Fibres from polypropylene and liquid crystal polymer blends: 2. Effect of extrusion and drawing conditions

Qin, Yijing; Brydon, D. L.; Mather, Robert Rhodes; Wardman, Roger

doi:10.1016/0032-3861(93)90773-4

Cited by 27 publications

(10 citation statements)

References 2 publications

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“…Numerous investigations above mentioned in blend fibers are carried out for the relationships in spinning conditions, fibril morphology and mechanical properties et al [11][12][13][14][15][16][17][18][19][20][21]. And the sizes of fibrils in matrix were micro or sub-micron scale, while nano-scale fibrils were not reported not only in the blend fibers but also in the other kinds of composites.…”

Section: Introductionmentioning

confidence: 98%

“…Sukananta P. et al [14] studied the properties of as-spun and drawn monofilaments of PP/LC5000 in situ composite, and found the significant improvement of both tensile and dynamic mechanical properties, especially in the high temperature region. Qin Y. et al [15][16][17] investigated the fibril morphology and blend fiber mechanical properties affected by concentration, extrusion conditions, drawing conditions and different kinds of LCP. In post-drawing, the LCP fibrils were split into short fragments and the fiber properties were improved with the increase in drawing temperature.…”

Section: Introductionmentioning

confidence: 99%

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In situ gradient nano-scale fibril formation during polypropylene (PP)/polystyrene (PS) composite fine fiber processing

Xing

Zhu

Wang

et al. 2005

Polymer

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

In situ gradient nano-scale fibril formation during polypropylene (PP)/polystyrene (PS) composite fine fiber processing

Xing

Zhu

Wang

et al. 2005

Polymer

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“…The advantages, in terms of processability and mechanical enhancement, are clearly recognized and were intensely studied in all the available works developed in this field (see, for example, the work of Gabellini and Bretas (1996), Qin et al (1993), Wanno et al (2000), ). Several different points were taken into consideration, namely: a) the influence of the LCP content, as studied, for example by and Viswanathan and Isayev (1995); b) the importance of the chemical character of both LCP and thermoplastic on the final properties, as studied by Wano et al (2000), and Qin et al (1993a) and c) the influence of the processing conditions (Heino et al (1994) and Filipe et al (2004) on the mechanical, rheological and morphological properties of the blends.…”

Section: Introductionmentioning

confidence: 98%

A Study of Rodrun LC3000/PP Blends Under Different Stationary and Non-Stationary Shear Conditions: The Influence of LCP Content and Processing Temperature

Filipe

Maia

Leal

et al. 2005

Journal of Polymer Engineering

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Blends containing liquid crystalline polymers and thermoplastics have been a topic of great interest for the scientific community due to their excellent performance and properties and thus, promising use in industrial applications. For that reason, from the eighties until today, these systems were widely studied and characterized in terms of their mechanical, morphological, and rheological properties under stationary conditions but not under non-stationary ones which are, in fact, those most relevant to processing sequences. Thus, despite all the published work on this subject, there is still a need to study the response of the materials under the latter conditions.The transient shear measurements performed on the blends of Rodrun LC3000 and PP showed an overshoot for the transient stress, the magnitude of which increases with increasing LCP content. This overshoot is attributed to the orientation and deformation of the LCP structures. The results obtained for the blends by Large Amplitude Oscillatory Shear, 527 Brought to you by | University of Michigan Authenticated Download Date | 6/17/15 8:58 PM Vol. 25, No. 6, 2005 Rodrun LC3000/PP Blends: Influence of LCP Content and TemperatureLAOS, were revealed to be highly sensitive (compared with those observed in steady shear measurements) not only to the LCP content, but also to the processing temperature. From the rheological point of view an unusual behavior was observed for these systems, which was characterized by an increase of the viscosity and storage modulus with the increase of the LCP content at low frequencies, but a decrease at high frequencies. The traditional

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“…During reactive blending, random graft copolymers are formed and the mixture of these graft copolymers and unreacted backbones (major component) and grafts (minor component) results in thermodynamically stable microstructures. Pernot et al 25 applied this technique to a blend of polyethylene (PE) and polyamide (PA), the funtionalization of the PE obtained by copolymerization, at high pressure and high temperature and using free-radical initiators, of ethylene, ethylacrylate, and maleic anhydride (MAH), while the functionalized PA was synthesized by polycondensation, and was terminated at one end by the reactive functional group NH 2 , and at the other end by a nonreactive group CH 3 . These functionalized groups were chosen to obtain a fast coupling reaction, which is the case between MAH and NH 2 groups.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of compatibilizers and characterization of the compatibilized and noncompatibilized blends of PP/Rodrun LC3000

Cidade

Filipe

Duarte

et al. 2007

J of Applied Polymer Sci

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The addition of a liquid crystalline polymer (LCP) to a matrix of a flexible thermoplastic (TP) has been used in the last two decades as an in situ reinforcement of the matrix. Owing to the immiscibility of the two phases and the high degree of orientation typical of LCPs, the dispersed phase is, after processing, essentially constituted by fibrillar structures, which are responsible for the reinforcement of the matrix and the decrease of viscosity with respect to the matrix. The low degree of adhesion typical of LCP/TP blends often requires the use of compatibilizers, which will act reducing the interfacial tension between the two components. In this work, we present the synthesis of three different compatibilizers, as well as the mechanical characterization of the corresponding compatibilized blends. Some scanning electron microphotographs will be also presented to better explain the mechanical results. The mechanical properties of these blends were compared with the noncompatibilized blend, as well as with the ones presented by blends obtained with two commercial compatibilizers, leading to the conclusion that, considering our compatibilizer C, the one that leads to the higher enhancement of the Young's modulus, when compared with the noncompatibilized blend, we obtain a Young's modulus 27% higher than the one presented by the noncompatibilized blend. Comparing this result with those presented by the blends compatibilized with the two commercial compatibilizers, D and E, we conclude that this enhancement is higher than those presented by those blends (increase in Young's modulus of 16% for both compatibilizers).

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Fibres from polypropylene and liquid crystal polymer blends: 2. Effect of extrusion and drawing conditions

Cited by 27 publications

References 2 publications

In situ gradient nano-scale fibril formation during polypropylene (PP)/polystyrene (PS) composite fine fiber processing

In situ gradient nano-scale fibril formation during polypropylene (PP)/polystyrene (PS) composite fine fiber processing

A Study of Rodrun LC3000/PP Blends Under Different Stationary and Non-Stationary Shear Conditions: The Influence of LCP Content and Processing Temperature

Synthesis of compatibilizers and characterization of the compatibilized and noncompatibilized blends of PP/Rodrun LC3000

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