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Reactive blending of poly (dimethylsiloxane) with nylon 6 and poly (styrene):Effect of reactivity on morphology
Author(s) -
Marić M.,
Ashurov N.,
Macosko C. W.
Publication year - 2001
Publication title -
polymer engineering and science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.503
H-Index - 111
eISSN - 1548-2634
pISSN - 0032-3888
DOI - 10.1002/pen.10759
Subject(s) - materials science , copolymer , polymer chemistry , styrene , compatibilization , morphology (biology) , reactivity (psychology) , particle size , gel permeation chromatography , chemical engineering , polymer blend , composite material , polymer , medicine , alternative medicine , pathology , biology , engineering , genetics
Reactive compatibilization was used to control and stabilize 20–30wt% poly(dimethylsioxane) (PDMS) dispersions in nylon 6 (PA) and poly(styrene) (PS), respectively. The effect of the type of reation (amine (NH 2 )/anhydride (An), NH 2 / epoxy(E) and carboxylic acid (COOH)/E) on the morphology was studied with electron microscopy. PS and PDMS have mutual solvents thus it was possible to use gel permeation chromatography (GPC) to determine the concentration of block copolymer in PS/PDMS blends. Reactive blending of PA6 with difunctional PDMS‐(AN) 2 did not decrease the PDMS particle size compared to the non‐reactive blend (∼10μm). Particle size decreaeased significantly to about 0.5 μm when PA6 was blended with a PDMS containing about 4 random An groups along the chain. For the PS/PDMS blends, GPC revealed that the NH 2 /An reaction formed about 3% block copolymer and produced stable PDMS particles ∼ 0.4 μm. No reaction was detected for the PS‐NH 2 /PDMS‐E blend and the morphology was coarse and unstable. Also, PS‐NH 2 /PDMS‐An reactivity was lower compared to other systems such as PS/ poly (isoprene) and PS/poly(methaacrylte) using the same reaction. This was attributed to the relatively thinner PS/PDMS interface dueto the high PS/PDMs immiscibility.