Rheooptical Studies of Racemic Poly(γ-benzyl glutamate) Liquid Crystals

Asada, Tadahiro; Muramatsu, Hiromochi; Watanabe, Ryoji; Onogi, Shigeharu

doi:10.1021/ma60076a019

Cited by 64 publications

(31 citation statements)

References 2 publications

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“…Some investigators have become aware of the necessity of rheo-optical studies to carify the relation between rheological properties and structure. Some of them (25,42,49) observed flow process directly with a microscope, and others (11,13,24,36,37,51) measured optical quantities simultaneously with rheological properties.…”

Section: Rero-optical Properties Of Polymer Liquid Crystalsmentioning

confidence: 99%

“…The authors (11,13,36,37,50,51) also developed new rheooptical techniques and have investigated the relation between structure and rheological properties of various liquid crystals. In this section, some results of our recent works are introduced.…”

Section: Rero-optical Properties Of Polymer Liquid Crystalsmentioning

confidence: 99%

“…Measurements (11,36,37,50,51) The rheo-optical techniques developed by us are spectrophotometry and polarized-light techniques. The former enables us to measure the wave-length dependence of transmitted light intensity and rheological properties simultaneously.…”

Section: Rero-optical Properties Of Polymer Liquid Crystalsmentioning

confidence: 99%

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Rheology and Rheo-Optics of Polymer Liquid Crystals

1980

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Section: Rero-optical Properties Of Polymer Liquid Crystalsmentioning

confidence: 99%

Section: Rero-optical Properties Of Polymer Liquid Crystalsmentioning

confidence: 99%

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Rheology and Rheo-Optics of Polymer Liquid Crystals

1980

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“…The block length of the p(Bz-LGlu) block was kept at 20 repeat units, and the length of the p(L-Leu) was varied between 10 and 20 repeat units. It has been known from literature [57] that p(Bz-L-Glu) is a rigid polymer chain, which is able to form liquid crystalline structures. Both facts, the mutual immiscibility of the blocks and the self-assembly of p(Bz-L-Glu), led to the formation of a microphase separated micelle core.…”

Section: Micellization Aggregationmentioning

confidence: 99%

Synthesis and structure formation of block copolymers of poly(ethylene glycol) with homopolymers and copolymers of l-glutamic acid γ-benzyl ester and l-leucine in water

et al. 2015

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Block copolymers consisting of blocks of poly(amino acid)s (PAAs) derived from naturally occurring L-amino acids and biocompatibilizing poly(ethylene glycol) (PEG) are of interest for biomedical applications because of their compatibility, partial degradability, and, depending on their molecular architecture, unique self-assembly behavior. PEGylated PAAs were synthesized by α-methoxy-ω-amino PEG-initiated ring-opening polymerization, ROP, of the Ncarboxyanhydrides, NCAs, of L-leucine and L-glutamic acid γ-benzyl ester. The molecular weights of the resulting di-and triblock copolymers were well controlled with narrow polydispersities, and the block copolymers were obtained in high yields (>90 %). PEGylated PAA diblock copolymers with a copolymer block of PAAs were obtained when the amino acid NCAs were polymerized as a mixture and triblock copolymers with two PAA hompolymer blocks resulted from the successive addition of the respective NCAs. Dynamic light scattering indicated that these block copolymers self-assemble when exposed to a selective solvent into micelles with hydrodynamic radii between 7 and 10 nm, which aggregate into larger structures with radii ranging between 27 and 40 nm. The coexistence and sizes of the two types of particles were corroborated by small-angle neutron scattering analyses. A detailed analysis of the micelle core structures by transmission electron microscopy suggests that the cores of the micelles do not form perfect spheres and thereby enable their continued aggregation, which is further aided by the immiscibility and subsequent phase separation of poly(L-glutamic acid γ-benzyl ester) and poly(L-leucine) blocks that constitute the PAA block.

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“…Rheooptics has been used to study, among many other phenomena, the ubiquitous shear-induced periodic banded textures [2,8,[12][13][14][15][16][17][18][19][20][21] observed when observing the sample between cross-polars. This phenomenon reflects the complexity of shearinduced instabilities and has been analyzed using molecular and macroscopic models [3,11,[22][23][24][25][26][27][28][29][30] and given the amount of theoretical and experimental data is a good test problem to validate and refine computational rheooptical models and will be used in this paper.…”

Section: Introductionmentioning

confidence: 99%