Effects of filler type and mixing method on the physical properties of a reinforced semirigid liquid crystal polymer

Scaffaro, R.; Pedretti, U.; Mantia, Francesco Paolo La

doi:10.1016/0014-3057(96)00009-2

Cited by 21 publications

(12 citation statements)

References 11 publications

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“…The result also indicated that the Fe 3 O 4 NPs played an important role in the downtrend of E and σ b . In recent years, some factors had been considered to analyze the properties of composites (e.g., molecular mass of polymeric matrix and concentration, species shape, size of fillers, and mixing method) . In our system, molecular mass of PCL matrix and concentration of Fe 3 O 4 has also been used to explain the above results.…”

Section: Resultsmentioning

confidence: 99%

Influence of in Vitro Degradation of a Biodegradable Nanocomposite on Its Shape Memory Effect

Zhou

Zheng

et al. 2009

J. Phys. Chem. C

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Preparation and in vitro degradation of shape memory nanocomposites consisting of cross-linked poly(εcaprolactone) (c-PCL) and Fe 3 O 4 nanoparticles were investigated in this study. The degradation behaviors were evaluated from the decrease of mechanical property, weight, and molecular weight of polymer, the change of pH value of phosphate-buffered saline (PBS), and morphological changes in composites. The results from gel fraction and molecular weight analysis indicated some damages were brought to chemical networks of c-PCL, but its linear molecule configuration received less impact from PBS degradation medium. Expectedly, the negative influence of the in vitro degradation on shape memory effect had been observed. All these physical and chemical properties related to degradation had been tested to analyze degradation behaviors, which were further used to explain the changes in shape memory recovery. Furthermore, on the basis of the degradation results, the mechanism of c-PCL degradation was also put forward to illustrate the effect of degradation on shape memory. This research will supply a guideline for effectively using and preserving biodegradable shape memory composites.

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Section: Resultsmentioning

confidence: 99%

Influence of in Vitro Degradation of a Biodegradable Nanocomposite on Its Shape Memory Effect

Zhou

Zheng

et al. 2009

J. Phys. Chem. C

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“…It is known that inorganic reinforcements increase the viscosity of thermoplastics 3, 25, 26. This adverse effect can be overcome by the addition of an LCP, which in hybrid composites may decrease viscosity to values even lower than that of the pure thermoplastic 25–28.…”

Section: Resultsmentioning

confidence: 99%

“…On filling LCPs, a more homogeneous orientation within the sample cross section,6 and a loss of coarse structure in the moldings5 without substantial loss in molecular orientation, were reported. Their behavior did not depend on the nature of the filler, and the reinforcement was better with fibers than with particulates because of the higher aspect ratio of the former 3. No significant differences were obtained between the properties of LCPs filled with glass or carbon fibers 4, 22…”

Section: Introductionmentioning

confidence: 96%

“…However, they have some disadvantages,2 such as poor weld strength, weak surface (creating fibrils by rubbing), and strong anisotropy in mechanical properties. The use of fillers in LCPs increases the viscosity3, 4 and decreases the tensile strength 2, 5, 6. However, the filled LCPs show increases in the flexural and tensile modulus, and in thermal endurance associated with incorporation of inorganic fillers, and the required properties of the LCP materials can be promoted while minimizing the unwanted ones 2, 3…”

Section: Introductionmentioning

confidence: 99%

“…In most studies, the inorganic reinforcement was added as a third component,23–32 but fiber‐reinforced matrices, such as glass fiber–reinforced poly(ether imide) (PEI)33 or PES,34 have also been used. There are many studies of filled LCPs2–6, 22, 35–37 and filled thermoplastic/LCP blends23–33; however, to our knowledge there is no study of thermoplastic/filled LCP composites.…”

Section: Introductionmentioning

confidence: 99%

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Processability and mechanical performance of hybrid composites based on poly(ether sulfone) modified with a glass fiber–reinforced liquid crystalline polymer

García¹,

Eguiazábal²,

Nazábal³

2003

J of Applied Polymer Sci

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Hybrid composites, based on poly(ether sulfone) (PES) and glass fiber-reinforced copolyester liquid crystalline polymer (gLCP) up to 40% gLCP, were obtained by injection molding: these polymers were immiscible. Despite its higher viscosity, the gLCP acted as a processing aid for PES. The Young's modulus of the composites increased linearly with gLCP content, attributed to the opposing effects of increasing skin thickness and decreasing orientation of the fibrillated LCP in the skin. The break properties decreased with increasing gLCP content, mainly because of the lack of adhesion between the phases. The notched impact strength increased substantially on addition of 10% gLCP, suggesting that the dispersed rigid particles changed the fracture behavior of PES. The composite with 10% gLCP appeared to be the most attractive because it showed an increase in stiffness of 18%, 6.5-fold impact strength, and a tensile strength similar to that of PES.

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Influence of fillers on the mechanical response of an amorphous liquid‐crystalline polymer

Guerrica-Echevarría

Eguiazábal

Nazábal

2003

J of Applied Polymer Sci

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A semirigid and amorphous commercial liquid-crystalline copolyester (Rodrun) was filled with mica and calcium carbonate (up to 25 wt %) by direct injection molding. The fillers led to decreases in the processability, as observed by torque increases, but maintained the thermal resistance of Rodrun. The effects of the two fillers on the modulus of elasticity, ductility, and tensile strength were the same or very similar. The decrease in the tensile strength (20% for a 10% filler content) was compensated by a generally slight increase in the modulus of elasticity, whatever the filler content was. This balance of properties found in these new liquid-crystalline-polymer-based materials and the important savings that the fillers bring may spread the applications of these materials' matrices.

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Effects of filler type and mixing method on the physical properties of a reinforced semirigid liquid crystal polymer

Cited by 21 publications

References 11 publications

Influence of in Vitro Degradation of a Biodegradable Nanocomposite on Its Shape Memory Effect

Influence of in Vitro Degradation of a Biodegradable Nanocomposite on Its Shape Memory Effect

Processability and mechanical performance of hybrid composites based on poly(ether sulfone) modified with a glass fiber–reinforced liquid crystalline polymer

Influence of fillers on the mechanical response of an amorphous liquid‐crystalline polymer

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