Knitting pattern

Fig. 53 Different possible scenarios during formation of knitting pattern morphology. Upper row. PEB is microphase separated, PS and PMMA are still dissolved in chloroform lower row. final morphology after removal of solvent. From [166], Copyright 2001 American Chemical Society... 

Breiner U, Krappe U et al (1996) Evolution of the knitting pattern morphology in ABC triblock copolymers. Macromol Rapid Commun 17 567-575... 

Different knitting patterns can be tailored to requirements of directional elongation and stability. The disadA ntages of this process of making a fabric include the following ... 

Figure 10 Examples for phase segregate microstructures in ABC triblock copolymers. Transmission electron micrograph and schematic three dimensional representation of (a) the knitting pattern morphology [107], Reproduced from [107] with permission of Huthig Wepf Verlag.

Figure 4.2.1 Common natural alditols. First row R- and D- glycerolaldehydes, second row R- and D-ribose third row D-tetroses fourth row D-pentoses fifth row D-hexoses together with a mnemonic rule for Americans. This sentence will help to memorize the sequence of D-hexose names, which are built up in the carbohydrate knitting pattern (C5) eight right, this establishes the D series (C4) four right-four left (C3) two right-two left and (C2) one right-one left. sixth row various formulas for D-ribose and D-glucose. For furanose and pyranose hemiacetals, see Figure 4.2.8.

Fig. 4.2 (a) Transmission electron micrograph of a polystyrene-block-poly(ethylene-co-butyl-ene)-block-poly(methyl methacrylate) (SEBM) triblock copolymer, stained with RUO4, presenting the morphology called the knitting pattern. Bar = 0.5 pm. (b) Schonatic description of the triblock chain conformation within the unit cell. Adapted with pmnission from ref. [32], Macromolecules 1998, 31, 135. Copyright 1998 American Chemical Society... 

Breiner, U., Krappe, U., Thomas, E.L., Stadler, R. Structural characterization of the knitting pattern in polystyrene-block-poly(ethylene-co-butylene)-block-poly(methyl methacrylate) triblock copolymers. Macromolecules 31, 135 (1998)... 

LDPE ILow Density Polvethvlenel Polyethylene plastic having a density typically between 0.910 and 0.925 g/cm. The ethylene molecules are linked in random fashion, with the main chains of the polymer having long and short side branches. The branches prevent the formation of a closely knit pattern, which results in a soft, flexible and tough material. 

Batten, S. R., Hoskins, B. F., and Robson, R., 3D knitting patterns. Two independent, interpenetrating rutile-related infinite frameworks in the. structure of ZnfC(CN)d2. Chem. Commim., 445-447 (1991). 

Figure 13.17 Polystyrene-Woc/c-poly(ethylene-sfaf-butylene)-Woc/c-poly(methyl methacrylate) bright field transmission electron micrograph, sample stained with RUO4. Note knitting pattern.

Breiner et al. (36) studied the so-called knitting pattern found for the triblock copolymer polystyrene-h/ock-poly(ethylene-5 tot-butylene)-h/c c -poly(methyl methacrylate) see Figure 13.17. [The poly(ethylene-5 tflt-buty-lene)-component was formed by hydrogenating the original polybutadiene block, which contained some 1,2-placements as well as the more usual 1,4-placements.] In this morphology, poly(methyl methacrylate) forms peristaltic lamellae in which opposite maxima and minima are spanned by ellipsoidalshaped cylindrical poly(ethylene-co-butylene). Of course, such complexity arises from the combined need of the chains to be able to wander from domain... 

Figure 13.18 Triphase knitting pattern morphology, illustrating the chain conformation within...

Figure 11 Polysty rene-block-poly(ethylene-co-butylene)-block-poly(methyl methacrylate) S-EB-M showing the knitting pattern morphology, (a) Transmission electron micrograph stained with RUO4 (S appears dark, M and EB appear light), (b) Scheme. (From U. Breiner et al. Macromol. RapidCommun. 17 567, 1996, Copyright 1996 Wiley-VCH Verlag GmbH, Weinheim.)...

S-B-M triblock terpolymer shows a lamellar morphology, the analogous S-EB-M self-organizes into the so-ealled knitting pattern morphology [160-162] (Figure 11). 

Also blends of two triblock terpolymers have been studied, in which just the middle block differs in length. While in the case of two S-B-T triblock terpolymers a noncentrosymmetric superlattice was found [148], a blend of two S-B-M triblock terpolymers showed a knitting pattern morphology similar to the one shown in Figure 11 [246]. 

Figure 18.13 TEM images and models of (a) the knitting pattern kp) and (b) barber pattern hoc) in PS-PEB-PMMA. ((a) Reprinted with permission from H. Ott, V. Abetz and V. Altstadt, Morphological studies of poly(styrene)-block-poly(ethylene-co-butylene)-block-poly(methyl methacrylate) in the composition region of the knitting pattern morphology, Macromolecules, 34, 7, 1069-1075, 2001. 2001 American Chemical Society, (b) Reprinted with permission from U. Krappe, R. Stadler and I. Voigt-Martin, Chiral assembly in amorphous ABC triblock copolymers. Formation of a helical morphology in polystyrene-block-polybutadiene-block-poly(methyl methacrylate) block copolymers, Macromolecules, 28, 13, 4558-4561, 1995. 1995 American Chemical Society.)...

Ott, H., Abetz, V., and Altstadt, V. (2001) Morphological studies of poly(styrene)-WocA -poly(ethylene-co-butylene)-h/oc -poly(methyl methacrylate) in the composition region of the knitting pattern morphology. Macromolecules, 34,2121-2128. 

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