scholarly journals The Film-Forming Characterization and Structural Analysis of Pectin from Sunflower Heads

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Xiaoxia Peng ◽  
Guang Yang ◽  
Qi Yue ◽  
Xiaomeng Ren ◽  
Yifa Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Water Drop ◽  
Hydroxypropyl Methylcellulose ◽  
Exchange Chromatography ◽  
Structure Property ◽  
Molecular Weights ◽  
Gelling Properties ◽  
Film Forming ◽  
Relationship Of ◽  
Penetration Time

A natural low-methoxyl pectin (termed AHP, DM = 25.9 % ) was extracted from dried heads of sunflower and showed better film-forming performance blended with hydroxypropyl methylcellulose (HPMC). The solutions and films of different HPMC/AHP blends were characterized by viscosity, transparency, mechanical properties, loss on drying, water drop penetration time (WDPT), disintegration and SEM. In order to analyze the structure-property relationship of film forming, AHP was separated by ion-exchange chromatography and characterized. The results showed that the blends were immiscible, but the formation of AHP gel would give the blended film better mechanical properties. AHP was fractionated into one neutral fraction and two acidic fractions (AHPA-1 and AHPA-2). The analytical results showed that AHPA-1 and AHPA-2 were identified to be homogalacturonan- (HG-) rich pectins with low DM, and the molecular weights of them were estimated to be 106 kDa and 226 kDa, respectively. Due to the high content of the HG domain, low DM and high molecular weights, AHP had excellent gelling properties induced by Ca2+ and was added to improve the film-forming properties of HPMC and to develop plant hollow capsules.

Structure-Property Relationship of Castor Oil Based Chain Extended Polyurethane/Starch Biocomposites

2010 ◽  
Vol 123-125 ◽  
pp. 371-374
Author(s):  
Siddaramaiah ◽  
Manjula Koregala Sidde Gowda ◽  
Joong Hee Lee
Keyword(s):  
Mechanical Properties ◽  
Water Uptake ◽  
Castor Oil ◽  
Structure Property ◽  
X Ray ◽  
Property Relationship ◽  
Structure Property Relationship ◽  
Relationship Of

Polyurethane (PU)/starch biocomposites have been prepared with different weight fractions of starch (viz., from 0 to 40 wt %). The fabricated PU/starch composites were characterized by mechanical properties and thermal (DSC and TGA) behaviors. Microcrystalline parameters were calculated using X-ray profile. Water uptake and its effect on mechanical properties have been evaluated.

Synthesis and properties of polyimides derived from bis(4-aminophenyl)isohexides

2016 ◽  
Vol 29 (2) ◽  
pp. 197-204 ◽  
Author(s):  
Xiaodong Ji ◽  
Jingling Yan ◽  
Xiuju Liu ◽  
Zikun Wang ◽  
Zhen Wang
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Glass Transition ◽  
Physical And Mechanical Properties ◽  
Amic Acid ◽  
Systematic Investigation ◽  
Structure Property ◽  
Free Standing ◽  
Structure Property Relationship ◽  
Relationship Of

Several partially bio-based polyimides have been successfully synthesized by polycondensation between bis(4-aminophenyl)isohexides with various commercial dianhydrides. Flexible and free-standing films were readily obtained from their poly(amic acid) or polyimide solutions. A systematic investigation of the structure–property relationship of polyimides highlights the significant impact of the isohexides moieties on their physical and mechanical properties (glass transition temperature, inherent viscosity, thermal stability, solubility, and mechanical properties). The results revealed that these polyimides exhibited comparable thermal stability and mechanical properties to those of petrochemical-based ones.

scholarly journals Structure–property relationship of nitramino oxetane polymers: a computational study on the effect of pendant chains

RSC Advances ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 3120-3127
Author(s):  
Yiding Ma ◽  
Yingzhe Liu ◽  
Tao Yu ◽  
Weipeng Lai ◽  
Zhongxue Ge ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Computational Study ◽  
Structure Property ◽  
Property Relationship ◽  
Structure Property Relationship ◽  
Relationship Of ◽  
Comprehensive Study

A comprehensive study of the effect of the structure of pendant chains on the energetic and mechanical properties of nitramino oxetane polymers has been conducted.

