Chemical Forums
Specialty Chemistry Forums => Materials and Nanochemistry forum => Topic started by: Stoian on May 30, 2010, 02:23:30 PM
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i don't know what biaxially oriented refers to.is it about the tacticity of the polymer?
is it isotactic?syndiotactic?or what?
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http://composite.about.com/library/glossary/b/bldef-b643.htm
It is not giving information about polymer chain tacticity, but their physical orientation within a material. Look up the process of drawing if you would like to find out more.
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biaxially oriented is a polymer processing technique used in thin films. Potato chip bags use biaxially oriented film (Frito Lay).
The proces I am familar with biaxially orients PP and PET. Polymer is extruded, then it is stretched in the machine direction (made longer, orientation 1). It is then passed through a large oven that stretches the film in the cross machine direction (makes wider, orientation 2).