Die Struktur der ungeordneten Bereiche in den Mikrofibrillen hochorientierter Polymere

Abstract

Auf der Grundlage von Untersuchungsergebnissen der Elektronenmikroskopie, der Röntgendiffraktometrie, der Infrarotspektroskopie, der Kernresonanzspektroskopie und anderer Methoden wird ein Modell für die Struktur der ungeordneten Bereiche der Mikrofibrillen hochorientierter partialkristalliner Polymere vorgeschlagen. Diese Modell ist durch eine große Anzahl durchgehender Molekülabschnitte in den ungeordneten Bereichen charakterisiert. Anhand des Modells werden einige makroskopische Eigenschaften orientierter Polymere diskutiert.

Straight‐Chain Segment Length Distribution in Oriented Polyethylene as Revealed by LAM-Raman Spectroscopy

“…These segments are of predominantly crankshaft shape and have a length distribution caused by various content of irregular conformers of 2G1 type and double bends. [5] Some portions of the intrafibrillar molecular segments may comprise trans-sequences and pass through several crystallites in the same microfibril (Fig. 4).…”

“…Model of a disordered microfibrillar region proposed by Marikhin. [5] The tie segments are formed by crankshaft-type conformers (1); trans-conformers (2); GG-conformers (3); and TGTconformers (4).…”

Structural Basis of High‐Strength High‐Modulus Polymers

“…The SAXS pattern from drawn gel-crystallized UHMWPE samples exhibits conventional meridional streaks even at a high draw ratio (Figure lO Figure 11. Model of a disordered microfibrillar region proposed by Marikhin (89). The tie segments are formed by crankshaft type conformers (1); trans-conformers (2); GG-conformers (3) and TGT-conformers (4) larger than in solution-cast samples, which leads to a certain skewing of the crystallites at the last drawing stage.…”

“…We believe [89] that the majority of chains in these regions are the chains of different length with a conformation of the crankshaft type ( Figure 11). The major conformational defects are 2G1 defects, in the classification of Pechold [97].…”