預(yù)氧化技術(shù)ppt課件-資料下載頁(yè)
2025-01-17 10:45本頁(yè)面
【正文】 強(qiáng)度的聚丙烯腈纖維不一定總是可以生產(chǎn)出高強(qiáng)度的碳纖維，這是因?yàn)轭A(yù)氧化和碳化的過(guò)程控制條件在聚丙烯腈纖維向碳纖維的轉(zhuǎn)化過(guò)程中也起著重要的作用。對(duì)于給定的聚丙烯腈纖維，制得的碳纖維的拉伸強(qiáng)度主要受一下七個(gè)參數(shù)的影響： 。在預(yù)氧化過(guò)程初始階段的拉伸導(dǎo)致聚丙烯腈大分子的去向和隨后的階梯結(jié)構(gòu)。以上的兩個(gè)條件為制備高質(zhì)量的碳纖維奠定基礎(chǔ)。 ，碳纖維的拉伸強(qiáng)度的增加可以通過(guò)提高預(yù)碳化的溫度，在 750℃ 時(shí)達(dá)到最大值。預(yù)碳化拉伸的應(yīng)用有利于保持在預(yù)氧化過(guò)程中建立起來(lái)的去向。還有一點(diǎn)需要注意，拉伸率一定要通過(guò)在線監(jiān)測(cè)謹(jǐn)慎控制，否則纖維可能會(huì)斷裂。 ，在 1200℃ 以下碳纖維拉伸強(qiáng)度的提升非?？欤?dāng)溫度高于1200℃ 提升就變的緩慢了。即使在碳化過(guò)程中，也需要對(duì)于拉伸進(jìn)行適當(dāng)?shù)木徍鸵灾苽渥顑?yōu)碳纖維。 Effects of Preoxidation Conditions on Adsorption Performance of Activated Carbon Fibers CAI Yulin,XU Shanqing, DING Xin Journal of Donghua University() , (2022) 6 Introduction ? In order to investigate the effects of preoxidation conditions on adsorption performance of activated carbon fibers, PAN fiber webs were adopted as precursors for preparing ACFs. Preoxidation temperature, heating rate, and treatment time are the main factors on affecting the adsorption performance of the ACFs. Results and Discussion Results and Discussion Results and Discussion Conclusion ? When the preoxidative temperature is 230℃ in the present study, the ACFs show the best benzene adsorption capacity. ℃ /min and less than 30 min are the preferable for ACFs to achieve high benzene adsorption capacity. Jones D B, Song H, Karanfil T. The effects of selected preoxidation strategies on ITHM formation and speciation[J]. Water Research, 2022. 7
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