Polystyrene diblock copolymer

LeiblerL., Theory of microphase separation in block copolymers. Macromolecules, 13, 1602, 1980. Eoerster S., Khandpur A.K., Zhao J., Bates E.S., Hamley I.W., Ryan A.J., and Bras W. Complex phase behavior of polyisoprene-polystyrene diblock copolymers near the order-disorder transition. Macromolecules, 21, 6922, 1994. 

Zhu L, Chen Y, Zhang AQ et al. (1999) Phase structures and morphologies determined by competitions among self-organization, crystallization, and vitrification in a disordered poly(ethylene oxide)-b-polystyrene diblock copolymer. Phys Rev B Condens Matter 60 10022-10031... 

Figure 6.14 (a) Polystyiene-Z)-diaminotriazine-polystyrene diblock copolymers used to... 

Khandpur AK, Forster S et al (1995) Polyisoprene-polystyrene diblock copolymer phase diagram near the order-disorder transition. Macromolecules 28 8796-8806... 

Systems that employed HREELS for interfacial-composition determinations included poly(ethylene oxide)-polystyrene diblock copolymer on Si wafers formaldehyde poly(oxymethylene) films on Cu(lOO) and Lang-muir-Blodgett films of 4,4 -oxydianiline-pyromellitic dianhydride polyimide on Au and on highly ordered pyrolytic graphite. ... 

ABB Abbas, B., Schwahn, D., and Willner, L., Phase behavior of the polybutadiene-polystyrene diblock copolymer with the addition of the nonselective solvent dichlorobenzene in temperature and pressure fields, J. Polym. Sci. Part B Polym. Phys., 42, 3179, 2004. 

Fig. 8 (a, b) TEM images of ultiathin cross-sections of latex particles with multilayered onionlike morphology composed of poly(ixo-butyl methacrylate)-b-polystyrene diblock copolymer prepared via miniemulsion ATRP. From [79], with permission from Elsevier... 

Poly( 1,1 -dihydroperfluorooctyl acrylate)-b-polystyrene diblock copolymer carbon dioxide 2002TAY... 

Bousquet, A., Ibarboure, E., Drummond, C., Labragere, C., Papon, E., Rodriguez-Hemandez, J. Design of stimuli-iesponsive surfaces prepared by surface segregation of pol5qieptide-b-polystyrene diblock copolymers. Macromolecules 41, 1053-1056 (2(X)8)... 

The self-assembly induced by the photolysis was determined for a poly(4-tert-but05g styrene)- /oc -polystyrene diblock copolymer (PBSt- -PSt) [18] (Figure 2-1). In this photolysis-induced self-assembly, a diblock copolymer produced by the photolysis formed micelles. This new w of molecular self-assembly induced by photoirradiation has the potential to produce new plications for optical memory materials and optical devices using the photoirreversible reaction. 

Nghiem DQ, Kim P-D (2008) Direct preparation of high surface area mesoporous SiC-based ceramic by pyrolysis of a self-assembled polycarbosilane-block-polystyrene diblock copolymer. Chem Mater 20 3735-3739... 

Figure 6.12 Single crystals of poly(ethylene oxide)-Woc/c-polystyrene diblock copolymers, (a) Optical micrograph, (b) Electron micrograph. M (PS) = 7.3 x lO g/mol M (PEO) = 10.9 x 10 weight fraction polystyrene is 0.34 (52).

Figure 13.14 Dynamic storage shear modulus as a function of temperature for a series of polyisoprene-polystyrene diblock copolymers. Open and filled arrows indicate order-order and order-disorder phase transitions, respectively. The y-axis data have been multiplied for clarity sample g has the actual values of G. Note that all samples are above the glass transition temperatures of both polymers, and hence In the melt state.

Figure 13.15 Experimental phase diagram of polyisoprene-Woc/r-polystyrene diblock copolymers. The quantity />/ represents the volume fraction of polyisoprene. Open and filled circles represent the OOT and ODT transitions, respectively. The dash-dot cunre represents the mean-field prediction for the ODT. Solid curves delineate the different phases observed. Five different ordered microstructures have been observed for this system.

