PS-PI diblock copolymer

Fig. 8. Effect of varying composition on the ordered-phase symmetry in polystyrene-polyisoprene (PS-PI) diblock copolymers [92]...

Fig. 51 Phase diagram for PS-PI diblock copolymer (Mn = 33 kg/mol, 31vol% PS) as function of temperature, T, and polymer volume fraction, cp, for solutions in dioctyl ph-thalate (DOP), di-n-butyl phthalate (DBP), diethyl phthalate (DEP) and M-tetradecane (C14). ( ) ODT (o) OOT ( ) dilute solution critical micelle temperature, cmt. Subscript 1 identifies phase as normal (PS chains reside in minor domains) subscript 2 indicates inverted phases (PS chains located in major domains). Phase boundaries are drawn as guide to eye, except for DOP in which OOT and ODT phase boundaries (solid lines) show previously determined scaling of PS-PI interaction parameter (xodt

Figure 13.4 Phase diagram of a PS-PI diblock copolymer showing regions of BCC spheres (Im3m), hexagonal cylinders (HEX), laid gyroid, hexagonally perforated lamellae (HPL), lamellar (LAM), and disordered phases /pi is the volume fraction of polyisoprene. The dot-dash line represents the mean-field order-disorder transition based on the formula x = 71.4/T — 0.0857 with reference segment volume v — 144 A. (Reprinted with permission from Khandpur et al.. Macromolecules 28 8796. Copyright 1995, American Chemical Society.)...

Figure 13.19 Orientation diagram for PS-PI diblock copolymer atT — 136°C, just below 76dt-The frequencies coc and cod were obtained from linear viscoelastic data they mark the transitions from relatively elastic behavior at high and low frequencies to more dissipative behavior at intermediate frequencies (from Wiesner 1997, reprinted with permission from Hiithig Wepf Verlag.)...

TABLE 11.8 Correlation Between Length of s/Side Chain in PS-PI Diblock Copolymers, Snrface Strnctnre, and Snrface Tension as Obtained by Wang et al. [65]... 

For the qiuescently ordered copolymers, the sensitivity of the low CO modulus to the domain shape has been also utilized to theologically detect morphological transitions. As an example. Figure 36 shows changes of the storage modulus G at (B = 1 s with temperatme observed for a PS-PI diblock copolymer (Mps= 1.0 x 10, Mpi = 5.0 X 10 ). The grain texture of... 

Figure 36 Changes of storage modulus of a PS-PI diblock copolymer (10 /Wps=10.0,10 Mpi = 50.0)at(B = 1 s with temperature. Data taken from Ryu, C. Y. Lee, M. S. Hajduk, D. A. Lodge, T. P. J. Polym. Sci. B. Polym. Phys. 1997, 35, 2811 with permission.

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