Properties of blends of polycarbonate and a thermotropic liquid crystalline polymer

H. S. Lee; W. H. Jung; H. W. Jung; Woo Nyon Kim; J. C. Hyun

Properties of blends of polycarbonate and a thermotropic liquid crystalline polymer

H. S. Lee, W. H. Jung, H. W. Jung, Woo Nyon Kim, J. C. Hyun

Research output: Contribution to journal › Article › peer-review

Abstract

Thermal properties, morphology, and Theological properties of the blends of polycarbonate (PC) and a thermotropic liquid crystalline polymer (LCP) prepared by screw extrusion have been investigated by differential scanning calorimeter (DSC), scanning electron microscopy (SEM), polarized optical microscopy, and rotational rheometry. From the measured glass transition temperature (T_g), the LCP appears to dissolve more in the PC-rich phase than does the PC in the LCP-rich phase. The polymer-polymer interaction parameter (χ₁₂) and the degree of disorder (y/x₁) of LCP were investigated using lattice theory in which the anisotropy of LCP was considered. The polymer-polymer interaction parameter (#12) were determined and found to be 0.068 for the extruded blends of PC-LCP (5 : 5) at 523 K. Significant depression of the viscosity is observed in the PC-rich blends and this is mainly due to the fibrous structure of the LCP in the blends. The storage modulus of the PC-rich compositions exceeds that of the matrix component at low frequencies and this result may be due to the increase of elasticity of the blends.

Original language	English
Pages (from-to)	813-822
Number of pages	10
Journal	Polymer (Korea)
Volume	20
Issue number	5
Publication status	Published - 1996

Keywords

Blend
Liquid crystalline polymer
Morphology
Polycarbonate
Rheology

ASJC Scopus subject areas

General Chemical Engineering
Polymers and Plastics
Materials Chemistry

Cite this

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title = "Properties of blends of polycarbonate and a thermotropic liquid crystalline polymer",

abstract = "Thermal properties, morphology, and Theological properties of the blends of polycarbonate (PC) and a thermotropic liquid crystalline polymer (LCP) prepared by screw extrusion have been investigated by differential scanning calorimeter (DSC), scanning electron microscopy (SEM), polarized optical microscopy, and rotational rheometry. From the measured glass transition temperature (Tg), the LCP appears to dissolve more in the PC-rich phase than does the PC in the LCP-rich phase. The polymer-polymer interaction parameter (χ12) and the degree of disorder (y/x1) of LCP were investigated using lattice theory in which the anisotropy of LCP was considered. The polymer-polymer interaction parameter (#12) were determined and found to be 0.068 for the extruded blends of PC-LCP (5 : 5) at 523 K. Significant depression of the viscosity is observed in the PC-rich blends and this is mainly due to the fibrous structure of the LCP in the blends. The storage modulus of the PC-rich compositions exceeds that of the matrix component at low frequencies and this result may be due to the increase of elasticity of the blends.",

keywords = "Blend, Liquid crystalline polymer, Morphology, Polycarbonate, Rheology",

author = "Lee, {H. S.} and Jung, {W. H.} and Jung, {H. W.} and Kim, {Woo Nyon} and Hyun, {J. C.}",

year = "1996",

language = "English",

volume = "20",

pages = "813--822",

journal = "Polymer (Korea)",

issn = "0379-153X",

publisher = "Polymer Society of Korea",

number = "5",

}

TY - JOUR

T1 - Properties of blends of polycarbonate and a thermotropic liquid crystalline polymer

AU - Lee, H. S.

AU - Jung, W. H.

AU - Jung, H. W.

AU - Kim, Woo Nyon

AU - Hyun, J. C.

PY - 1996

Y1 - 1996

N2 - Thermal properties, morphology, and Theological properties of the blends of polycarbonate (PC) and a thermotropic liquid crystalline polymer (LCP) prepared by screw extrusion have been investigated by differential scanning calorimeter (DSC), scanning electron microscopy (SEM), polarized optical microscopy, and rotational rheometry. From the measured glass transition temperature (Tg), the LCP appears to dissolve more in the PC-rich phase than does the PC in the LCP-rich phase. The polymer-polymer interaction parameter (χ12) and the degree of disorder (y/x1) of LCP were investigated using lattice theory in which the anisotropy of LCP was considered. The polymer-polymer interaction parameter (#12) were determined and found to be 0.068 for the extruded blends of PC-LCP (5 : 5) at 523 K. Significant depression of the viscosity is observed in the PC-rich blends and this is mainly due to the fibrous structure of the LCP in the blends. The storage modulus of the PC-rich compositions exceeds that of the matrix component at low frequencies and this result may be due to the increase of elasticity of the blends.

AB - Thermal properties, morphology, and Theological properties of the blends of polycarbonate (PC) and a thermotropic liquid crystalline polymer (LCP) prepared by screw extrusion have been investigated by differential scanning calorimeter (DSC), scanning electron microscopy (SEM), polarized optical microscopy, and rotational rheometry. From the measured glass transition temperature (Tg), the LCP appears to dissolve more in the PC-rich phase than does the PC in the LCP-rich phase. The polymer-polymer interaction parameter (χ12) and the degree of disorder (y/x1) of LCP were investigated using lattice theory in which the anisotropy of LCP was considered. The polymer-polymer interaction parameter (#12) were determined and found to be 0.068 for the extruded blends of PC-LCP (5 : 5) at 523 K. Significant depression of the viscosity is observed in the PC-rich blends and this is mainly due to the fibrous structure of the LCP in the blends. The storage modulus of the PC-rich compositions exceeds that of the matrix component at low frequencies and this result may be due to the increase of elasticity of the blends.

KW - Blend

KW - Liquid crystalline polymer

KW - Morphology

KW - Polycarbonate

KW - Rheology

UR - http://www.scopus.com/inward/record.url?scp=21444443124&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:21444443124

SN - 0379-153X

VL - 20

SP - 813

EP - 822

JO - Polymer (Korea)

JF - Polymer (Korea)

IS - 5

ER -

Properties of blends of polycarbonate and a thermotropic liquid crystalline polymer

Abstract

Keywords

ASJC Scopus subject areas

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