Characterization of thermotropic liquid crystalline polyester/polycarbonate blends: Miscibility, rheology, and free volume behavior

Hsieh, Tsung-Tang; Tiu, Carlos; Hsieh, K. H.; Simon, George P.

doi:10.1002/1097-4628(20000906)77:10<2319::aid-app26>3.0.co;2-#

Cited by 29 publications

(21 citation statements)

References 40 publications

(56 reference statements)

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“…1). These results are similar to those reported in the literature 16, 25, 26. Sauer et al25 for example, used the temperature modulated differential scanning calorimetry (TMDSC) technique and reported that the onset and end of LCP T g were at 74 and 98°C, respectively, and the midpoint was at 86°C.…”

Section: Resultssupporting

confidence: 87%

Determination of the phase diagram of HBA‐HNA liquid crystalline polymer/polycarbonate blends

Lee

Chan

Kamal

2008

J of Applied Polymer Sci

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The phase diagram of blends of liquid crystalline polymer (LCP) and polycarbonate (PC) was constructed. The effect of temperature on morphological development in melt-blended samples was examined with a polarized light microscope, in conjunction with a heating stage. Phase separation in the blend was observed as the temperature was increased. For a particular LCP/PC blend composition, two-phase separation temperatures (T sp1 and T sp2 ) were determined. Consequently, the corresponding phase diagram relating to phase separation was constructed. It was divided into three regions. No phase separation occurred when the blend was below T sp1 . However, a slight phase separation was detected when the temperature was between T sp1 and T sp2 . Moreover, pronounced phase separation was observed when the blend was at a temperature above T sp2 . The phase-separated structure varied according to the initial composition of the blends.

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Section: Resultssupporting

confidence: 87%

Determination of the phase diagram of HBA‐HNA liquid crystalline polymer/polycarbonate blends

Lee

Chan

Kamal

2008

J of Applied Polymer Sci

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“…A number of researchers [11][12][13][14][15][16][17][18][19][20][21][25][26][27][30][31][32] have correlated compatibility in blend membranes with their microstructural properties that are measured with the use of a technique of positron annihilation lifetime spectroscopy (PALS). These properties include ortho-positronium (o-Ps) lifetime ( 3 ) and intensity (I 3 ), which are related to the radius of free volume (R) in polymeric membranes.…”

Section: Positron Annihilation Lifetime Spectroscopic Data For Blend mentioning

confidence: 99%

“…Limited investigations have extended their discussion to include the use of free volume information in examining the compatibility in PC blend membranes [27,[30][31][32], and the pervaporation performance of these blend membranes is yet to be reported. Hence, the present study was conducted to analyze on a molecular level the compatibilizing action of a PC-g-PHEMA graft copolymer in a solution blend membrane of PC and a hydrophilic PHEMA, with the purpose of exploring the compatibilizer effect on the compatibility in terms of correlating the compatibilized blend membrane morphology, thermal stability, and pervaporation performance with the free volume characteristics.…”

Section: Introductionmentioning

confidence: 99%

Effect of compatibilizer on compatibility and pervaporation performance of PC/PHEMA blend membranes

Guzman

Liu

Chen

et al. 2011

Journal of Membrane Science

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“…The plots of G′ and G″ as a function of ω is shown in Figure 2. The values of G′ and G″ at low frequency generally provide information about long-range (beyond entanglement distance) relaxation, while the values at high frequency provide information about short range (motion with entanglement) relaxation (38) . As seen from Figure 2(a), G′ increases with increasing ω indicating a dependence of G′ on the time scale of molecular motion.…”

Section: Rheological Behavior In the Molten Statementioning

confidence: 99%

In Situ Reinforcing Elastomer Composite Based on Polyolefinic Thermoplastic Elastomer and Thermotropic Liquid Crystalline Polymer

Saikrasun

Phoban

Limpisawasdi

et al. 2007

JMMP

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In situ reinforcing elastomer composites based on Santoprene thermoplastic elastomer, a polymerized polyolefin compound of ethylene-propylene-diene monomer (EPDM)/polypropylene (PP), and a thermotropic liquid crystalline polymer (TLCP), Rodrun LC3000, were prepared using a single-screw extruder. The rheological behavior, morphology, mechanical and thermal properties of the blends containing various LC3000 contents were investigated.All neat components and their blends exhibited shear thinning behavior. With increasing TLCP content, processability became easier because of the decrease in melt viscosity of the blends. Despite the viscosity ratio of dispersed phase to the matrix phase for the blend system is lower than 0.14, most of TLCP domains in the blends containing 5-10 wt% LC3000 appeared as droplets. At 20 wt% LC3000 or more, the domain size of TLCP became larger due to the coalescence of liquid TLCP threads that occurred during extrusion. The addition of LC3000 into the elastomer matrix enhanced the initial tensile modulus considerably whereas the extensibility of the blends remarkably decreased with addition of high TLCP level (>20wt%). The results obtained from thermogravimetric analysis suggested that the incorporation of LC3000 into Santoprene slightly improved the thermal resistance both in nitrogen and in air.

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Characterization of thermotropic liquid crystalline polyester/polycarbonate blends: Miscibility, rheology, and free volume behavior

Cited by 29 publications

References 40 publications

Determination of the phase diagram of HBA‐HNA liquid crystalline polymer/polycarbonate blends

Determination of the phase diagram of HBA‐HNA liquid crystalline polymer/polycarbonate blends

Effect of compatibilizer on compatibility and pervaporation performance of PC/PHEMA blend membranes

In Situ Reinforcing Elastomer Composite Based on Polyolefinic Thermoplastic Elastomer and Thermotropic Liquid Crystalline Polymer

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