Transesterification, morphology and some mechanical properties of thermotropic liquid crystal polymers/polycarbonate blends

Tovar, Gabriela; Carreau, Pierre J.; Schreiber, H. P.

doi:10.1016/s0927-7757(99)00339-8

Cited by 22 publications

(19 citation statements)

References 22 publications

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“…This indicates that the immediate substituents of this carbonyl group did not have significant changes. This result is different from the findings of Tovar et al,19 in which they observed a major peak shift from 1780 to 1763 cm −1 for blends containing up to 20 wt % LCP prepared at 320°C. On the other hand, a slight peak shift was observed for the carbonyl group of the LCP portion in the blends.…”

Section: Resultscontrasting

confidence: 99%

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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: Resultscontrasting

confidence: 99%

“…Tovar et al19 studied TE between HBA‐HNA type LCP (Vectra A950) and PC that were prepared in the temperature range of 280–320°C. They showed that the extent of TE depended on the processing temperature and the amount of moisture in the parent materials.…”

Section: Introductionmentioning

confidence: 99%

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 objective of this research is to examine the temperature dependence of polymer interactions in greater detail than previously. Other studies of the subject1–4 have suggested that notably specific, or acid–base, interactions tend to abate at elevated temperatures. This raises the possibility that enhanced compatibility can be attained in polymer systems in which a mismatch of acid–base functionality results in incompatibility.…”

Section: Introductionmentioning

confidence: 99%

“…In this context, the question of temperature dependence becomes important. The temperature dependence of L/W forces, if not firmly established on theoretical grounds, has been documented experimentally 1–4. Polymer surface energies are known to vary inversely with the temperature.…”

Section: Introductionmentioning

confidence: 99%

“…Little attention appears to have been devoted to the question of the temperature dependence for acid–base interactions. However, in recent work,1–4 we have used the method of inverse gas chromatography to show that acid–base forces also diminish with rising temperature. Materials such as polystyrene (PS), polycarbonate, and poly(methyl methacrylate) (PMMA) attain a zero value at temperatures not too far above those associated with conventional processing.…”

Section: Introductionmentioning

confidence: 99%

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Physician characteristics associated with clinical trial enrollment

Barton¹

2011

CA: A Cancer Journal for Clinicians

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Plasmonic‐Enhanced Polymer‐Stabilized Liquid Crystals Switching for Integrated Optical Attenuation

Jian,

Liu,

et al. 2024

Advanced Optical Materials

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Liquid crystals are widely used in photonics because of their profound electro–optic properties. However, the slow switching speeds (milliseconds) and the fluid nature of liquid crystals restrict their potential use in integrated photonics. In this work, polymer‐stabilized liquid crystals are utilized as the functional material to improve the response time with a polymer network that helps pre‐orientate the liquid crystal. Additionally, plasmonic slot structures are simultaneously employed to minimize the switch voltage by confining the optical field within the electrode spacing at subwavelength scales. Thanks to the large overlap of the optical and electric fields, the scattering states of the polymer‐stabilized liquid crystal can be effectively manipulated to modulate the loss of the propagating wave, resulting in strong optical attenuation in the integrated photonic platform. Specifically, a plasmonic enhanced polymer‐stabilized liquid crystal photonic device for operation at 1550 nm, which has a length of only 10 µm and shows an extinction ratio of 0.38 dB µm−1, with a power consumption of less than 6 µW and a response time ≈20 µs, resulting in a figure‐of‐merit of 0.012 mW.

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Transesterification, morphology and some mechanical properties of thermotropic liquid crystal polymers/polycarbonate blends

Cited by 22 publications

References 22 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

Physician characteristics associated with clinical trial enrollment

Plasmonic‐Enhanced Polymer‐Stabilized Liquid Crystals Switching for Integrated Optical Attenuation

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