Advertisement

Topics

Polymorphic Crystal Transition and Lamellae Structural Evolution of Poly(p-dioxanone) Induced by Annealing and Stretching.

08:00 EDT 11th April 2019 | BioPortfolio

Summary of "Polymorphic Crystal Transition and Lamellae Structural Evolution of Poly(p-dioxanone) Induced by Annealing and Stretching."

Semicrystalline polymers usually undergo multilevel microstructural evolutions under high-temperature annealing and stretching deformation; this is essential to tailor the physical properties of polymer products in industrial processing. Here, we choose poly(p-dioxanone) (PPDO), a typical biodegradable, biocompatible, and bioresorbable polymer, as a model semicrystalline polymer and investigated its polymorphic structural transition and crystalline lamellar evolution under high-temperature annealing and stretching. High-temperature annealing caused the α'-to-α crystal transition of PPDO, accompanied by the improvement of crystallinity (Xc) and thickening of crystalline lamellae. Tensile strength and Young's modulus of PPDO increased but the breaking strain decreased as the annealing temperature increased. Stretch-induced phase transition of PPDO depended strongly on the initial structure and stretching temperature (Ts). The α-form PPDO transformed into its α' counterpart during stretching at low Ts; this phase transition was irreversible and did not retain to α form with the release of stress. However, no phase transition took place for the α-form PPDO stretched at high Ts ( ≥ 40 °C). Original lamellae of α-form PPDO changed into the fibrillar lamellae during stretching via melt-recrystallization mechanism.

Affiliation

Journal Details

This article was published in the following journal.

Name: The journal of physical chemistry. B
ISSN: 1520-5207
Pages:

Links

DeepDyve research library

PubMed Articles [13403 Associated PubMed Articles listed on BioPortfolio]

Atomistic modelling of entropy driven phase transitions between different crystal modifications in polymers: the case of poly(3-alkylthiophenes).

Polymorphism and related solid-state phase transitions affect the structure and morphology and hence the properties of materials, but they are not-so-well understood. Atomistic computational methods c...

Ferromagnetic van der Waals crystal VI.

We report structural, physical properties and electronic structure of van der Waals (vdW) crystal VI. Detailed analysis reveals that VI exhibits a structural transition from monoclinic C2/ m to rhombo...

Pressure-induced phase transitions and structural evolution across the insulator-metal transition in bulk and nanoscale BiFeO3.

The pressure-induced phase-transition sequences and structural evolution across the insulator-metal transition (IMT) in multiferroic BiFeO<sub>3</sub> still remain unclear. Here we use a c...

Hydrogen-Bonded Polyrotaxane Cation Structure in Nickel Dithiolate Anion Radical Salts, Ferromagnetic and Semiconducting Behavior Associated with Structural Phase Transition.

The pseudo-polyrotaxane structure of [(H-bpy+)(DB[24]crown-8)]∞ (H-bpy+ = monoprotonated 4,4-bipyridinium; DB[24]crown-8 = dibenzo[24]crown-8) was incorporated into anion radical salts, [Ni(dmit)2]-...

The evolution of cooperation in signed networks under the impact of structural balance.

Structural balance plays an important role in the dynamics of signed networks. Based on structural balance, we generalize the evolution of cooperation in signed networks. Here we develop a new simulat...

Clinical Trials [1988 Associated Clinical Trials listed on BioPortfolio]

Safety Study of FluMist With and Without Ampligen

The purpose of this study is to evaluate FluMist with and without Ampligen in healthy volunteers.

Co-crystal E-58425 vs Tramadol and Celecoxib for Moderate to Severe Acute Pain After Bunionectomy. Phase III Clinical Trial.

This is a Phase 3, randomized, double-blind, controlled, parallel-group, multicenter clinical trial with co-crystal E-58425 compared to tramadol, to celecoxib, and to placebo. The primary ...

Phase I Oncovir Poly IC:LC and NY-ESO-1/gp100/MART

The purpose of this study is to determine what side effects CP 870,893 may cause when given with an immune stimulant called Oncovir poly IC:LC along with a melanoma vaccine. The CP 870,893...

Neoadjuvant Hiltonol® (PolyICLC) for Prostate Cancer

The purpose of this study is to test an approach of stimulating the body's immune system to attack prostate cancer. This study will test injection of a substance polylysine and carboxymeth...

Flecainide for Catecholaminergic Polymorphic Ventricular Tachycardia

The purpose of this study is to test whether the addition of oral flecainide to standard therapy will reduce cardiac events compared to placebo plus standard therapy in patients with Catec...

Medical and Biotech [MESH] Definitions

The techniques used to produce molecules exhibiting properties that conform to the demands of the experimenter. These techniques combine methods of generating structural changes with methods of selection. They are also used to examine proposed mechanisms of evolution under in vitro selection conditions.

A poly(A) binding protein that is involved in promoting the extension of the poly A tails of MRNA. The protein requires a minimum of ten ADENOSINE nucleotides in order for binding to mRNA. Once bound it works in conjunction with CLEAVAGE AND POLYADENYLATION SPECIFICITY FACTOR to stimulate the rate of poly A synthesis by POLY A POLYMERASE. Once poly-A tails reach around 250 nucleotides in length poly(A) binding protein II no longer stimulates POLYADENYLATION. Mutations within a GCG repeat region in the gene for poly(A) binding protein II have been shown to cause the disease MUSCULAR DYSTROPHY, OCULOPHARYNGEAL.

A circular structural unit of bone tissue. It consists of a central hole, the Haversian canal through which blood vessels run, surrounded by concentric rings, called lamellae.

The interdisciplinary science that studies evolutionary biology, including the origin and evolution of the major elements required for life, their processing in the interstellar medium and in protostellar systems. This field also includes the study of chemical evolution and the subsequent interactions between evolving biota and planetary evolution as well as the field of biology that deals with the study of extraterrestrial life.

Evolution at the molecular level of DNA sequences and proteins. (Rieger et al., Glossary of Genetics: Classical and Molecular, 5th ed)

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Relevant Topic

Mental Health
Adhd Anorexia Depression Dyslexia Mental Health Psychiatry Schizophrenia Stress Mental health, although not being as obvious as physical health, is very important, causing great unhappiness to those affected, causing add...


Searches Linking to this Article