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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 이중명
- 발행연도
- 2019
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초록· 키워드
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The purpose of this study was to evaluate the solubility of solvents in solvents and to investigate the difference in the strength of recrystallized films.
LAS pulping method was modified to prepare a chemical undifferentiated sample of pine wood powder (40-60 mesh). The reaction time was set to 30 minutes, 60 minutes, 90 minutes, and 120 minutes by mixing 0.5 to 5% (v / v) of hydrochloric acid or sulfuric acid with glycol ether solvent. NaOH / urea / water (12 wt% / 7 wt% / 81 wt%) was used as the dissolving agent for the dissolution and regeneration of the sample and a 5% aqueous solution of sulfuric acid was used as the regenerant.
By controlling the type of catalyst and reaction conditions, samples with different chemical properties could be prepared. In most of the reaction conditions, there was little difference in aspect ratio among the samples prepared by adding sulfuric acid or hydrochloric acid. However, in the reaction conditions of 90 min / 5% and 120 min / 5% with the addition of hydrochloric acid, the abrupt decrease of the aspect ratio was observed compared with the reacted samples at the concentration of the previous catalyst, while the samples prepared by adding sulfuric acid continuously increased the aspect ratio Respectively. That is, the sample with sulfuric acid is split in the fiber direction as the concentration of the catalyst increases, whereas the sample with hydrochloric acid is split in the fiber direction and the fiber is cracked in the vertical direction.
The correlation coefficient between the chemical properties and the dissolution rate showed the highest value of residual lignin content and degree of polymerization. However, hemicellulose also showed a high correlation. In addition, as a result of examining the behavior of the constituents in the dissolution process, a considerable amount of mannose remained in the insoluble residue after the second dissolution. According to these results, it is thought that hemicellulose, especially mannose, also affects solubility in dissolving solvents, though it is small.
When the film was regenerated, the tensile strength of the dissolvable / regenerated film was higher than that of the MCC used as the control.
LAS pulping method was modified to prepare a chemical undifferentiated sample of pine wood powder (40-60 mesh). The reaction time was set to 30 minutes, 60 minutes, 90 minutes, and 120 minutes by mixing 0.5 to 5% (v / v) of hydrochloric acid or sulfuric acid with glycol ether solvent. NaOH / urea / water (12 wt% / 7 wt% / 81 wt%) was used as the dissolving agent for the dissolution and regeneration of the sample and a 5% aqueous solution of sulfuric acid was used as the regenerant.
By controlling the type of catalyst and reaction conditions, samples with different chemical properties could be prepared. In most of the reaction conditions, there was little difference in aspect ratio among the samples prepared by adding sulfuric acid or hydrochloric acid. However, in the reaction conditions of 90 min / 5% and 120 min / 5% with the addition of hydrochloric acid, the abrupt decrease of the aspect ratio was observed compared with the reacted samples at the concentration of the previous catalyst, while the samples prepared by adding sulfuric acid continuously increased the aspect ratio Respectively. That is, the sample with sulfuric acid is split in the fiber direction as the concentration of the catalyst increases, whereas the sample with hydrochloric acid is split in the fiber direction and the fiber is cracked in the vertical direction.
The correlation coefficient between the chemical properties and the dissolution rate showed the highest value of residual lignin content and degree of polymerization. However, hemicellulose also showed a high correlation. In addition, as a result of examining the behavior of the constituents in the dissolution process, a considerable amount of mannose remained in the insoluble residue after the second dissolution. According to these results, it is thought that hemicellulose, especially mannose, also affects solubility in dissolving solvents, though it is small.
When the film was regenerated, the tensile strength of the dissolvable / regenerated film was higher than that of the MCC used as the control.
목차
1. 서론 12. 재료 및 방법2. 1. 공시재료 22. 2. 실험방법 22. 2. 1. LAS 처리 22. 2. 2. 측정 42. 2. 2. 1. 수율 42. 2. 2. 2. 현미경 관찰 52. 2. 2. 3. 클라손 리그닌 52. 2. 2. 4. 조성당 분석 62. 2. 2. 5. 용해율 측정 72. 2. 2. 6. 점도 평균 중합도 측정 72. 2. 2. 7. 용해 및 재생 82. 2. 2. 8. 필름의 강도 측정 82. 2. 3. 용해 과정에서 셀룰로오스, 헤미셀룰로오스, 리그닌의 거동 103 . 결과 및 고찰3. 1. 미분화 시료의 특성 103. 1. 1. 수율 103. 1. 2. 형태학적 관찰 123. 1. 3. 클라손 리그닌 213. 1. 4. 조성당 분석 243. 1. 5. 점도 평균 중합도 283. 1. 6. 용해율 293. 1. 7. 용해율과 화학적 특성들 간의 상관관계 313. 2. 용해 및 재생 323. 2. 1. 용해 용제에 대한 용해율 323. 2. 2. 필름의 특성 333. 3. 용해과정에서 조성분의 거동 373. 3. 1. 불용해 잔류물의 용해율 373. 3. 2. 용해부와 불용해부의 조성분 함량 384. 결론 41참 고 문 헌영 문 초 록 47
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