Remarkable rise of viscosity was observed by adding trialkyl-1,3,5-benzenetricarboxamide into organic solvents; the formation of highly viscoelastic solution was discussed by viscosity measurement, FTIR spectroscopy, and X-ray molecular structure in the crystal.
在有机溶剂中加入三烷基-1,3,5-苯三甲酰胺后,观察到粘度显著上升;通过粘度测量、傅里叶变换红外光谱和晶体中的 X 射线分子结构,讨论了高粘弹性溶液的形成。
Solution casting method and polymer film
申请人:Sugiura Masaru
公开号:US20050077648A1
公开(公告)日:2005-04-14
A solvent in which dichloromethane is mixed with alcohol as a poor solvent is used for preparing a dope. Alcohol is supplied to the dope in a inline pipe to mix with a static mixer, such as a casting dope in which a composition of alcohol is increased. The temperature of the rotary drum is adjusted to −7° C. The casting dope is fed from a casting die to the rotary drum so as to form a casting film whose thickness is 40 μm. Since the content of alcohol is high and a storage modulus of the cooled casting film is at least 150 thousands Pa, the peeling defect does not occur, and the stretch is reduced as far as possible. A gel-like film is dried by a tenter type drying device, and stretched such that the stretch ratio is at most 110%. The produced film is thin and excellent in a surface condition and optical isotropy.
An extruded air cooled blown film having a) a total thickness of 5 to 500 μm, b) a mono-layer structure or 2 to 9 coextruded layers, c) at least one layer L containing a polymer selected from the group consisting of polypropylene homopolymers, polypropylene random copolymers, hetero-phasic polypropylene block copolymers, or any mixtures thereof, said polymer having a melt flow rate, according to ASTM D-1238, of 0.1 to 10 dg/min at 230° C. and 2.16 kg, said layer L further containing 0.001 to 2%, relative to the weight of the polymer, of a particular nucleating agent, and optionally d) a Modulus according to EN ISO 527 enhanced by at least 10% versus a reference film without the nucleating agent.