Poly-4-hydroxystyrene, blend

Figure 4.2 An Archimedean tile morphology for blends of poly(2-vinylpyridine-/)-isoprene-/)-vinylpyridine) with poly(styrene-/)-4-hydroxystyrene) in a 2 1 vinylpyridine/hydroxystyrene blend. The vinylpyridine/hydroxystyrene domains are the cylinders at the vertices of polystyrene hexagons within a polyisoprene continuous phase. Reprinted from Asari et al. (2006). Copyright 2006 American Chemical Society.

Fig. 6 TEM image of a 50 50 diblock copolymer blend of poly(isoprene-l)/ocfc-2-vinylpyridine) (IP) and poly(styrene-6ZocA -4-hydroxystyrene) (SH). Reprinted with permission from [44], 2005 American Chemical Society...

Fig. 8 Illustration of a (3.4.6.4) Archimedian tiling self-assembled structure of a 2 1 blend of poly(2-vinylpyridine)-l>Zocfc-polyisoprene-l)Zocfc-poly(2-vinylpyridine) and polystyrene-fcZocfc-poly(4-hydroxystyrene). P denotes poly(2-vinylpyridine), H denotes poly(4-hydroxystyrene), S denotes polystyrene and I denotes polyisoprene. Reprinted with permission from [45]. 2006 American Chemical Society...

FIgyre 2.16 Variation of melting temperature with crystallization temperature for (O) poly(8-caprolactone) and ( ) poly(E-caprolactone) in a blend with poly(4-hydroxystyrene) (85% weight fraction of PCL). (From Ref. 15.)... 

The structure ofthis polymer was confirmed by NMR-spectroscopy [157], Such copolymers can be formulated into a high performance positive photoresist. By comparison, a physical blend of a phenolic and poly-4-hydroxystyrene was not useful because of its slow kinetics of mixing. Therefore, the synthesis of a copolymer of both components yields a material with improved lithographic... 

The dissolution rates of photoresist and polymers can also be regulated by making miscible blends of two or more polymers. Tables 57.9 and 57.10 list dissolution rates of binary blends of poly(4-hydroxystyrene) as well as poly(4-hydroxystyrene) and a silicon-containing copolymer [32,34]. This blending method is a convenient way to optimize the dissolution rates of photoresist polymers. 

TABLE 57.9. Dissolution rates of binary blends of poly (4-hydroxystyrene) In 0.21 N TMAH at room temperature [32]. ... 

Figure 6.11 (a) Chemical structure of the block copolymer components designed to self-assemble hierarchically by H-bonding interactions between the blocks. PEO-b-P(S-r-4HS), poly(ethylene oxide)-b-poly(styrene-r-4-hydroxystyrene) P(S-r-4VP)-b-PMMA), poly (styrene-r-4-vinylpyridine)-b-poly(methyl methacrylate)], (b) Transmission electron microscopy image of a solvent-annealed blend fibn of supramolecular block copolymers, (c) A cartoon illustrating the final fibn structure and the block copolymer chain packing. 

Blends with Poly(vinyl phenol) or Poly(4-hydroxystyrene) (P4HS)... 

Fig.5. Variation in melting temperature, Tjjj, with crystallisation temperature, T., for a series of blends of PCL with different proportions of poly(4-hydroxystyrene), illustrating the application of the Hofifman-Weeks procedme taken from [42]...

For blends of PCL with poly(4-hydroxystyrene) in which 60% of the hydroxyl groups were methoxylated to provide a copolymer of 4-hydroxystyrene and 4-methoxystyrene (Sect. 17.4), a value for -0.83x10" mol cm ... 

Zhao, J.Q., Pearce, E.M., and Kwei, T.K. (1997) Binary and ternary blends of polystyrene-block-poly(p-hydroxystyrene). Macromolecules, 30, 7119-7126. 

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