Preparation and characterization of syndiotacticity-rich ultra-high molecular weight poly(vinyl alcohol)/imogolite blend film

✍ Scribed by Choi, Jin Hyun; Cho, Yong Woo; Ha, Wan Shik; Lyoo, Won Seok; Lee, Chul Joo; Ji, Byung Chul; Han, Sung Soo; Yoon, Won Shik

• Publisher: John Wiley and Sons
• Year: 1998
• Tongue: English
• Weight: 244 KB
• Volume: 47
• Category: Article
• ISSN: 0959-8103
• DOI: 10.1002/(sici)1097-0126(1998100)47:2<237::aid-pi66>3.0.co;2-e

✦ Synopsis

To enhance the physical properties of syndiotacticity-rich (syndiotactic diad content 63É4%) ultra-high molecular weight (UHMW) (number-average degree of polymerization 12 300) poly(vinyl alcohol) (PVA) Ðlm, it was solution blended with rigid-rod imogolite in dimethyl sulphoxide. In addition, the blend Ðlm prepared was stretched using a high-temperature zone drawing technique for e †ective orientation of the Ðlm. Through a series of experiments, it was found that imogolite caused signiÐcant changes in the structure and properties of syndiotacticity-rich UHMW PVA Ðlm, i.e. imogolite acted as an important agent which increased crystal orientation of syndiotacticity-rich UHMW PVA, resulting in enhanced tensile strength of the Ðlm. However, imogolite played a hindering role in raising the amorphous orientation of syndiotacticity-rich UHMW PVA. The maximum tensile modulus of 19É8 GPa and maximum tensile strength of 1É8 GPa could be obtained at the maximum draw ratio of 7É45 for PVA/imogolite blend Ðlm. In the case of PVA homo Ðlm, the highest tensile modulus and strength were 25É2 GPa and 1É4 GPa, respectively. Society ( 1998 of Chemical Industry