Micellar crystals

Fig. 4.10 Temperature dependence of the micellar volume fraction for a 28wt% solution of F88 (PEO,PP039PEO, in D2(), as obtained by Percus-Yevick fits to SANS data (Mortensen 1993f>).The insets show models for the solution structure in the three regimes unimers in solution at low temperature, micellar liquid above the cmt, and at high temperatures a cubic micellar crystal.

Fig. 4.26 Models for the SANS patterns for FCC micellar crystals in Fig. 4.27 (McConnell et al. 1995). (a) Faulted FCC crystal (with equal numbers of FCC and HCP sequences) (b) coexistence between (111) planes (20%) and polycrystalline phase (80%) (c) coexistence between (111) planes (25%) and polycrystalline phase (75%) (d), (e), (f) slipping planes hopping from registry sites with increasing shear-induced flow of layers of micelles. The wavevector range is the same as for Fig. 4.27.

Fig. 11. Schematic representation of fringed-micellar crystals as junctions in a...

These crystalline junction zones are three-dimensional and have a high functionality since each crystal may contain —100 molecules. The conditions which generally favour micellar crystallization rather than... 

Polyolefin-based thermoplastic elastomers (TPEs) have received considerable attention due to their chemical inertness, low density, and low cost compared with other TPEs. Homogeneous ethylene-octene (EO) copolymers, synthesized via contemporary catalyst technology, with low crystallinity and low density (0.86-0.88g/cm ) exhibit the characteristics of thermoplastic elastomers. The elastomeric properties depend on the fringed micellar crystals which serve as network junctions. However, the low melting point of fringed micellar crystals have limited the application of elastic EO copolymers at higher temperatures. 

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