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Photoyellowing of chemically modified chemithermomechanical pulps (CTMP) from Eucalyptus globulus under various atmospheres
http://hdl.handle.net/10191/30467
http://hdl.handle.net/10191/30467009377e1-d499-4c3b-b4ef-9fecdbe4e227
名前 / ファイル | ライセンス | アクション |
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68_2_143-149.pdf (928.6 kB)
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Item type | 学術雑誌論文 / Journal Article(1) | |||||
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公開日 | 2014-11-19 | |||||
タイトル | ||||||
タイトル | Photoyellowing of chemically modified chemithermomechanical pulps (CTMP) from Eucalyptus globulus under various atmospheres | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | Photoyellowing of chemically modified chemithermomechanical pulps (CTMP) from Eucalyptus globulus under various atmospheres | |||||
言語 | ||||||
言語 | eng | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | chemical modification of CTMP | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | CTMP | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | Eucalyptus | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | oxygen | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | photoyellowing | |||||
キーワード | ||||||
主題Scheme | Other | |||||
主題 | UV microspectrophotometer(UMSP) | |||||
資源タイプ | ||||||
資源 | http://purl.org/coar/resource_type/c_6501 | |||||
タイプ | journal article | |||||
著者 |
Kojima, Yasuo
× Kojima, Yasuo× Kato, Yoshiaki× Ishikura, Yukiko× Yoon, Seung-Lak× Ona, Toshihiro |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | Chemithermomechanical pulps (CTMP) were prepared from Eucalyptus globulus and photoirradiated, and the responses have been examined by means of ultraviolet (UV) microspectrophotometer. The absorbance in the UV spectra of fiber walls increased in the range of 300 of 350 nm as a result of photoirradiation, indicating the formation of conjugated double-bound systems in the fiber walls. These spectral changes occurred only on the irradiated surface of sheets. CTMP photoirradiation under various atmospheres indicated that the presence of oxygen in the irradiation atmosphere is not necessary for CTMP yellowing. In nitrogen or vacuum, photoyellowing was at the same level as observed under oxygen. This observation was interpreted as a result of direct elimination of proton radicals from free phenolic groups and/or cleavage of β-aryl ether linkages. This induced probably the excited triplet state of α-carbonyl structures in CTMP, which leads to chromophore formation in the absence of oxygen. Reduction of CTMP with sodium borohydride impeded effectively the effects of photoirradiation only in the absence of oxygen. On the contrary, acetylation of CTMP had no effect in the absence of oxygen but led to photobleaching in the presence of oxygen. | |||||
書誌情報 |
Holzforschung en : Holzforschung 巻 68, 号 2, p. 143-149, 発行日 2014-01 |
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出版者 | ||||||
出版者 | Walter de Gruyter | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 00183830 | |||||
書誌レコードID | ||||||
収録物識別子タイプ | NCID | |||||
収録物識別子 | AA00664822 | |||||
DOI | ||||||
識別子タイプ | DOI | |||||
関連識別子 | info:doi/10.1515/hf-2013-0086 | |||||
著者版フラグ | ||||||
値 | publisher |