Mechanical property investigation of single polymer particles with the variation of molecular structure of crosslinking monomer

2007 ◽  
Vol 105 (2) ◽  
pp. 783-789 ◽  
Author(s):  
Dong Ok Kim ◽  
Jeong Hee Jin
Keyword(s):  
Molecular Structure ◽  
Mechanical Property ◽  
Polymer Particles

scholarly journals Correlation Microanalysis of Localized Molecular Structure and Nano-mechanical Property of PVDF Based Copolymer

2019 ◽  
Vol 25 (S2) ◽  
pp. 2090-2091
Author(s):  
Wen Qian ◽  
Shuo Sun ◽  
Charles Nguyen ◽  
Stephen Ducharme ◽  
Joseph A. Turner
Keyword(s):  
Molecular Structure ◽  
Mechanical Property

Observation for mechanical property variations of single polymer particles

2007 ◽  
Vol 105 (2) ◽  
pp. 585-592 ◽  
Author(s):  
Dong Ok Kim ◽  
Jeong Hee Jin ◽  
Won Il Shon ◽  
Seok Heon Oh
Keyword(s):  
Mechanical Property ◽  
Polymer Particles

The Preparation and Characterization of Polycaprolactone Elastomer Polymer

2013 ◽  
Vol 641-642 ◽  
pp. 201-205
Author(s):  
Hong Su ◽  
Li Mei Guo ◽  
Lian Yong Wang
Keyword(s):  
Molecular Structure ◽  
Mechanical Property ◽  
Molecular Weight ◽  
Differential Scanning Calorimetry ◽  
Citric Acid ◽  
Gel Permeation Chromatography ◽  
Scanning Calorimetry ◽  
Elastomeric Material ◽  
Gel Permeation

polycaprolactone diols (MW=540, 1000, 2000) and citric acid were used as monomers, polycaprolactone-citric acid preformed polymer was preparated firstly by the heating polycondensation, then the preformed polymer was heated and cross-linked to obtain biodegradable elastomeric material. The molecular structure and Molecular weight was proved respectively by 1-HNMR and Gel Permeation Chromatography (GPC). The shape and glass transition temperature (Tg) of polycaprolactone-citric acid polymer was certified by differential scanning calorimetry(DSC). The hydrophilicity of the polymer was evaluated by its contact angle. The polymer’s mechanical property and degradation speed was also investigated.

Intrinsically heat-sealable polyimide films with atomic oxygen resistance: Synthesis and characterization

2020 ◽  
Vol 32 (8) ◽  
pp. 902-913 ◽  
Author(s):  
Hongjiang Ni ◽  
Yu Xing ◽  
Xiaoxiang Dai ◽  
Daijun Zhang ◽  
Jun Li ◽  
...  
Keyword(s):  
Molecular Structure ◽  
Mechanical Property ◽  
Thermal Resistance ◽  
Mechanical Strength ◽  
Phosphine Oxide ◽  
Atomic Oxygen ◽  
Synthesis And Characterization ◽  
Polyimide Films ◽  
Diphenylphosphine Oxide ◽  
Oxide Group

Intrinsically heat-sealable polyimides with atomic oxygen (AO) resistance (ARPIs) were synthesized from 2,3,3′,4′-oxydiphthalic anhydride (aODPA), 2,5-bis[(4-aminophenoxy)phenyl]diphenylphosphine oxide (BADPO), and para-phenylenediamine (PDA). The effects of the molecular structure and diamine ratio were investigated on the properties of the ARPI, including mechanical property, thermal property, heat sealability, and AO resistance. Heat sealability and AO resistance were realized for the ARPI film by combining the asymmetry of the aODPA moiety and the passivated layer forming characteristic of diphenylphosphine phosphine oxide group. Meanwhile, the deficiency of low mechanical strength and thermal resistance, commonly existing in a completely BADPO-derived polyimide system, was remedied effectively by the higher reactivity and rigidity of PDA.

