Effect of melt viscosity of polypropylene on fibrillation of thermotropic liquid crystalline polymer in in situ composite film

Wanno, Banchob; Samran, Jareerat; Bualek-Limcharoen, Sauvarop

doi:10.1007/s003970000082

Cited by 29 publications

(22 citation statements)

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“…Polyolefins such as PP and polyethylene (PE) are much interesting to use as the matrix for in situ composite because of their several excellent properties coupled with a low price. Recently, Wanno et al (2000) and Nakinpong et al (2002) have been done on the composite films of various grades of PP and low-density PE, respectively, melt blended with Rodrun LC3000 (a copolyester of 60% HBA/40 mol% PET), emphasizing the effect of processing conditions, viscosity ratio and compatibilizers on the blend rheology, morphology, and mechanical properties. From their works, they found that the mechanical properties, especially in the machine direction and impact strength of the films can be significantly improved by incorporation of TLCP together with a small amount of styrene-based thermoplastic elastomer as compatibilizer.…”

Section: Introductionmentioning

confidence: 99%

Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

Saikrasun

Saengsuwan

2009

Journal of Materials Processing Technology

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Section: Introductionmentioning

confidence: 99%

Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

Saikrasun

Saengsuwan

2009

Journal of Materials Processing Technology

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“…Another advantage is related with the decrease of viscosity, when compared with other reinforced thermoplastics, like, for instance, those with glass fibers. [21][22][23] Nevertheless, in these blends, the LCP and the thermoplastic blends often present a low degree of adhesion, which arise from the fact that, owing to their high aromatic content, LCPs typically have high interfacial tension towards aliphatic polymers. The addition of compatibilizers that promote a decrease of the interfacial tension between the matrix and the dispersed phase, and a better dispersion of the LCP in the matrix, is a strategy to partially overcome this problem.…”

Section: Introductionmentioning

confidence: 99%

“…4,18,22 A novel strategy has appeared recently, 25 in which the blends are prepared in such a way that a finely dispersed cocontinuous morphology is obtained for the blend. This is possible through reactive blending between the component with higher content, to which reactive groups along the backbone were added, and the component with lower content which presents end reactive chains.…”

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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“…Wanno et al 10 studied the influence of the compatibilizer on the morphological properties of polypropylene and Rodrun LC3000. For this purpose, they used three compatibilizers: a tri-block copolymer of styrene (ethylene-butylene) styrene (SEBS), an ethylene-propylene diene monomer (EPDM), and an anhydride maleic-grafted-EPDM (MA-g-EPDM).…”

Section: Introductionmentioning

confidence: 99%

“…As previously described, an extensive number of studies were performed with compatibilized LCP/TP blends. The literature review of this introduction, however, will be essentially focused in systems containing Rodrun LC3000, 10,20,22,27 since this is the liquid-crystalline polymer that is present in the LCP/TP systems in the study.…”

Section: Introductionmentioning

confidence: 99%

Influence of type of compatibilizer on the rheological and mechanical behavior of LCP/TP blends under different stationary and nonstationary shear conditions

Filipe

Maia

Duarte

et al. 2005

J of Applied Polymer Sci

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ABSTRACT:The addition of small amounts of liquidcrystalline polymers to thermoplastics leads to the formation of in situ-reinforced materials, with improved processability and mechanical properties. Nevertheless, the lack of adhesion between the thermoplastic and the liquid-crystalline polymer often occurs, thus requiring the use of compatibilizers. In this case, the results of several previous works show that there is an improvement of strength, usually accompanied by a decrease of toughness and, thus, the interest of LCP/TP blends for industrial applications will certainly increase if both strength and toughness are obtained. Additionally, the emphasis of previous studies has been on the evaluation of the properties of the blend under stationary conditions and not under non-stationary ones, which are, in fact, those most relevant to processing sequences. Thus, the present work focuses on the influence of type of compatibilizer on the mechanical and rheological properties of polypropylene/LCP blends under nonstationary conditions. In terms of mechanical properties, the traditional increase of tensile strength was obtained for all compatibilizers, which was essentially due to the formation, during processing, of thinner and longer fibrils of LCP dispersed in the matrix than those observed for the noncompatibilized blends. Additionally, an improvement of the impact strength and flexural modulus was also observed for the blend in which a compatibilizer with an elastomeric nature was used. Rheologically, the experiments most sensitive to the structure were those performed in transient shear, with an increase of the transient stress (in the form of an overshoot) of different magnitudes being observed for the different compatibilizers.

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Effect of melt viscosity of polypropylene on fibrillation of thermotropic liquid crystalline polymer in in situ composite film

Cited by 29 publications

References 0 publications

Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

Thermal decomposition kinetics of in situ reinforcing composite based on polypropylene and liquid crystalline polymer

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

Influence of type of compatibilizer on the rheological and mechanical behavior of LCP/TP blends under different stationary and nonstationary shear conditions

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