SBR/PS IPNs

A. A. Donatelli, Morphology and Mechanical Behavior of Poly(butadiene-costyrene)/Poly-styrene Interpenetrating Polymer Networks, Diss. Abstr. Int. B. 36(5), 2369 (1975). SBR/PS IPNs. Ph.D. thesis. 

Figure 8.31. Modulus-composition data for SBR/PS full IPN s and semi-1 materials compared with theory (O) series 3 (semi-1) (A) series 4 (full) ( ) series 5 (full), (a) Kerner s equation (upper bound) (b) Davies equation (c) Kerner s equation (lower bound). (Donatelli et ai, 1975.)...

Research in interpenetrating pol3rmer networks (IPN s) over the past ten years has been reviewed by Sperling [1,2]. Those IPN s consisting of poly- styrene and SBR have been described in some detail [3-5] and a SANS study of BR/PS IPN s has also appeared [6]. The emulsion SBR s contained either 5 or 23.5 wt. % styrene, and crosslink densities were low. 

Table 5.3. Composition of SBR/PS Semi-IPNs and Full IPNs ...

The continuous cellular-type structure does contribute to the toughening process, as illustrated in Figure 7.4 for SBR/PS sequential IPNs. Impact values of about 5 ft-lb/in. of notch were attainable with 20-25% SBR elastomer. This value contrasts with values of 1.3-2.5 ft-lb/in. of notch usually encountered with high-impact polystyrene. 

A. A. Donatelli, L. H. Sperling, and D. A. Thomas, Interpenetrating Polymer Networks Based on SBR/PS. 1. Control of Morphology by Level of Crosslinking, Macromolecules 9(4), 671 (1976). SBR/Polystyrene IPN. Morphology and crosslinking level. 

IPNs based on SBR/PS studied by Donatelli et emphasises the control of morphology by varying the crosslinking levels, composition and chemical compatibility. The composition of an IPN affects the morphology and thereby the properties of the product. An increase or decrease in the percentage of the component polymers affects the domain size of the dispersed phase. Chantar-asiria et studied the variation of domain size with composition and... 

Many sequential IPNs have used two chain polymerizations, where monomer mix I is polymerized, monomer mix II is swelled in, followed by polymerization of monomer mix II. Typical examples involve poly(ethyl acrylate) and PS [Huelck et al., 1972], and SBR and PS [Curtius et al, 1972],... 

Figure 6.2. Selected morphologies of IPNs based on SBR and polystyrene, SBR stained with osmium tetroxide. Upper left Commercial high-impact polystyrene. Upper right, Ostromislensky s material, with no phase inversion middle left, semi-IPN, SBR crosslinked middle right, semi-11 IPN, PS crosslinked lower left, full IPN lower right, full IPN, higher crosslinking in the SBR.

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