Figures Schematic illustration of the self-assembly of poly(phenylquinoline)-block-polystyrene diblock copolymers into hollow aggregates. (Adapted from S.A. Jenekhe and X.L. Chen. Science 279 1903, 1998.)... 

Marra, J., Hair, M. L. (1988). Interactions between two adsorbed layers of poly(ethylene oxide)/polystyrene diblock copolymers in heptane—toluene mixtures. Colloids and Surfaces, 34, 215-226. 

Polymerization of a-norbornenyl-polystyrene macromonomer, a-NBPS, with the Schrock-type catalyst Mo(NAr)(CHtBu)(OC(CH3)(CF3)2)2 in toluene at room temperature gave polynorbornene-polystyrene diblock copolymer (118) in a quantitative yield [86] [Eq. (50)]. 

Figure 24.2 Bulk segregation patterns of coil-coil diblock copolymers. (Reprinted with permission from A.K. Khandpur, S. Foerster, F.S. Bates et al, Polyisoprene-polystyrene diblock copolymer phase diagram near the order-disorder transition, Macromolecules, 28, 26, 8796-8806, 1995. 1995 American Chemical Society.)...

We found that the primary and secondary self-assembly of a poly(4-allyloxystyrene)-block-polystyrene diblock copolymer (PASt-b-PSt) was reversibly controlled by a variation in temperature. The thermoresponsivity of this block copolymer showed good hysteresis in the range between 20 and 40°C. This study describes the reversible control of the primary and secondary self-assemblies of the PASt-b-PSt copolymer in cyclohexane. 

A poly(4-tert-butoxystyrene)-block-polystyrene diblock copolymer (PBSt-b-PSt) was prepared as reported previously [20]. The molecular weight of the copolymer was Mn(PBSt-b-PSt) = 15400-b-96600 by IH NMR, while the molecular weight and its distribution were Mn = 58000, and Mw/Mn = 1.36 by gel permeation chromatography based on polystyrene standards. Tetrahydrofuran (THE) and cyclohexane were distilled over sodium. N,N-Dimethylformamide (DMF) was distilled over calcium hydride under reduced pressure. Allyl chloride was also distilled over calcium hydride. 

The PBSt-b-PSt (2.00 g) was dissolved in THE (70 mL). Concentrated hydrochloric acid (7 mL) was added to the copolymer solution. The mixture was heated at 85°C for 4.5 hours. The resulting solution was concentrated to ca. 30 mL by an evaporator, and was poured into water (1 L) to precipitate a polymer. The precipitates were collected by filtration, then freeze-dried with 1,4-dioxane to obtain poly(vinylphenol)-block-polystyrene diblock copolymer (PVPh-b-PSt, 1.593 g). The PVPh-b-PSt (0.70 g) was dissolved in DME (15 mL). Sodium hydride (0.414 g, 17-3 mmol) was added to the copolymer solution at 0°C under nitrogen atmosphere. The suspension was stirred at 0°C for 5 minutes and was further stirred at room temperature for 1 hour. Allyl chloride (1.41 g, 18.4 mmol) in DMF (5 mL) was added to the suspension at 0°C. The mixture was stirred at 0°C for 5 minutes and was further stirred at room temperature for 20 hours. The resulting solution was poured into methanol (1 L) to precipitate a polymer. The precipitates were collected by filtration, then dried in vacuo for several hours. PASt-b-PSt (0.68 g) was obtained. The molecular weight of the PASt-b-PSt was determined to be Mn(PASt-b-PSt) = l4000-b-96600 by IH NMR. 

E. Yoshida and S. Kuwayama, Micelle formation induced by photolysis of a poly(tert-butoxystyrene)-block-polystyrene diblock copolymer, Colloid and Polymer Science, vol. 285, no. 11, pp. 1287-1291, 2007. 

Polyisoprene-b-polystyrene diblock copolymer cyclohexane Am//a 293-333 K 72GIR... 

Poly(dimethylsiloxane)-b-polystyrene diblock copolymer cyclohexane LLE 163, 173... 

Khandpur, A. K., Foerster, S., Bates, R S., Hamley, I. W, Ryan, A. J., Bras, W, Almdal, K., and Mortensen, K. 1995. Polyisoprene-polystyrene diblock copolymer phase diagram near the order-disorder transition. Macromolecules 28 8796-8806. 

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