Thermoreversible gelation of syndiotactic polystyrene in toluene and chloroform

Daniel, Christophe; Menelle, A.; Brûlet, Annie; Guenet, Jean‐Michel

doi:10.1016/s0032-3861(96)01005-1

Cited by 101 publications

(108 citation statements)

References 23 publications

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“…This compound consists of solvated chains, where the solvent is housed within the cavities created by the protruding phenyl groups [10] . As has been observed from neutron scattering experiments on iPS/ cis-decalin gels [11] (see Figure 5) but also on sPS/benzene and sPS/toluene gels [12,13] , the originally flexible chains become more rigid. In the case of iPS/cis-decalin gels it has been shown that their persistence length increases from l p ¼ 1 nm to l p ¼ 4 nm.…”

Section: Introductionsupporting

confidence: 57%

Microfibrillar Networks: Polymer Thermoreversible Gels vs Organogels

Guenet

2006

Macromolecular Symposia

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Section: Introductionsupporting

confidence: 57%

Microfibrillar Networks: Polymer Thermoreversible Gels vs Organogels

Guenet

2006

Macromolecular Symposia

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“…Marubayashi et al 3,4) reported that PLLA forms complex crystals with some solvents including N,N-dimethylformamide (DMF), and designated these crystals as "ε-crystal". Guenet, Daniel and their coworkers [5][6][7][8] reported that syndiotactic polystyrene also form complex crystals with some solvents such as 1,2-dichloroethan and 1-chloropropane, and gels in these solvents.…”

Section: Introductionmentioning

confidence: 99%

Flow Temperature of Poly(Lactic Acid) Gel in Solvents with Different Solubility

Matsuda

Fukui

Iwase

et al. 2018

J. Soc. Rheol., Jpn

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Poly(L-lactid acid) (PLLA) forms complex crystals (ε-crystal) with some solvents including N,N-dimethylformamide (DMF), and can be easily gelled in such solvents. The solvent of these gels can be exchanged to some other solvents which do not form ε-crystal with PLLA. The flow temperatures of PLLA gels after exchanging DMF to various solvents were investigated to clarify the relation between the exchangeability and the solubility of solvents to PLLA. After changing the ε-crystals to α-crystals (crystal form of PLLA in films without special treatments) by immersing the gels into 1-propanol, the flow temperatures of PLLA gels could be expected by Hansen solubility parameters. The results suggest that the exchangeability of the solvent of the PLLA gel is determined both by the solubility to PLLA and the ability of the new solvent to induce the change from ε-crystals to α-crystals.

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“…Subsequently, the phase diagrams of these polymer-solvent systems, thus established, exhibited the liquidus and solidus lines, showing crystalline phases of PS and/or its modifica tions such as crystallo-solvates, in which the solvent molecules were trapped in the PS crystals [63][64][65]. The experimental evidence has led to the suggestion of possible entrapment of solvent in polymer crystals, forming solvated crystals [63].…”

Section: Flory Diluent Theorymentioning

confidence: 93%

Phase Field Modeling on Polymer Crystallization and Phase Separation in Crystalline Polymer Blends

Kyu

Tai-ming

et al. 2010

Encyclopedia of Polymer Blends

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The solidification phenomenon of a liquid has been one of the most fascinating firstorder phase transitions, involving a complex interplay of many physical effects. The simplest solidification front is the planar interface. Usually, the solid-liquid interface is an active free boundary from which latent heat is liberated during solid-liquid phase transformation. Preferentially, this latent heat is conducted away from the convex solid-liquid tips, but it may be trapped in the case of concave interface, thereby leading to the directional growth of interfacial morphologies. Consequently, these interfaces are generally rough with convex and concave curvatures. Among them, the basic patterns are dendrites and seaweeds. A structure with pronounced orientational order is termed as dendrite, and without apparent orientational order it is called seaweed. The dendritic shape is a symmetric needle crystal with a parabolic tip, the sides of which are influenced by a secondary branching. The seaweed morphology was originally introduced on the basis of experimental observations under the name of dense-branching morphology, which is characterized by repeating tip splitting at the interface front [1]. The basic element of the seaweed structure is a doublon, which consists of two fingers with a liquid channel running along the axis of the symmetry between them. Experimentally, Akamatsu[2] showed that the seaweed growth involves a continual creation and elimination of doublons. In directional solidification, the solid-liquid interface is subjected to morphological instabilities in an externally imposed directional temperature gradient. Various interface morphologies have been observed [2-4] depending on the physical properties of the materials. Especially, the anisotropic properties of the solid-liquid interface play a particularly important role in deter mining the stability of the dendrites as well as the transformation between seaweed and dendrite patterns. Thus, an in-depth understanding of the interface morphology during solidification is essential to shed light on the pattern formation aspects of crystal solidification.Theoretical investigations of the solid-liquid phase transition have long been the subject of considerable interest. Among these, there are two main streams: one is the Edited by Avraam I. Isayev

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Thermoreversible gelation of syndiotactic polystyrene in toluene and chloroform

Cited by 101 publications

References 23 publications

Microfibrillar Networks: Polymer Thermoreversible Gels vs Organogels

Microfibrillar Networks: Polymer Thermoreversible Gels vs Organogels

Flow Temperature of Poly(Lactic Acid) Gel in Solvents with Different Solubility

Phase Field Modeling on Polymer Crystallization and Phase Separation in Crystalline Polymer Blends

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