Analysis of the dynamic mechanical property of multiple direction impact protection structure inspired by C60 molecule

2019 ◽  
Vol 233 (17) ◽  
pp. 5919-5932
Author(s):  
Xinhui Shen ◽  
Jinguo Liu ◽  
Pengwei Zhang ◽  
Zhiyu Ni ◽  
Yuwang Liu
Keyword(s):  
Molecular Structure ◽  
Mechanical Properties ◽  
Mechanical Property ◽  
Dynamic Mechanical Properties ◽  
Diameter Ratio ◽  
Dynamic Mechanical Property ◽  
Dynamic Mechanical ◽  
Good Ability ◽  
Impact Protection ◽  
Hollow Ball

The natural structures have excellent dynamic mechanical properties. In this work, an impact protection structure inspired by the C60 molecule was proposed. And a model of a hollow ball protected by the bio-inspired C60 molecular structure during a drop testing was built. For the bio-inspired C60 molecular structure, the drop process and the dynamic mechanical property was investigated by LS-DYNA software. The results indicate that the bio-inspired C60 molecular structure has a good ability to protect against impact. Furthermore, the effects of the diameter ratio, materials, drop height, and angle were discussed. These variations of geometry and material can influence the dynamic mechanical properties of the bio-inspired C60 molecular impact protection structure.

Molecular Structure of the Outermost Cell Wall Component of Spirillum Serpens

1977 ◽  
Vol 35 ◽  
pp. 342-343
Author(s):  
Wah Chiu ◽  
David Grano
Keyword(s):  
Molecular Structure ◽  
Cell Wall ◽  
Outer Membrane ◽  
Gel Electrophoresis ◽  
Electron Microscopic Examination ◽  
Electron Microscopic ◽  
Cell Wall Component ◽  
Protein Components ◽  
Exposure Technique ◽  
Structural Aspects

The periodic structure external to the outer membrane of Spirillum serpens VHA has been isolated by similar procedures to those used by Buckmire and Murray (1). From SDS gel electrophoresis, we have found that the isolated fragments contain several protein components, and that the crystalline structure is composed of a glycoprotein component with a molecular weight of ∽ 140,000 daltons (2). Under an electron microscopic examination, we have visualized the hexagonally-packed glycoprotein subunits, as well as the bilayer profile of the outer membrane. In this paper, we will discuss some structural aspects of the crystalline glycoproteins, based on computer-reconstructed images of the external cell wall fragments.The specimens were prepared for electron microscopy in two ways: negatively stained with 1% PTA, and maintained in a frozen-hydrated state (3). The micrographs were taken with a JEM-100B electron microscope with a field emission gun. The minimum exposure technique was essential for imaging the frozen- hydrated specimens.

Thermomechanical Treatment of a 4340 Ni-Cr-Mo Alloy Steel

1981 ◽  
Vol 39 ◽  
pp. 314-315 ◽  
Author(s):  
M.T. Jahn ◽  
J.C. Yang ◽  
C.M. Wan
Keyword(s):  
Mechanical Property ◽  
Chemical Composition ◽  
Alloy Steel ◽  
Thermomechanical Treatment ◽  
Room Temperature ◽  
Good Combination ◽  
Thermal Treatments ◽  
Low Carbon ◽  
4340 Steel ◽  
Good Improvement

4340 Ni-Cr-Mo alloy steel is widely used due to its good combination of strength and toughness. The mechanical property of 4340 steel can be improved by various thermal treatments. The influence of thermomechanical treatment (TMT) has been studied in a low carbon Ni-Cr-Mo steel having chemical composition closed to 4340 steel. TMT of 4340 steel is rarely examined up to now. In this study we obtain good improvement on the mechanical property of 4340 steel by TMT. The mechanism is explained in terms of TEM microstructures4340 (0.39C-1.81Ni-0.93Cr-0.26Mo) steel was austenitized at 950°C for 30 minutes. The TMTed specimen (T) was obtained by forging the specimen continuously as the temperature of the specimen was decreasing from 950°C to 600°C followed by oil quenching to room temperature. The thickness reduction ratio by forging is 40%. The conventional specimen (C) was obtained by quenching the specimen directly into room temperature oil after austenitized at 950°C for 30 minutes. All quenched specimens (T and C) were then tempered at 450, 500, 550, 600 or 650°C for four hours respectively.

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