Improved cationic dyeability of thermotropic liquid crystal polyarylate fabrics by ultraviolet irradiation-induced grafting of acrylic acid

As one of the most promising high-performance fibers, it is worthwhile to investigate the dyeing property of thermotropic liquid crystal polyarylate (TLCP) fibers. In this work, ultraviolet (UV) irradiation-induced grafting using the acrylic acid (AAc) method was employed to improve the cationic dyeability of the TLCP fabrics. The TLCP fabrics were firstly immersed in an AAc monomer solution for 24 h, followed with the UV radiation process for grafting polymerization. The results showed that the dyeing performance to C.I. Basic Red 46 of the modified TLCP fabrics was remarkably improved. Through several characterizations, it was found that the AAc-grafted TLCP fibers became more roughened with many pits on the fiber surface, while the crystalline structure of the TLCP fibers was hardly affected. More importantly, carboxyl groups have been successfully introduced onto the TLCP fiber surface, which is the main reason for the good dye uptake. Therefore, this paper provides a simple and efficient way for the improvement of the cationic dyeing property of TLCP fabrics.

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Synthesis and properties of high performance aromatic thermotropic liquid crystal copolyesters based on naphthalene ring structure

Polymer ◽

10.1016/j.polymer.2021.124472 ◽

2021 ◽

pp. 124472

Author(s):

Peng Wei ◽

Hejuan Lou ◽

Jinfei Yan ◽

Longlong Li ◽

Yifeng Zhang ◽

...

Keyword(s):

Liquid Crystal ◽

High Performance ◽

Ring Structure ◽

Naphthalene Ring ◽

Thermotropic Liquid Crystal

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Reversible microscale assembly of nanoparticles driven by the phase transition of a thermotropic liquid crystal

10.26434/chemrxiv.5691169 ◽

2017 ◽

Author(s):

Niamh Mac Fhionnlaoich ◽

Stephen Schrettl ◽

Nicholas B. Tito ◽

Ye Yang ◽

Malavika Nair ◽

...

Keyword(s):

Phase Transition ◽

Liquid Crystal ◽

Self Assembly ◽

Nematic Phase ◽

Hierarchical Control ◽

Building Blocks ◽

Model System ◽

Microscopic Level ◽

Reversible Process ◽

Thermotropic Liquid Crystal

The arrangement of nanoscale building blocks into patterns with microscale periodicity is challenging to achieve via self-assembly processes. Here, we report on the phase transition-driven collective assembly of gold nanoparticles in a thermotropic liquid crystal. A temperature-induced transition from the isotropic to the nematic phase leads to the assembly of individual nanometre-sized particles into arrays of micrometre-sized aggregates, whose size and characteristic spacing can be tuned by varying the cooling rate. This fully reversible process offers hierarchical control over structural order on the molecular, nanoscopic, and microscopic level and is an interesting model system for the programmable patterning of nanocomposites with access to micrometre-sized periodicities.

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High Performance Liquid Crystal on Silicon Spatial Light Modulator (LCOS-SLM) and Flicker Noise Reduction of Multiple Spots

Proceedings of the International Display Workshops ◽

10.36463/idw.2019.lct6-5l ◽

2019 ◽

pp. 282

Author(s):

Hiroshi Tanaka ◽

Hiroto Sakai ◽

Munenori Takumi ◽

Haruyoshi Toyoda

Keyword(s):

Liquid Crystal ◽

Noise Reduction ◽

High Performance ◽

Spatial Light Modulator ◽

Flicker Noise ◽

Light Modulator ◽

Liquid Crystal On Silicon

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Propellant Containment Via Thermotropic Liquid Crystal Polymers

10.21236/ada341792 ◽

1998 ◽

Author(s):

J. J. Rusek ◽

M. Macler

Keyword(s):

Liquid Crystal ◽

Liquid Crystal Polymers ◽

Thermotropic Liquid Crystal

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Study of Transcrystallization in Polymer Composites

MRS Proceedings ◽

10.1557/proc-170-117 ◽

1989 ◽

Vol 170 ◽

Cited By ~ 15

Author(s):

Benjamin S. Hsiao ◽

J. H. Eric

Keyword(s):

Thermal Conductivity ◽

Free Energy ◽

Carbon Fiber ◽

Plasma Treatment ◽

Polymer Composites ◽

High Performance ◽

Interfacial Strength ◽

Fiber Surface ◽

Semicrystalline Polymers ◽

First Case

AbstractTranscrystallization of semicrystalline polymers, such as PEEK, PEKK and PPS, in high performance composites has been investigated. It is found that PPDT aramid fiber and pitch-based carbon fiber induce a transcrystalline interphase in all three polymers, whereas in PAN-based carbon fiber and glass fiber systems, transcrystallization occurs only under specific circumstances. Epitaxy is used to explain the surface-induced transcrystalline interphase in the first case. In the latter case, transcrystallization is probably not due to epitaxy, but may be attributed to the thermal conductivity mismatch. Plasma treatment on the fiber surface showed a negligible effect on inducing transcrystallization, implying that surface-free energy was not important. A microdebonding test was adopted to evaluate the interfacial strength between the fiber and matrix. Our preliminary results did not reveal any effect on the fiber/matrix interfacial strength of transcrystallinity.

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