOLPROPANE TRIMETHACRYLATE (TMPTMA)... 

Crosslinking of PVC is known to occur on irradiation, with a low yield [Ohnishi et al., 1962]. More efficient crosslinking may be induced by irradiating PVC in the presence of multifunctional crosslinking agents [Salovey, 1973]. For example, plasticized PVC has been used as a wire and cable insulation. To enhance the crosslinking of PVC during electron irradiation, triallyl cyan-urate (TAC), trimethylolpropane trimethacrylate (TMPTMA), or trimethylolpropane triacrylate (TMPTA) have been used as the additives [Bradley, 1984]. 

The second kind is that of polyfunctional agents that could promote cross-linking (against chain scissioning). Trimethylol propane trimethacrylate (TMPTMA), trimethylol propane triacrylate (TMPTA) or triallyl isocyanurate (TAIC) belong to this category (Figure 9.3). 

Triallyl Isocyanurate (TAIC) Trimethylolpropane triacrylate (TMPTA) Trimethylolpropane trimethacrylate (TMPTMA)... 

The electron beam crosslinking of PVC/ENR blends by electron beam irradiation has been extensively reported by Ratnam and coworkers. The influence of MFAs such as trimethylolpropane trimethacrylate (TMPTA), 1,6-hexaediol diacrylate (HDDA) and 2-ethylhexyl acrylate (EHA), as well as acrylated polyurethane oligomer on the 70/30 PVC/ENR blend, was investigated. TMPTA was found to give the blend the best mechanical properties. Studies were also done on the effect of irradiation on various formulations of PVC/ENR blends with doses ranging from 50 to 200 kGy these studies included the influence of various additives on the efficiency of the radiation crosslinking of the blends. 

The mechanism of the reaction is first an abstraction of a hydrogen atom from the polymer chain, leading to the formation of a reactive radical site [6]. Then two polymer radicals can combine, which results in a polymer network. The network formed by those reactions is very irregular, fn order to improve the network the addition of compounds with multiple double bonds, for example, triaUyl cyanurate (TAG), triallyl isocyanurate (TAIC), trimethylol propane trimethacrylate (TMPTA), or ethylene dimethaciylate (EDMA) is necessary [6]. They are often referred to as activators. The effect is described as an addition to the radical site at the polymer chain and transfer of the radical to the activator. The network is formed by reaction of the transferred radical with another chain. 

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