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纤维素水解过程中结晶度变化 采用 X射线衍射对纤维素在微波反应体系水解过程中结晶结构的变化进行了分析。图 1是微波前和微波后的 X射线衍射图 ,各峰所对应的位置为: 10 1晶面 2θ为 14 . 7 ° 、 102晶面 2θ为 16 . 5 ° 、002晶面 2θ为 22 . 5 ° 和 004晶面 2θ为 34 . 5 °从图中可以看，当微波辐射1h之后，2θ为 22 . 5 ° 处的峰强度随之降低，这表明纤维素的晶体结构受到了破坏，纤维素的结晶度也随着反应的进行而降低 ,由 91 . 7 %降低到 88 . 8 %. [ Last edited by 催化粪子 on 2009-7-21 at 15:02 ] |
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催化粪子(金币+5,VIP+0):xiexie`` 7-22 15:32
催化粪子(金币+5,VIP+0):xiexie`` 7-22 15:32
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Crystallinity changes in cellulose hydrolysis The changes of crystal structure during cellulose hydrolyzed in a microwave reaction system was analyzed by X-ray diffraction. Figure 1 shows X-ray diffraction spectra before and after the microwave reactions. The following peaks are assigned: 2θ is 14.7 ° at 101 crystal plane, 2θ is 16.5 ° at 102 crystal plane , 2θ is 22.5 ° at 002 crystal plane and 2θ is 004 at crystal plane 34.5 °. It also can be seen from Figure 1, the peak intensity decreases when 2θ is 22.5° after 1h microwave radiation. This indicates that the crystal structure of cellulose had been demolished, the crystallinity of cellulose was also decreased along with the microwave reaction progress, from 91.7% to 88.8%. |
2楼2009-07-21 16:28:14
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qingfeng877680(金币+3,VIP+0):兄弟翻译辛苦啦！ 7-25 16:52
qingfeng877680(金币+3,VIP+0):兄弟翻译辛苦啦！ 7-25 16:52
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纤维素水解过程中结晶度变化 crystallinity changes in cellulose hydrolysis process 采用 X射线衍射对纤维素在微波反应体系水解过程中结晶结构的变化进行了分析。图 1是微波前和微波后的 X射线衍射图 ,各峰所对应的位置为: 101晶面 2θ为 14.7 °、102晶面 2θ为16. 5°、002晶面2θ为22.5°和004晶面2θ为34.5°。从图中可以看，当微波辐1h之后,2θ为22.5°处的峰强度随之降低，这表明纤维素的晶体结构受到了破坏，纤维素的结晶度也随着反应的进行而降低, 由91.7 %降低到88. 8%. XRD method was applied to analyze crystal structure of cellulose during hydrolysis in microwave reaction system. Figure 1 showed XRD patterns of microwave treatment before and after. There are some corresponding peak positions as follows: 2θ is 14.7° at 101 crystal plane; 2θ is 16.5° at 102 crystal plane; 2θ shows 22. 5° at 002 crystal plane and 2θ is 34. 5° at 004 crystal plane. From the chart, after 1h as microwave radiation, 22.5° of 2θ of peak intensity was decreased. It indicating that crystal structure of cellulose had been destroyed, while fiber crystallinity was also reduced from 91.7% to 88.8% during reaction. |
3楼2009-07-21 20:06:43
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催化粪子(金币+5,VIP+0):翻译的太好了，怎么养再给你金币？ 7-22 15:33
qingfeng877680(金币+10,VIP+0):代楼主再奖励兄弟10个金币，辛苦啦！欢迎常来！ 7-25 16:52
催化粪子(金币+5,VIP+0):翻译的太好了，怎么养再给你金币？ 7-22 15:33
qingfeng877680(金币+10,VIP+0):代楼主再奖励兄弟10个金币，辛苦啦！欢迎常来！ 7-25 16:52
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Crystallinity Variation in the Hydrolysis Reaction of Cellulose X-ray diffraction (XRD) technique was applied to analyze the crystallinity variation in the hydrolysis reaction of cellulose carried out in microwave system. In Fig. 1 XRD data for cellulose before and after microwave treatment was shown. The peak assignment is as followings: 2θ = 14.7° originates from crytsal plane of (101), 2θ = 16.5° from (102), 2θ = 22.5° from (002) and 2θ = 34.5° from (004). Meanwhile, it is visible in Fig. 1 that the peak intensity decreases at 2θ = 22.5° after microwave radiation of 1 hr, indicating partial demolishment of the crystal structure of cellulose. The crystallinity further decreases with extended microwave reaction time from 91.7% to 88.8%. |
4楼2009-07-21 20:09:46