Rheology and morphology of polymer blends containing liquid‐crystalline component in melt and solid state

Куличихин, В. Г.; Васильева, О. В.; Литвинов, И. А.; Антипов, Е. М.; Parsamyan, I. L.; Platè, N.A.

doi:10.1002/app.1991.070420208

Cited by 41 publications

(3 citation statements)

References 13 publications

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“…Such low-swelling factors were noted for certain LC polymers and filled systems [45,46] and, in general, were related either to the existence of a yield point, which prevents stress relaxation and recovery of the elastic strain, or to the presence of a negative first difference of the normal stresses. The formation of fibrous structures in the extrudates was observed earlier in individual LC thermotropic stiff-chain polymers [45,47,48], as well as in incompatible polymer blends containing [49], or not containing, LC polymers [50]. Further, the problem of fiber-formation polymer blends based on PFEPh will be considered in detail.…”

Section: Rheological Properties Of Poly-bis-fluoroalkoxyphosphazenes mentioning

confidence: 93%

Mesophase State of Polyorganophosphazenes

Kulichikhin¹,

Антипов²,

Borisenkova³

et al. 1994

Partially Ordered Systems

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Earlier it was believed [1] that an ordering at a level exceeding the shortrange order of low molecular liquids cannot exist above the melting point in flexible-chain polymers which do not contain meso genic groups. However, recently, a large number of polymers, for example, polyphosphazene, has been found, which cannot be described in the framework of the traditional classification of liquid crystals. An additional type of mesomorphic state, that of a conformationally disordered crystal, was suggested [2,3].A more common approach is analyzing this type of mesophase as a threedimensional ordered crystal having a different perfection extent along each of its crystallographic dimensions. In order to gain a better insight into this problem, it is necessary to accumulate experimental evidence.Polyorganophosphazenes (PPh) with the following general formula:are of interest from the viewpoint of the meso phase class of polymers [4], since many of the representatives of this class may have an ordering level intermediate between a crystalline and an amorphous state in a broad temperature range [5]. A comprehensive review of earlier works on the structure and properties of PPh was published in [6]. The number of publications on the description of the structure, morphology, and characteristics of the physical transitions and physical-mechanical properties of these polymers has considerably increased in recent years. However, there is no complete information on the structure of PPh, especially in the mesomorphous state. V. P. Shibaev et al. (eds.), Liquid Crystalline and Mesomorphic Polymers

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Section: Rheological Properties Of Poly-bis-fluoroalkoxyphosphazenes mentioning

confidence: 93%

Mesophase State of Polyorganophosphazenes

Kulichikhin¹,

Антипов²,

Borisenkova³

et al. 1994

Partially Ordered Systems

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“…The resulting ''molecular composite'' can be regarded as a material in which the rigid crystalline polymers are reinforced at a molecular level. Liquid crystalline polymer blends have been reported for PC [129], [130]; PEI [129]; PP [131]; PBT [132]; PPE -PS [133]; ABS [134]; PSU [135]; PETP [136], [137]; and PA 6 [138]. These blends can be processed by conventional techniques such as extrusion, injection molding, and fiber spinning.…”

Section: New Developmentsmentioning

confidence: 99%

Polymer Blends

Bussink¹,

Grampel²

2000

Ullmann's Encyclopedia of Industrial Chemistry

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The article contains sections titled: 1. Introduction 2. Market Requirements 3. Blend Technologies 3.1. Thermodynamics 3.2. Compatibility 3.3. Compounding 3.4. Reactive Compounding 3.5. Mechanical Properties 3.6. Additives 4. Property and Application Profiles of Selected Blends 4.1. Polyolefins 4.2. Poly(Vinyl Chloride) 4.3. Styrene Polymers and Copolymers 4.4. Polyamides 4.5. Poly(2,6‐Dimethyl‐1,4‐phenylene Ether) 4.6. Polycarbonates 4.7. Polyesters 4.8. Polyetherimides 4.9. Polysulfones 4.10. Polyoxymethylenes 4.11. Polyarylates and Copolyarylate ‐ Carbonate Blends 4.12. Poly(Phenylene Sulfide) 5. General Application Technology 5.1. Processing of Blends 5.2. Design Technology 6. Future Developments 6.1. Recycling 6.2. New Developments 6.3. Outlook 7. Acknowledgement

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“…Allying the properties of the two kinds of polymers seems to be a good strategy for obtaining materials with improved mechanical properties at a reasonable cost. Motivated by this interesting combination, blends of these two kinds of materials have been the subject of intense research in the last 2 decades 1–13…”

Section: Introductionmentioning

confidence: 99%

Experimental results for the rheological and rheo‐optical behavior of poly(ethylene terephthalate)/liquid‐crystalline polymer blends

Cidade

Menon

Leal

et al. 2007

J of Applied Polymer Sci

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The use of thermoplastic/liquid-crystalline polymer (LCP) blends is recognized as a good strategy for reducing viscosity and improving mechanical properties relative to pure thermoplastics. This improvement, however, is only noticeable if the LCP fibrillates, in situ, during processing and the fibrils are kept in the solid state. In this article, we report a morphological, rheological, and rheooptics study performed with two blends of poly(ethylene terephthalate) with a LCP, Rodrun LC3000 (10 and 25 wt % LCP content), and we show that the obtained dropletshape relaxation time (the time the deformed droplet took to regain its spherical form after the cessation of flow) allowed for the explanation of the morphological observations. In fact, the droplet-shape relaxation time was higher for the blend with higher LCP content, for the higher experimentally accessible shear rates, and still increased at the highest shear rate, which explained the fibrils of the LCP dispersed phase observed in this blend, whereas for the lower LCP content blend, the droplet-shape relaxation time reached a low-value plateau for higher shear rates, which explained the absence of fibrillation in this blend.

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Rheology and morphology of polymer blends containing liquid‐crystalline component in melt and solid state

Cited by 41 publications

References 13 publications

Mesophase State of Polyorganophosphazenes

Mesophase State of Polyorganophosphazenes

Polymer Blends

Experimental results for the rheological and rheo‐optical behavior of poly(ethylene terephthalate)/liquid‐crystalline polymer blends

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