Fluoroalkyl Siloxanes as Liquid-Repellent Fabric Finishes. Part 2. The Homopolymers and their Copolymers with Alkyl Silanes
DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
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In this report the liquid-repellant properties of the homopolymers and selected copolymers of ten fluoroalkyl substituted silane monomers of varying structures are evaluated. The homopolymers of the silanes are synthesized, applied to nyloncotton 5050 weight per cent and cotton as finishes, and the oil and water repellency imparted to these fabrics ascertained by standard tests,. In this manner it is possible to compare the effects of 1 length and degree of branching of the fluorinated alkyl chains, 2 the use of network three replaceable silane substituents in the monomer versus linear two replaceable substituents siloxane polymers, and 3 the use of either an amide or an ether function to bond the fluoroalkyl group to the polymer backbone. Due to the expense of these fluorinated materials, a study was conducted of the copolymerization of the best fluoroalkyl substituted silanes with much cheaper non-fluorinated alkyl silanes. Among the latter were those with varying alkyl chain lengths and number and orientation of the replaceable silane substituents. The oil and water repellencies obtained with both the homopolymers and copolymers ranged from outstanding to essentially none. Explanations are advanced for the values obtained and literature comparisons are made.
- Coatings, Colorants and Finishes