碩士 / 國立彰化師範大學 / 生物學系 / 103 / This study is explored an alternative raw material for pulping and papermaking, and to investigate the effect of different pulping conditions on the strength properties of handsheets made from the algae. The seaweeds of this investigation were collected from the coastal waters of northern Taiwan (Gelidium sp.) and southern Taiwan (Sargassum sp., Enteromorpha sp., Ulva lactuca). Twenty five gram seaweeds were cooking at 100℃ for 60min with 5%,10% (w/w) nitric acid to enhance the extraction, and increased the efficiency of the extracton process. The water and red algae (dry weight) ratio was 10:1. After pre-extraction, we extracted the fiber at either 100℃or 140 ℃ for 1h and 3 h. In the extraction process, 10% and 20% sodium hydroxide by dry weight of red algae was used to enhance the extraction. The solids were separated from the extract by passing through a 150 mesh screen, then washed with water. One litter water add to the red algae pulp to make handsheets. The morphology of the cellulose samples were examined on both light microscope (LM) and scanning electron microscope (SEM). Four mechanical properties (breaking length, bursting strength, tearing strength and tensile strength) of red algae pulp were selected for the study. The result showed that Sargassum sp., Enteromorpha sp., and Ulva lactuca contained a small amount of fiber. Only Gelidium sp. has the optimum conditions can pre-extraction in 5%v(w/w) nitric acid, then pulping at 140℃, 3h, 20% (dry algae) sodium hydroxide. The algal paper of bursting strength is 2.06 kpa×m2×g-1, breaking length is 1.66 km, tensile strength is16.35 N×m×g-1and tearing strength is 1.94 mN×m2×g-1.
| Identifer | oai:union.ndltd.org:TW/103NCUE5112002 |
| Creators | Chun Wan, 萬鈞 |
| Contributors | Wei-Lung Wang, 王瑋龍 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 61 |
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