scholarly journals Switchable gas permeability of a polypropylene‐liquid crystalline composite film

2021 ◽  
Author(s):  
Simon J. A. Houben ◽  
Joey Kloos ◽  
Zandrie Borneman ◽  
Albert P. H. J. Schenning
Keyword(s):  
Composite Film ◽  
Liquid Crystalline ◽  
Gas Permeability

scholarly journals A calamitic mesogenic near-infrared absorbing croconaine dye/liquid crystalline elastomer composite

2016 ◽  
Vol 7 (7) ◽  
pp. 4400-4406 ◽  
Author(s):  
Ling-Xiang Guo ◽  
Mei-Hua Liu ◽  
Sayed Mir Sayed ◽  
Bao-Ping Lin ◽  
Patrick Keller ◽  
...  
Keyword(s):  
Composite Film ◽  
Liquid Crystalline ◽  
Near Infrared ◽  
Organic Dye

The first example of a calamitic mesogenic NIR absorbing organic dye YHD796 is reported. The corresponding homogeneously-aligned LCE/YHD796 composite film can perform a fully reversible NIR-stimulated contraction/expansion response.

Development of Composite Film for Improving Gas Permeable Properties

2010 ◽  
Vol 93-94 ◽  
pp. 647-650
Author(s):  
Suntaree Siraratprapa ◽  
Chuanchom Aumnete ◽  
Waranya Phompan ◽  
Suebpong Kongniam ◽  
Jittiporn Kruenate
Keyword(s):  
Composite Film ◽  
Vinyl Acetate ◽  
Gas Permeability ◽  
Ethylene Vinyl Acetate ◽  
High Porosity ◽  
Ph Indicator ◽  
Accurate Detection ◽  
Internal Mixer

Generally, a suitable polymer for using as pH indicator packaging should exhibit high porosity to provide a maximum gas permeability which lead to an accurate detection. Ethylene vinyl acetate (EVA) is normally used as such application. However, the gas permeability of EVA was fairly low as 1685.0940 cc/ (m2-day) which not good enough for used as pH indicator packaging application is. To increase a permeability of gas, high porous diatom incorporating with biopolymer was mixed into EVA polymer via internal mixer. It was found that the gas permeability of EVA filled porous diatom/biopolymer was increased up to 4204.2225 cc/ (m2-day). This property is one of the crucial properties for further design for pH indicator packaging in NHAM product.

Liquid crystalline copolyester/polyethylenein situ composite film: Rheology, morphology, molecular orientation, and tensile properties

2002 ◽  
Vol 84 (3) ◽  
pp. 561-567 ◽  
Author(s):  
Teeranant Nakinpong ◽  
Sauvarop Bualek-Limcharoen ◽  
Angkana Bhutton ◽  
Ornsiri Aungsupravate ◽  
Taweechai Amornsakchai
Keyword(s):  
Composite Film ◽  
Tensile Properties ◽  
Molecular Orientation ◽  
Liquid Crystalline ◽  
Liquid Crystalline Copolyester

Reusable gold nanorod/liquid crystalline elastomer (GNR/LCE) composite films with UV-triggered dynamic crosslinks capable of micropatterning and NIR actuation

2019 ◽  
Vol 7 (45) ◽  
pp. 14245-14254 ◽  
Author(s):  
Zhongying Wu ◽  
Liang Liu ◽  
Pin Cheng ◽  
Jianglin Fang ◽  
Tianchi Xu ◽  
...  
Keyword(s):  
Composite Film ◽  
Liquid Crystalline ◽  
Near Infrared ◽  
Composite Films ◽  
Gold Nanorod

A facilely prepared GNR/LCE composite film with UV-triggered reversible dynamic crosslinking capable of near infrared (NIR)-driven macroscopic deformations, precise micro-patterned localization and re-shapeability.

Freeze fracture imaging and computer simulation of liposome structure: Membrane geometry and defects

1983 ◽  
Vol 41 ◽  
pp. 646-647
Author(s):  
Joseph A. Zasadzinski
Keyword(s):  
Liquid Crystalline ◽  
Freeze Fracture ◽  
Continuum Theory ◽  
Closed Surfaces ◽  
Straight Line ◽  
Low Weight ◽  
Concentric Spheres ◽  
Membrane Geometry ◽  
Dupin Cyclides ◽  
Limiting Case

At low weight fractions, many surfactant and biological amphiphiles form dispersions of lamellar liquid crystalline liposomes in water. Amphiphile molecules tend to align themselves in parallel bilayers which are free to bend. Bilayers must form closed surfaces to separate hydrophobic and hydrophilic domains completely. Continuum theory of liquid crystals requires that the constant spacing of bilayer surfaces be maintained except at singularities of no more than line extent. Maxwell demonstrated that only two types of closed surfaces can satisfy this constraint: concentric spheres and Dupin cyclides. Dupin cyclides (Figure 1) are parallel closed surfaces which have a conjugate ellipse (r1) and hyperbola (r2) as singularities in the bilayer spacing. Any straight line drawn from a point on the ellipse to a point on the hyperbola is normal to every surface it intersects (broken lines in Figure 1). A simple example, and limiting case, is a family of concentric tori (Figure 1b).To distinguish between the allowable arrangements, freeze fracture TEM micrographs of representative biological (L-α phosphotidylcholine: L-α PC) and surfactant (sodium heptylnonyl benzenesulfonate: SHBS)liposomes are compared to mathematically derived sections of Dupin cyclides and concentric spheres.

Electron microscopy of crystalline structure in thermotropic random copolymers

1991 ◽  
Vol 49 ◽  
pp. 1054-1055
Author(s):  
Afzana Anwer ◽  
S. Eilidh Bedford ◽  
Richard J. Spontak ◽  
Alan H. Windle
Keyword(s):  
Electron Microscopy ◽  
Crystalline Structure ◽  
Liquid Crystalline ◽  
Elevated Temperatures ◽  
Random Copolymers ◽  
Molecular Characteristics ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Identical Monomer ◽  
Periodic Layer

Random copolyesters composed of wholly aromatic monomers such as p-oxybenzoate (B) and 2,6-oxynaphthoate (N) are known to exhibit liquid crystalline characteristics at elevated temperatures and over a broad composition range. Previous studies employing techniques such as X-ray diffractometry (XRD) and differential scanning calorimetry (DSC) have conclusively proven that these thermotropic copolymers can possess a significant crystalline fraction, depending on molecular characteristics and processing history, despite the fact that the copolymer chains possess random intramolecular sequencing. Consequently, the nature of the crystalline structure that develops when these materials are processed in their mesophases and subsequently annealed has recently received considerable attention. A model that has been consistent with all experimental observations involves the Non-Periodic Layer (NPL) crystallite, which occurs when identical monomer sequences enter into register between adjacent chains. The objective of this work is to employ electron microscopy to identify and characterize these crystallites.

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