Sisal cellulose acetates obtained from heterogeneous reactions
In the present work, cellulose obtained from sisal, which is a source of rapid growth, was used. Cellulose acetates were produced in heterogeneous medium, using acetic anhydride as esterifying agent and iodine as catalyst, to check if the procedure described in the literature for commercial cellulos...
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| Language: | English |
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Budapest University of Technology and Economics
2008-06-01
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| Series: | eXPRESS Polymer Letters |
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| Online Access: | http://www.expresspolymlett.com/letolt.php?file=EPL-0000606&mi=cd |
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| description | In the present work, cellulose obtained from sisal, which is a source of rapid growth, was used. Cellulose acetates were produced in heterogeneous medium, using acetic anhydride as esterifying agent and iodine as catalyst, to check if the procedure described in the literature for commercial cellulose also is adequate to sisal cellulose. The results indicated that iodine is an excellent catalyst to obtain sisal cellulose acetates, but the reaction is so fast as described in the literature when, instead of sisal, lower average molar weight cellulose (microcrystalline) is used. The crystallinity index (Ic) of sisal cellulose acetates diminished compared to sisal cellulose, but there was no direct correlation between their degree of substitution (DS) and Ic. Probably acetyl groups were introduced more homogeneously along the short chains of microcrystalline cellulose, when compared to sisal cellulose, and then for microcrystalline cellulose acetates the Ic decreases as DS increases. Using the linear correlation that was found between degree of substitution (DS) and time reaction is possible to control the DS of sisal cellulose acetates, considering a large interval of degrees of substitution (0.3–2.8). |
| format | Article |
| id | doaj-art-994b5d5dae3f43c4af1afbe13cd17eae |
| institution | Kabale University |
| issn | 1788-618X |
| language | English |
| publishDate | 2008-06-01 |
| publisher | Budapest University of Technology and Economics |
| record_format | Article |
| series | eXPRESS Polymer Letters |
| spelling | doaj-art-994b5d5dae3f43c4af1afbe13cd17eae2025-08-20T03:35:23ZengBudapest University of Technology and EconomicseXPRESS Polymer Letters1788-618X2008-06-012642342810.3144/expresspolymlett.2008.51Sisal cellulose acetates obtained from heterogeneous reactionsIn the present work, cellulose obtained from sisal, which is a source of rapid growth, was used. Cellulose acetates were produced in heterogeneous medium, using acetic anhydride as esterifying agent and iodine as catalyst, to check if the procedure described in the literature for commercial cellulose also is adequate to sisal cellulose. The results indicated that iodine is an excellent catalyst to obtain sisal cellulose acetates, but the reaction is so fast as described in the literature when, instead of sisal, lower average molar weight cellulose (microcrystalline) is used. The crystallinity index (Ic) of sisal cellulose acetates diminished compared to sisal cellulose, but there was no direct correlation between their degree of substitution (DS) and Ic. Probably acetyl groups were introduced more homogeneously along the short chains of microcrystalline cellulose, when compared to sisal cellulose, and then for microcrystalline cellulose acetates the Ic decreases as DS increases. Using the linear correlation that was found between degree of substitution (DS) and time reaction is possible to control the DS of sisal cellulose acetates, considering a large interval of degrees of substitution (0.3–2.8).http://www.expresspolymlett.com/letolt.php?file=EPL-0000606&mi=cdBiopolymers, biocompositesSisal celluloseCellulose acetatesIodine - catalyst |
| spellingShingle | Sisal cellulose acetates obtained from heterogeneous reactions eXPRESS Polymer Letters Biopolymers, biocomposites Sisal cellulose Cellulose acetates Iodine - catalyst |
| title | Sisal cellulose acetates obtained from heterogeneous reactions |
| title_full | Sisal cellulose acetates obtained from heterogeneous reactions |
| title_fullStr | Sisal cellulose acetates obtained from heterogeneous reactions |
| title_full_unstemmed | Sisal cellulose acetates obtained from heterogeneous reactions |
| title_short | Sisal cellulose acetates obtained from heterogeneous reactions |
| title_sort | sisal cellulose acetates obtained from heterogeneous reactions |
| topic | Biopolymers, biocomposites Sisal cellulose Cellulose acetates Iodine - catalyst |
| url | http://www.expresspolymlett.com/letolt.php?file=EPL-0000606&mi=cd |