characterization.ppt

1、Synthesis and characterization of chitosan-g-poly(acrylic acid)/attapulgite superabsorbent composites,Junping Zhang a,b, Qin Wang a,b, Aiqin Wang a,*,Carbohydrate Polymers 68 (2007) 367374,指導教授：林鴻儒 博士 姓名：徐楓茜 日期：98.08.14,Outline,Introduction Materials Experimental Results and discussion Conclusions,I

2、ntroduction,親水性的網狀高分子，可把水份鎖在裡面，不易流失。像傳統的吸水性材料如海綿，棉和紙漿等。這些高吸水性材料廣泛的應用在衛生產品，園藝，藥物釋放，煤炭脫水，然而這些材料都容易降解，對環境有影響。 因此Kiatkamjornwong等人利用親水性單體乙烯基接枝在天然高分子澱粉及Chitosan側鏈上的-NH2及-OH，使其水膠具有吸水之性質。 現今Chitosan廣泛的應用於生醫材料，且具有較好的生物相容性。 因此利用高吸水性材料丙烯酸接枝Chitosan，不僅可以改善生物降解的問題，且材料也具有吸水的特點。,近年來，Clay常應用於與吸水性材料做結合，來改善其膨潤性質與降低成

3、本並可加強水膠之強度。,Introduction,Material,Acrylic acid (AA) ammonium persulfate (APS) N,N-methylenebisacrylamide (MBA) Chitosan (CTS) Attapulgite (APT),Experimental - different MW,40 ml distilled water,2 g CTS,30% H2O2(0.3, 1.0, 3.7, 9.4ml),Suspension,Stirred and kept at 50, 2h,Filtrated,Solid,Solid (washed

4、),Washed with distilled water to pH=7,Solid,Dried under vacuum at 50,Average molecular weight of CTS was determined by viscometry measurement,Preparation of CTS-g-PAA/APT,1% acetic acid solution 30ml,In the 250 ml four-neck flask, equipped with a mechanical stirrer, a reflux condenser, a funnel and

5、a nitrogen line,Purged with nitrogen for 30 min to remove oxygen and heated to 60 ,0.10 g APS,3.55 g AA,MBA and APT,10 min,The water bath, kept 60, 3h,Transferred 1M NaOH aqueous solution to be neutralized to pH=7, dried in oven or dewatering agents, methanol, ethanol and acetone,Use filter paper wi

6、ping off excessive dewatering agents,Spread on a dish to dry overnight at room temperature,Use 40-80 mesh milled,CTS,Results and discussion,Fig. 2. IR spectra of (a) APT, (b) uncrosslinked CTS-g-PAA/APT, (c) CTS, (d) CTS-g-PAA and (e) CTS-g-PAA/APT. Weight ratio of AA to CTS is 7.2; average molecula

7、r weight of CTS is 22.9*104; MBA content is 2.94 wt%; APT content is 10 wt%; dewatered with methanol.,C-H,COO-,C-H,C=O,-NHCO,C3-OH,C6-OH,Si-OH,COO-,-NH2,COO-,C-H,Fig. 3. TGA curves of CTS-g-PAA and CTS-g-PAA/APT. Weight ratio of AA to CTS is 7.2; average molecular weight of CTS is 22.9*104; MBA cont

8、ent is 2.94 wt%; APT content is 10 wt%; dewatered with methanol.,381.7,578.4,604.3,Fig. 4. SEM micrographs of (a) APT, (b) CTS-g-PAA and (c) CTS-g-PAA/APT superabsorbent composite. Weight ratio of AA to CTS is 7.2; average molecular weight of CTS is 22.9*104; MBA content is 2.94 wt%; APT content is

9、10 wt%; dewatered with methanol.,Fig. 6. Variation of water absorbency for the CTS-g-PAA/APT superabsorbent composite with MBA content. Weight ratio of AA to CTS is 7.2; average molecular weight of CTS is 22.9*104; APT content is 10 wt%; dewatered with methanol.,Fig. 5. Variation of water absorbency

10、 for the CTS-g-PAA/APT superabsorbent with average molecular weight of CTS. Weight ratio of AA to CTS is 7.2; MBA content is 2.94 wt%; APT content is 10 wt%; dewatered with methanol.,Fig. 7. Variation of water absorbency for the CTS-g-PAA/APT superabsorbent composite with weight ratio of AA to CTS.

11、Average molecular weight of CTS is 22.9*104; MBA content is 2.94 wt%; APT content is 10 wt%; dewatered with methanol.,Fig. 8. Variation of water absorbency for the CTS-g-PAA/APT superabsorbent composite with weight ratio of AA to CTS. Weight ratio of AA to CTS is 7.2; average molecular weight of CTS is 22.9*104; MBA content is 2.94 wt%; dewatered with methanol.,Fig. 9. Variation of water absorbency for the CTS-g-PAA/APT superabsorbent composite with dewatering agents. Weight ratio of AA to CTS is 7.2; average molecular weight of CTS is 22.9 *104; MBA content is 2.94 wt%; APT cont