Mechanical performance of blends of thermotropic liquid crystalline polymer spheres‐dispersed polycarbonate

Xue, Yongfu; Zhang, Jun; Zheng, Xuejing; He, Jiasong

doi:10.1002/app.12166

Cited by 4 publications

(4 citation statements)

References 33 publications

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“…It fractured in the character similar to that of rigid‐particle‐filled systems. As reported in our previous article,37 a dispersed LCP phase [a random copolyester of HBA and poly (ethylene terephthalate)] was mainly in the form of spherical droplets in the PC composites. This kind of composite exhibited a yield point and some plastic deformation before final fracture, especially when the interphase between the two components was improved by the addition of a proper amount of compatibilizer.…”

Section: Resultssupporting

confidence: 57%

“…Based on our previous studies on the PC composites with sphere‐dispersed LCP phase,37 the increment of core layer thickness and the heterogeneous distribution of more LCP in the core should have benefitted from the toughness improvement of hybrid composite if the poor adhesion between the LCP and PC matrix was improved. The addition of an appropriate compatibilizer into the blends containing LCP can achieve this goal and benefit from the toughing effects of dispersed LCP phase 42, 43.…”

Section: Resultsmentioning

confidence: 99%

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A gradient structure formed in injection‐molded polycarbonate in situ hybrid composites and its corresponding performances

Zhang

2004

J of Applied Polymer Sci

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Three polycarbonate (PC) composites that were reinforced, respectively, with liquid crystalline polymer (LCP), glass fibers, and both of them were prepared by a single injection-molding process. The role of LCP in improving the processibility of the composites was characterized by torque measurement test. The transitions of LCP morphology in two-and three-component composites were investigated by using polarizing optical microscopy and scanning electron microscopy. The micrographs showed a skin-core gradient structure in all three systems investigated, and the addition of glass fiber to the PC/LCP blend affected the morphological transition and content distribution of dispersed LCP phase through the thickness of the injection-molded samples. These results were correlated well with the measurements of tensile mechanical properties and dynamic mechanical analysis. How to fully use the dispersed LCP phase in PC in situ hybrid composites was discussed for the thickness change of core layer and the heterogeneous distribution of more LCP in the core. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: [625][626][627][628][629][630][631][632][633][634] 2004

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Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

A gradient structure formed in injection‐molded polycarbonate in situ hybrid composites and its corresponding performances

Zhang

2004

J of Applied Polymer Sci

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“…When 5 wt % SMA was added, tensile strength increases from 24.8 to 44.0 MPa; interaction parameter increased from −0.06 to 15.32 and adhesive strength from 0.62 to 42.74, indicating better interfacial adhesion at the presence of compatibilizer. Another work in our laboratory showed that SMA could also improve the ability to absorb fracture energy of polycarbonate/LCP blends 43. All the above‐mentioned results show that SMA is an effective compatibilizer for blends containing polyamide and polyester, no matter the dispersed phase is an elastomer or plastic.…”

Section: Resultsmentioning

confidence: 84%

Compatibilization of nylon 6/liquid crystalline polymer blends with three types of compatibilizers

Zheng

Zhang

2002

J of Applied Polymer Sci

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Polyblends of nylon 6 and liquid crystalline polymer (LCP) (Vectra A 950) are immiscible and highly incompatible, with resultant poor interfacial adhesion, large phase domains, and poor mechanical properties. In the present work, compatibilizing strategies are put forward for blends containing nylon and LCP. Effects of three types of compatibilizers, including ionomer Zn-sulfonated polystyrene (SPS), reactive copolymer styrene-maleic anhydride (SMA), functional grafted copolymers-polypropylene grafted glycidyl methacrylate (PP-g-GMA) and polypropylene grafted maleic anhydride (PP-g-MAH)-are studied in the aspects of morphology and dynamic mechanical behavior. The addition of compatibilizers decreases the domain size of the dispersed phase and results in improved interfacial adhesion between LCP and matrix. The compatibilization mechanism is discussed by way of diffuse reflectance Fourier transform spectroscopy (DRIFT), showing the reaction between compatibilizers and matrix nylon 6. Mechanical properties are improved by good interfacial adhesion. The contribution of SMA to mechanical properties is more obvious than that of Zn-SPS and grafted PPs used. The blending procedure is correlated with the improvement of mechanical properties by the addition of compatibilizer. Two-step blending is demonstrated as an optimum method to obtain composites with better mechanical properties as a result of a greater chance for LCP to contact the compatibilizer.

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“…The remaining solution containing the LCP residue was then centrifuged so that the residue could be collected and dried [19,20]. The residues were then coated with gold and prepared for observation under the scanning electron microscope (SEM).…”

Section: Characterizationmentioning

confidence: 99%

Phase Diagram for Predicting In Situ Fibrillation of LCP During Molding

Tan

Yue

et al. 2006

Materials and Manufacturing Processes

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The present work represents an important attempt at constructing a phase diagram for predicting the type and extent of fibrillation of the liquid crystalline polymer (LCP) phase in LCP-based polymer blends. A polycarbonate (PC)/LCP polymer blend was utilized in the current study. The combined effects of three factors, namely, the shear rate, the LCP content in the blend, and interfacial adhesion between the LCP phase and the matrix polymer (PC) were considered. In contrast, work in reported literature has usually considered the individual effect of only one or at most two of these three factors. A thermotropic liquid crystalline polymer, LC5000, consisting of 80/20 of hydroxybenzoic acid and poly(terephthalate) was employed. The effect of interfacial adhesion between the LCP and the PC matrix on fibrillation was considered by using a compatibilizer for the PC/LCP blend. It was demonstrated that the constructed phase diagram could successfully be used to predict and illustrate the conditions under which in situ fibrillation of the LCP phase would occur in the LCP-based blend.

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Mechanical performance of blends of thermotropic liquid crystalline polymer spheres‐dispersed polycarbonate

Cited by 4 publications

References 33 publications

A gradient structure formed in injection‐molded polycarbonate in situ hybrid composites and its corresponding performances

A gradient structure formed in injection‐molded polycarbonate in situ hybrid composites and its corresponding performances

Compatibilization of nylon 6/liquid crystalline polymer blends with three types of compatibilizers

Phase Diagram for Predicting In Situ Fibrillation of LCP During Molding

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