Polarized Infrared Studies of Amorphous Orientation in Polyethylene and Some Ethylene Copolymers

Deformation mechanism of high-density polyethylene probed by in situ Raman spectroscopy

“…These behaviors of 〈P 2 〉 are consistent with those estimated with the IR and the NIR spectroscopies [11][12][13][14][15]. It has been demonstrated that the orientation of the amorphous chains proceeds rapidly in the yielding region, as well as the crystalline chains, though the values of the orientation function of the amorphous chains are appreciably smaller than those of the crystalline chain [11][12][13]16,43]. These orientational behaviors of the amorphous chains seem to be consistent with the present results for the crystalline chains.…”

“…During such dual plastic deformations, large-scale transformation of the semi-crystalline morphology takes place, and collapse of the spherulite structures, necking of the sample specimens, and rearrangement of the lamellar crystals and the polymer chains have been observed [1][2][3][4][5][6]. Although various models, such as the lamellar local-melting and recrystallization model [4,7], and the lamellar cluster model [3,[8][9][10], have been proposed for the deformation mechanism, such complicated changes in the hierarchical structures of semicrystalline polymers are still controversial.Spectroscopic techniques have been applied for the orientational behavior of PE during elongation [11][12][13][14][15][16][17]. The infrared (IR) spectroscopy has been applied intensively, and it has been established that the molecular chains in the crystalline and amorphous phases orientate toward the draw direction [11][12][13][14].…”

“…Spectroscopic techniques have been applied for the orientational behavior of PE during elongation [11][12][13][14][15][16][17]. The infrared (IR) spectroscopy has been applied intensively, and it has been established that the molecular chains in the crystalline and amorphous phases orientate toward the draw direction [11][12][13][14].…”

“…The infrared (IR) spectroscopy has been applied intensively, and it has been established that the molecular chains in the crystalline and amorphous phases orientate toward the draw direction [11][12][13][14]. It has also been demonstrated that the orientation proceeds rapidly after the first yield, and gradually in the neck-propagation and the strain-hardening regions.…”

Transitions and Relaxations in Cis Polypentenamer and Its Hydrogenated Derivatives

“…6 The degree of crystallinity was determined using the 1894-and 2016-cm-1 absorbances according to the method of Read and Stein. 7 DSC measurements were carried out on a Perkin-Elmer Model DSC2. The scanning rate was 10 °C/min in all cases.…”