scholarly journals Evaluating the Performance of a Semiaromatic/Aliphatic Polyamide Blend: The Case for Polyphthalamide (PPA) and Polyamide 4,10 (PA410)

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3391
Author(s):  
Mateo Gonzalez de Gortari ◽  
Feng Wu ◽  
Amar K. Mohanty ◽  
Manjusri Misra
Keyword(s):  
Mechanical Properties ◽  
Viscoelastic Properties ◽  
Tensile Modulus ◽  
Processing Temperature ◽  
Structure Property ◽  
Partial Miscibility ◽  
Thermal Mechanical Properties ◽  
Heat Deflection Temperature ◽  
Relationship Of ◽  
Aliphatic Polyamide

This paper studies the structure–property–processing relationship of polyphthalamide (PPA) PPA/polyamide 4,10 (PA410) blends, via co-relating their thermal-mechanical properties with their morphology, crystallization, and viscoelastic properties. When compared to neat PPA, the blends show improved processability with a lower processing temperature (20 °C lower than neat PPA) along with a higher modulus/strength and heat deflection temperature (HDT). The maximum tensile modulus is that of the 25PPA/75PA410 blend, ~3 GPa, 25% higher than neat PPA (~2.4 GPa). 25PPA/75PA410 also exhibits the highest HDT (136 °C) among all the blends, being 11% more than PPA (122 °C). The increase in the thermo-mechanical properties of the blends is explained by the partial miscibility between the two polymers. The blends improve the processing performance of PPA and broaden its applicability.

scholarly journals Elucidating the Effect of Additive Friction Stir Deposition on the Resulting Microstructure and Mechanical Properties of Magnesium Alloy WE43

Metals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1739
Author(s):  
M. B. Williams ◽  
T. W. Robinson ◽  
C. J. Williamson ◽  
R. P. Kinser ◽  
N. A. Ashmore ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Magnesium Alloy ◽  
Surface Defects ◽  
Processing Parameters ◽  
Process Window ◽  
Structure Property ◽  
Friction Stir ◽  
Microstructure And Mechanical Properties ◽  
Alloy We43 ◽  
Relationship Of

In this work, the effect of processing parameters on the resulting microstructure and mechanical properties of magnesium alloy WE43 processed via Additive Friction Stir Deposition (AFSD), a nascent solid-state additive manufacturing (AM) process, is investigated. In particular, a parameterization study was carried out, using multiple four-layer deposits, to identify a suitable process window for a structural 68-layers bulk WE43 deposition. The parametric study identified an acceptable set of parameters with minimal surface defects and excellent consolidation for the fabrication of a bulk WE43 deposition. Microstructural, tensile, and fatigue life characterization was conducted on the bulk WE43 deposition and compared to commercially available wrought material to elucidate the process-structure-property-performance (PSPP) relationship of the AFSD process. This study shows that the bulk WE43 deposit exhibited a refined homogenous microstructure and a texture shift relative to the wrought material. However, a reduction in hardness and tensile behavior was observed in the as-deposited WE43 compared to the wrought control. Additionally, fatigue specimens extracted from the bulk deposition exhibited a decrease in life in the low-cycle regime but performed comparably to the wrought plate in the high-cycle regime. The outcomes of this study illustrate the potential of the AFSD process in additively manufactured structural load-bearing components made with magnesium alloy WE43 in the as-built condition.

Structure–property relationship of acceptor-substituted oligothiophenes

Tetrahedron ◽  
2010 ◽  
Vol 66 (45) ◽  
pp. 8729-8733 ◽  
Author(s):  
M.S. Wrackmeyer ◽  
M. Hummert ◽  
H. Hartmann ◽  
M.K. Riede ◽  
K. Leo
Keyword(s):  
Structure Property ◽  
Property Relationship ◽  
Structure Property Relationship ◽  
Relationship Of

Improvement of mechanical properties of chitosan-based films via physical treatment of film-forming solution

2015 ◽  
Vol 158 ◽  
pp. 66-72 ◽  
Author(s):  
Wasina Thakhiew ◽  
Manida Champahom ◽  
Sakamon Devahastin ◽  
Somchart Soponronnarit
Keyword(s):  
Mechanical Properties ◽  
Physical Treatment ◽  
Film Forming
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