Influences of melt-draw ratio and annealing on the crystalline structure and orientation of poly(4-methyl-1-pentene) casting films

RSC Advances ◽  
2016 ◽  
Vol 6 (67) ◽  
pp. 62038-62044 ◽  
Author(s):  
Ai-ping Ma ◽  
Li-yang Xu ◽  
Bo Yin ◽  
Ming-bo Yang ◽  
Bang-hu Xie
Keyword(s):  
Crystalline Structure ◽  
Lamellar Structure ◽  
Draw Ratio ◽  
Slit Die

Poly(4-methyl-1-pentene) casting films with a row-nucleated lamellar structure were extruded through a slit die followed by stretching using a chill roll.

Crystalline and Lamellar Structure of Polypropylene Fibrillated Fibres

2013 ◽  
Vol 203-204 ◽  
pp. 439-442
Author(s):  
Marcin Bączek ◽  
Czesław Ślusarczyk ◽  
Jan Broda
Keyword(s):  
Small Angle ◽  
Crystalline Phase ◽  
Lamellar Structure ◽  
Draw Ratio ◽  
Crystallinity Index ◽  
Orientation Factor ◽  
Processing Conditions ◽  
X Ray ◽  
X Ray Scattering ◽  
The Impact

The effects of processing conditions on the structure of polypropylene fibrillated fibres were studied using a combination of wide- and small-angle X-ray scattering methods. In particular the impact of selected stages of processing on the crystalline and lamellar structure of PP were analyzed. It was stated that crystalline phase is built from α crystals. The crystallinity index as well as the Herman orientation factor of the crystalline phase is found to have a correlation only with the draw ratio of the PP film. The lamellar structure also changes with the draw ratio.

Study on the Structure and Property of Ultra-Fine Denier PET Full Drawing Yarn: Effect of Draw Ratio and Take-Up Velocity

2011 ◽  
Vol 217-218 ◽  
pp. 377-382
Author(s):  
Feng Lei Shen ◽  
Guo Qiang Chen ◽  
Jiang Zhong Ding ◽  
Ju Yan Dai ◽  
Xiu Feng Yu
Keyword(s):  
Mechanical Properties ◽  
Crystalline Structure ◽  
Draw Ratio ◽  
Linear Density ◽  
Molecular Chain ◽  
Boiling Water ◽  
Crystalline Size ◽  
Sonic Velocity ◽  
Structure And Property ◽  
Xrd Method

The effect of draw ratio and take-up velocity on the structure and property of the ultra-fine denier PET full drawing yarn (PET-FDY) with monofilament linear density equal to 0.38dTex was studied in this paper. The crystalline structure and crystalline size were determined by XRD method and size was reduced with increase of draw ratio. The orientation of whole molecular chain was determined using sonic velocity method. The mechanical properties and boiling water shrinkage were also examined. Draw ratio had greater influence on the boiling water shrinkage than take-up velocity did.

Influence of Draw Ratio on Crystal Morphology and Structure of β-Form of Isotactic Polypropylene

2011 ◽  
Vol 221 ◽  
pp. 54-59
Author(s):  
Bin Zhang ◽  
Jing Bo Chen ◽  
Bi Wei Qiu ◽  
Fang Fang Ji ◽  
Chang Yu Shen
Keyword(s):  
Draw Ratio ◽  
Crystal Morphology ◽  
Polarized Light ◽  
Content Increase ◽  
Wide Angle ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Scattering ◽  
Slit Die ◽  
Polymorphic Nature

The effects of the draw ratio (DR) on the polymorphic nature of β-iPP were investigated by polarized light microscopy (PLM), wide angle X-ray diffraction (WAXD), small angle X-ray scattering (SAXS) and differential scanning calorimeter (DSC). The iPP sheet is extruded through a slit die, and then the extruded sheets were hot stretched with the different draw ratio (DR). DSC and WAXD results indicate that the β-iPP content increase with DR increasing from 4.8 to 10.8. β-spherulites can be observed by PLM in the stretched specimen even at a lower DR (4.8). With increasing draw ratio, the relative amount of the β-cylindrites crystals gradually increased.

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.

The extracellular matrix of echinoderm and amphibian eggs: Visualization in quick-frozen, deep-etched, and rotary-shadowed specimens

1990 ◽  
Vol 48 (3) ◽  
pp. 60-61
Author(s):  
Barry Bonnell ◽  
Carolyn Larabell ◽  
Douglas Chandler
Keyword(s):  
Extracellular Matrix ◽  
Plasma Membrane ◽  
Sea Urchin ◽  
Crystalline Structure ◽  
Cortical Granule ◽  
Two Dimensional ◽  
Small Peptides ◽  
Deep Etching ◽  
Quick Freezing ◽  
Acrosomal Reaction

Eggs of many species including those of echinoderms, amphibians and mammals exhibit an extensive extracellular matrix (ECM) that is important both in the reception of sperm and in providing a block to polyspermy after fertilization.In sea urchin eggs there are two distinctive coats, the vitelline layer which contains glycoprotein sperm receptors and the jelly layer that contains fucose sulfate glycoconjugates which trigger the acrosomal reaction and small peptides which act as chemoattractants for sperm. The vitelline layer (VL), as visualized by quick-freezing, deep-etching, and rotary-shadowing (QFDE-RS), is a fishnet-like structure, anchored to the plasma membrane by short posts. Orbiting above the VL are horizontal filaments which are thought to anchor the thicker jelly layer to the egg. Upon fertilization, the VL elevates and is transformed by cortical granule secretions into the fertilization envelope (FE). The rounded casts of microvilli in the VL are transformed into angular peaks and the envelope becomes coated inside and out with sheets of paracrystalline protein having a quasi-two dimensional crystalline structure.

EFFECTS OF UNTWINNING AND {1012} TWIN LAMELLAR STRUCTURE ON THE MECHANICAL PROPERTIES OF Mg ALLOY

2013 ◽  
Vol 49 (3) ◽  
pp. 291 ◽  
Author(s):  
Chao LOU ◽  
Xiyan ZHANG ◽  
Runhong WANG ◽  
Gaolin DUAN ◽  
Qing LIU
Keyword(s):  
Mechanical Properties ◽  
Lamellar Structure ◽  
Mg Alloy

Influence of AlPO4 Crystalline Structure on Microstructure and Antioxidation Property of Multi-layer Coating

2010 ◽  
Vol 25 (5) ◽  
pp. 527-531
Author(s):  
Wen-Dong YANG ◽  
Jian-Feng HUANG ◽  
Li-Yun CAO ◽  
Chang-Kui XIA
Keyword(s):  
Crystalline Structure ◽  
Layer Coating

The Crystalline Structure, Optical and Conductivity Properties of Fluorine Doped ZnO Nanoparticles

2019 ◽  
Vol 11 (3) ◽  
pp. 03002-1-03002-5 ◽  
Author(s):  
A. Diha ◽  
◽  
S. Benramache ◽  
L. Fellah ◽  
◽  
...  
Keyword(s):  
Crystalline Structure ◽  
Zno Nanoparticles ◽  
Doped Zno
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