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دانلود رایکان مقاله انگلیسی ISI با موضوع عمل آوری سریع مخلوط رزین PF با رزین های مختلف و تسریع کننده ها برای ساخت مواد کامپوزیت

عنوان فارسی مقاله:

عمل آوری سریع مخلوط رزین PF با رزین های مختلف و تسریع کننده ها برای ساخت مواد کامپوزیت

عنوان انگلیسی مقاله:

Fast curing PF resin mixed with various resins and accelerators for building composite materials

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بخشی از مقاله انگلیسی :

3. Results and discussion

3.1. Gelation time of phenolic resins

The comparison of resin gelation time, after adding novolac compound and curing accelerator, by using the laboratory-synthesized phenolic resins is shown in the Table 2. A gelation time reduction effect of about 20– 50% was observed at 100 C compared to the laboratory synthetic resin when mixing with novolac phenolic resin. However, the ideal novolac resin for use should be kept with the state distributed on the resol resin until the spreading and gelation of the resol resin is accelerated while resolving them in the cold-press process. The three types of commercially available novolac resins gave relatively good results for gelation acceleration, but suffer the limitation of being clogged into lumps while being resolved into the resol resin. The synthesis of higher molecular weight novolac resin is therefore required. Sodium carbonate was the most effective curing accelerator of phenolic resin; at 5% addition it reduced the gelation by 65–80% (100 C) as compared to that of phenolic resin. Therefore, we have reviewed in detail the phenolic resin curing acceleration effect of sodium carbonate.