静水圧冷間押出し加工した高密度ポリエチレンの分子配向と機械的性質 (高分子の加工と物性-2-<特集>) -- (個化・冷間加工)
スポンサーリンク
概要
- 論文の詳細を見る
The preceding report (part I) in this series has shown the characteristics of the hydrostatic extrusion at room temperature and the fine structure of extruded high-density polyethylene (HDPE). This report examines the effects of the extrusion conditions on the molecular orientation and mechanical properties of extruded HDPE. Following results were obtained. (1) The molecular orientation in the extrudates is uniaxial with cylindrical symmetry around the extrusion axis. (2) The crystalline orientation is the typical uniaxial one in which the c-axis orientation parallel to the extrusion axis becomes higher with increasing extrusion ratio. (3) The spacings for (110) and (200) planes of the crystal are not changed during the hydrostatic extrusion. (4) The amorphous chain is orientated perpendicular to the extrusion direction at the initial stage of the extrusion, then it is oriented parallel to the direction. (5) The tensile strength of the extrudate increase monotonically with increasing extrusion ratio; the Young's modulus shows the same dependence with a small hump at a small extrusion ration; and the elongation at break shows a prominent maximum at a relatively low extrusion ratio, then it decreases to a level. (6) The essential difference between the deformation mechanisms of the hydrostatic extrusion and drawing is assigned to the difference in the locations of the points of the stress concentration during the deformation.
- 公益社団法人 高分子学会の論文
公益社団法人 高分子学会 | 論文
- 情報の入口--高分子センサ-とトランスデュ-サ- (情報化社会と高分子)
- 高分子科学最近の進歩--メルトレオロジ-(伸長粘度)
- 高分子系の相分離--特にポリマ-ブレンドについて
- 導電性高分子の磁気緩和--NMRT-1〓1の周波数依存性
- 多機能性高分子の合成 (化学修飾による多機能性高分子)