Choi, JH Cho, YW Ha, WS Lyoo, WS Lee, CJ Ji, BC Han, SS Yoon, WS 2024-01-21T16:38:54Z 2024-01-21T16:38:54Z 2021-09-03 1998-10 0959-8103 https://pubs.kist.re.kr/handle/201004/142840 To enhance the physical properties of syndiotacticity-rich (syndiotactic diad content 63.4%) ultra-high molecular weight (UHMW) (number-average degree of polymerization 12300) poly(vinyl alcohol) (PVA) him, it was solution blended with rigid-rod imogolite in dimethyl sulphoxide. In addition, the blend him prepared was stretched using a high-temperature zone drawing technique for effective orientation of the film. Through a series of experiments, it was found that imogolite caused significant changes in the structure and properties of syndiotacticity-rich UHMW PVA film, i.e. imogolite acted as an important agent which increased crystal orientation of syndiotacticity-rich UHMW PVA, resulting in enhanced tensile strength of the him. However, imogolite played a hindering role in raising the amorphous orientation of syndiotacticity-rich UHMW PVA. The maximum tensile modulus of 19.8 GPa and maximum tensile strength of 1.8 GPa could be obtained at the maximum draw ratio of 7.45 for PVA/imogolite blend film. In the case of PVA homo him, the highest tensile modulus and strength were 25.2 GPa and 1.4 GPa, respectively. (C) 1998 Society of Chemical Industry. English JOHN WILEY & SONS LTD LYOTROPIC MESOPHASE MECHANICAL-PROPERTIES AQUEOUS-SOLUTIONS HIGH-MODULUS COMPLEX POLYVINYL-ALCOHOL) SAPONIFICATION STRENGTH GELATION MIXTURE Preparation and characterization of syndiotacticity-rich ultra-high molecular weight poly(vinyl alcohol) imogolite blend film Article 10.1002/(SICI)1097-0126(1998100)47:2<237::AID-PI66>3.0.CO;2-E 1 POLYMER INTERNATIONAL, v.47, no.2, pp.237 - 242 POLYMER INTERNATIONAL 47 2 237 242 scie scopus 000076589000017 Polymer Science Polymer Science Article LYOTROPIC MESOPHASE MECHANICAL-PROPERTIES AQUEOUS-SOLUTIONS HIGH-MODULUS COMPLEX POLYVINYL-ALCOHOL) SAPONIFICATION STRENGTH GELATION MIXTURE syndiotacticity-rich UHMW PVA imogolite zone drawing orientation blend film