METHOD FOR ANALYZING LONG-CHAIN BRANCH STRUCTURE

• Main Authors: MAEDA SHUICHI, SUZUKI MICHINORI, SHIBA KOJI
• Format: Patent
• Language: English; Japanese
• Published: 06.10.2016
• Subjects: CHEMISTRY; COMPOSITIONS BASED THEREON; INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS; MEASURING; METALLURGY; ORGANIC MACROMOLECULAR COMPOUNDS; PHYSICS; TESTING; THEIR PREPARATION OR CHEMICAL WORKING-UP

PROBLEM TO BE SOLVED: To provide a method for simply determining presence/absence of a polymer long-chain branch structure by viscoelasticity measurement, and further determining an amount of the long-chain branch structures.SOLUTION: According to the present invention, concentration conversion G' and concentration conversion G" are obtained by measurement of angular frequency dependence of a storage elastic modulus G' and a loss elastic modulus G" of a solution that is composed of 100-10 mass% of polymer and 0-90 mass% of a soluble solvent. The long-chain structure analysis method determines presence/absence of a long-chain branch from a ratio of Y [Y/Y(where Yis a value obtained from a measured value of 100 mass% of polymer solution, and Yis a value obtained from a measured value of 30 mass% of polymer solution)] that is defined as Y=G'/C(where C represents a concentration of solution.) when relationship of concentration conversion G' and concentration conversion G" becomes X=G"/C=20,000 Pa.SELECTED DRAWING: None 【課題】 粘弾性測定により、簡便に高分子の長鎖分岐構造の有無を判定できるだけでなく、その長鎖分岐構造の多少を判定する方法を提供する。【解決手段】 本発明は、高分子の１００〜１０質量％と可溶性溶媒０〜９０質量％からなる溶液の貯蔵弾性率Ｇ′と損失弾性率Ｇ″の角周波数依存性の測定から求められる、濃度換算Ｇ′、濃度換算Ｇ″についてＸ＝Ｇ″／Ｃ２＝２０，０００Ｐａになる時のＹ＝Ｇ′／Ｃ２（但し、Ｃは溶液濃度を表す。）と定義されるＹの比［Ｙ（１００％）／Ｙ（３０％）（但し、Ｙ（１００％）は高分子１００質量％溶液の測定値から求められる値、Ｙ（３０％）は高分子３０質量％溶液の測定値から求められる値である。）］から長鎖分岐の有無を判断する長鎖分岐構造解析方法。【選択図】 なし