Honeycomb morphology

Widawski G, Rawiso M, Francois B (1994) Self-organized honeycomb morphology of star-polymer polystyrene films. Natnre 369 387... 

The impact behaviour of HDPE/iPP (75/25) binary blend is of brittle nature with no stress whitening phenomenon. As shown in the SEM micrograph of Fig. 7a, the fractured surface of this binary mixture exhibits a "honeycomb morphology with evidence of dispersed particles (iPP) enclosed in the cells. Furthermore, there seems to be very negligible adhesion between the matrix and the dispersed phase. This observation accounts for the lower impact strength values compared with those obtained for the pure homopolymers. 

Lin, C.L., Tung, P.H., Chang, F.C. Synthesis of rod-coil diblock copolymers by ATRP and their honeycomb morphologies formed by the breath figures method. Polymer 46, 9304-9313 (2005)... 

Francois, B., Pitois, O., Francois, J. Polymer films with a self-organized honeycomb morphology. Adv. Mater. 7, 1041-1044 (1995)... 

As described previously, micelle formation by evaporating CS2 resulted in regular pores arranged in a hexagonal array. This honeycomb morphology discovered by Francois and Zhong was made from rod-coil PPP-I7-PS copolymer 1 (Figure Similarly, de Boer et reported a honey-... 

The honeycomb morphology could also be reproduced by Francois et and Olinga and Frangois with block... 

Figure39 SEM image of two-dimensional hexagonal arrays of aluminum dots obtained by evaporation of aluminum on the honeycomb morphology build by polystyrene-block-poly(2,5-dioctyloxy-p-phenylene vinylene). (Reprinted from B. de Boer, U. Stalmach, H. Nijiand, and G. Hadziioannou. Adv. Mater. 12 1581, 2000. Copyright [2000] Wiley-VCH. With permission.)... 

In a rod-coil block copolymer with poly(propylene oxide) as the coil segment and a slightly elongated rod segment (4Cbiphenylcarboxy-4 -biphenyl-4-n-propyloxybenzoate) the already mentioned honeycomb morphology (see Figure 49) was found as well [168]. 

Formation of two-dimensional honeycomb morphology has been observed in the solvent evaporation of copolymers [109-111] and fluorinated silver nanoparticles [112]. In these systems, water droplets condensed from moisture on the evaporating solutions act as the template to direct formation... 

FIGURE 16. CAA oxide after immersion in water at 100°C for (a) 24 h and (b) 72 h. Note the development of crystallites concurrent with the disappearance of the honeycomb morphology. (R-om Reference 58.)... 

Figure 33 Scanning electron mica-ograph of polystyrene-block-poly(/>ara-phenylene) (respective molecular weights 30.000 and 7.000 g/mol) (a) side view (b) plan view and (c) micrograph of a monolayer of pores in the copolymer fihn. Atomic force microscopy also manifests the honeycomb morphology (d). (Reprinted by permission from Ref. 99, copyright 1994, Macmillan Magazines Ltd.)...

Formation of two-dimensional honeycomb morphology has been observed in the solvent evaporation of copolymers [90-94], fluorinated silver nanoparticles [95] and also for carbon nanotubes [96[. In these systems, water droplets condensed from moisture on the evaporating solutions act as the template to direct formation of the honeycomb patterns. Similar mechanisms would be involved in the present system, where the rigid coordination chains formed dming the solvent evaporation stabihze the stereohoneycomb architectures. A recent report also indicates the importance of rigid polymer structures in the formation of double-layered honeycomb structiu e [97,98]. 

Self-organized honeycomb morphologies [60] have recently been identified with well-defined hompol)mieric star-shaped PS (or on polydisperse starshaped polymers or copol)miers). That morphology was observed first on poly-st5n-ene-polyparaphenylene block copolymers and may be attributed for linear or branched polyst)n-enes to the specific behavior of PS in carbon disulfide [61]. 

Figure 28 Scanning electron micrograph of a star polystyrene film showing the honeycomb morphology. (From Ref 90.)...

---