메뉴 건너뛰기
Science
Volumn 223, Issue 4633, 1984, Pages 283-285
Native cellulose: A composite of two distinct crystalline forms
Author keywords

[No Author keywords available]
Indexed keywords

EID: 36048972648     PISSN: 00368075     EISSN: None     Source Type: Journal    
DOI: 10.1126/science.223.4633.283     Document Type: Article
Times cited : (1000)
References (21)
  • 16
    • 0016388320 scopus 로고
    • The procedure was as follows: 85 g of micro- crystalline cellulose, wet with 62 ml of distilled water, was dissolved in 1590 ml of 85 percent phosphoric acid. After it was allowed to stand for 6 weeks, the mixture was filtered through fine glass (pore size, 4 to 5. 5 μm) and then it was added to three times its volume of distilled water. The precipitate was separated by centrifugation, and the clear liquid saved. A portion of the precipitate, which was cellulose II of relatively high crystallinity, was then boiled in 4N HCl for 48 hours. The residue, in 3. 3 percent yield, was cellulose I. A similar sample had been prepared by hydrolysis of another portion of the precipitate in water at 210°C, in a pressure vessel, for 2 hours. The x-ray diffractograms were similar to one reported earlier, and leave no doubt that the samples are the pure cellulose I polymorph. The clear liquid from the centrifugation was added to an equal volume of methanol. A small amount of additional precipitation occurred; this was the cellulose II of the highest crystallinity used in recording the signature spectrum. Both regenerated celluloses I and II were of a degree of polymerization below 20
    • (1974) Science , vol.185 , pp. 522
    • Atalla, R.H.1    Nagel, S.C.2
  • 18
    • 0020979473 scopus 로고
    • The proposal that native celluloses are composites of Iα and Iβ is distinct from, although complementary to, the structural model proposed by, on the basis of spectroscopic studies. The distinct conformations identified as kI and kII in that model correspond to the forms of cellulose here represented as Iβ and II. The spectroscopic studies that formed the basis of the conformational model involved native celluloses in which Iβ is dominant
    • (1983) Appl. Polym. Symp. , Issue.37 , pp. 295
    • Atalla, R.H.1

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.