On the crystallization behavior of frustrated alkyl groups in poly(n-octadecyl methacrylate)

Hempel, E; Budde, H.; Höring, S.; Beiner, Mario

doi:10.1016/j.jnoncrysol.2006.01.131

Cited by 45 publications

(73 citation statements)

References 36 publications

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“…These transitions are tentatively assigned to the melting and crystallisation of portions of the octadecyl chains in the aggregates. 8 The structure and the thermal behaviour of these aggregates was further investigated with cryoTEM and cryo-electron tomography (cryoET -3D cryoTEM). The 2D cryoTEM projection images of the 5wt% solution vitrified 4C showed numerous round aggregates that possessed an ordered internal microphase-separated structure (Fig.…”

Section: Temperature Responsive Nanospheres With Bicontinuous Internamentioning

confidence: 99%

Temperature-Responsive Nanospheres with Bicontinuous Internal Structures from a Semicrystalline Amphiphilic Block Copolymer

et al. 2010

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Internally structured self-assembled nanospheres, cubosomes, are formed from a semi-crystalline block copolymer, poly(ethylene oxide)-block-poly(octadecyl methacrylate) (PEO39-b-PODMA17), in aqueous dispersion. The poly(octadecyl methacrylate) block provides them with a temperature responsive structure and morphology. Using cryo-electron tomography, we show that at room temperature these internally bicontinuous aggregates undergo an unprecedented order-disorder transition of the microphase separated domains that is accompanied by a change in the overall aggregate morphology. This allows switching between spheres with ordered bicontinuous internal structures at temperatures below the transition temperature and more planar oblate spheroids with a disordered microphase-separated state above the transition temperature. The bicontinuous structures offer a number of possibilities for application as templates e.g. for biomimetic mineralisation or polymerization. Furthermore, the unique nature of the thermal transition observed for this system offers up considerable possibilities for their application as temperature-controlled release vessels. Amphiphilic AB and ABA block copolymers have been demonstrated to form a variety of self-assembled aggregate structures in dilute solutions where the solvent preferentially solvates one of the blocks. Temperature responsive nanospheres with bicontinuous internal structures from a semi-crystalline amphiphilic block copolymer1 The most common structures formed by these amphiphilic macromolecules are spherical micelles, cylindrical micelles and vesicles (polymersomes), with the type of aggregate depending principally upon the relative volumes of the different blocks.1 Over the past decade more complex aggregate structures have been observed and targeted for construction. The majority of these aggregates (such as disk-like and toroidal micelles) may be grouped under the description of complex micelles and can be achieved both through manipulating block copolymer structures and through physical means.2 Multicompartment micelles are typically the result of ABC block copolymers, of which one of the blocks is solvophilic and the remaining two are solvophobic but do not mix.3 Hence microphase separated micellar cores result.We recently reported the experimental observation of complex micelles with bicontinuous hydrophilic/hydrophobic internal structures from amphiphilic norbornene-based double-comb diblock copolymers, with peptide and oligo(ethylene oxide) side chain.4 Block copolymer nanoparticles with similar bicontinuous phase separation have also been observed by Wooley et al, 5 and before that were predicted by Fraaije and Sevink. 6 In the present paper we demonstrate the formation of similar complex micelles, with hydrophobic bicontinuous internal morphologies from an amphiphilic semi-crystalline AB(C) comb-like block copolymer. Using cryo-electron tomography, we show that at room temperature these internally structured nanoparticles undergo an unprecedented order-disorder transiti...

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Section: Temperature Responsive Nanospheres With Bicontinuous Internamentioning

confidence: 99%

Temperature-Responsive Nanospheres with Bicontinuous Internal Structures from a Semicrystalline Amphiphilic Block Copolymer

et al. 2010

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“…Otherwise, the constrains by the methacrylate backbone are still remarkable so that only one-third of the CH 2 units in the alkyl group can crystallize easily. 15 n-Octadecanoic acid has a chemical structure similar to that of the side chain of the polymer and crystallizes at a temperature higher than the crystallization temperature of POMA. DSC studies of the polymers indicated that their alkyl side chains could crystallize in the same order as that of the neat polymer.…”

Section: Introductionmentioning

confidence: 99%

Structural and thermal behavior of comb‐like polymer having n‐octadecyl side chains

Saikia

Baruah

2007

J of Applied Polymer Sci

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The cocrystallization behavior of poly(n-octadecyl methacrylate) (POMA) and its blends with corresponding fatty acid (n-octadecanoic acid) (C 18 ) was explored by differential scanning calorimetry (DSC) and X-ray diffraction studies. The DSC curves for blended samples of POMA with C 18 show the characteristic melting endotherms that correspond to the melting of the cystallites. The existence of hexagonally packed crystalline lattice is confirmed from the X-ray diffraction studies. Thermal degradation of the polymer and its blend proceeds in a one-step reaction.

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“…These peaks were from the crystalline structure of long perfluoroalkyl and octadecyl side chains [44,62]. The dif- Q is fluorine enrichment factor, the ratio of surface to bulk fluorine concentrations.…”

Section: Resultsmentioning

confidence: 99%

Studies on the effects of the alkyl group on the surface segregation of poly(n-alkyl methacrylate) end-capped 2-perfluorooctylethyl methacrylate films

Yang

Yuan

Zhou

et al. 2011

Journal of Colloid and Interface Science

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On the crystallization behavior of frustrated alkyl groups in poly(n-octadecyl methacrylate)

Cited by 45 publications

References 36 publications

Temperature-Responsive Nanospheres with Bicontinuous Internal Structures from a Semicrystalline Amphiphilic Block Copolymer

Temperature-Responsive Nanospheres with Bicontinuous Internal Structures from a Semicrystalline Amphiphilic Block Copolymer

Structural and thermal behavior of comb‐like polymer having n‐octadecyl side chains

Studies on the effects of the alkyl group on the surface segregation of poly(n-alkyl methacrylate) end-capped 2-perfluorooctylethyl methacrylate films

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