書誌事項
- タイトル別名
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- Viscosity-Molecular Weight Relationships of Poly-(Vinyl Acetate) and Poly-(Vinyl Alcohol)
- V. Viscosity-Molecular Weight Relationship of Poly-(Vinyl Alcohol)
- 第5報ポリビニルアルコールの粘度分子量関係
説明
Relationships between limiting viscosity number and molecular weight of poly-(vinyl alcohol)(PVA) were studied. It was confirmed by light scattering method that the molecular weight of reacetylated PVAc agreed well with that of the original PVAc specimen, when the PVAc was obtained in low conversion (<10%). Therefore the degree of polymerization of the original PVAc was used for that of the corresponding PVA. The viscosity of aqueous solution of PVA depends on the rate of shear in the range 0-1000 sec--1 at 30°C, when the degree of polymerization of PVA exceeds 1700, and so in such a case the viscosity were corrected to that of zero rate of shear. The relationships between the corrected limiting viscosity number in ml/g [η] and weight and number average molecular weights Mw and Mn for the low coversion of PVA were given by:[η] =4.28×10-2Mw0.64 and [η] =6.70×10-2Mn0.64. The latter equation is coincident with Nakajima's equation obtained in a series of crude fraction of PVA. From these equations for the low conversion samples, the following relationships were derived for the perfectly homogeneous fraction:<BR>[η] = 4.53×10-2M0.64 and [η] = 5.08×10-1P0.64<BR>were P is the degree of polymerization.
収録刊行物
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- 高分子化學
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高分子化學 17 (180), 191-196, 1960
公益社団法人 高分子学会
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詳細情報 詳細情報について
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- CRID
- 1390282681496678272
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- NII論文ID
- 130003835371
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- ISSN
- 18848079
- 00232556
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- 本文言語コード
- ja
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- データソース種別
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- JaLC
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可
