Study on the Moisture Absorption Properties of Poly[acrylate-co-methacrylate]

2009 ◽  
Vol 610-613 ◽  
pp. 81-84
Author(s):  
Chun Xiao Zhang ◽  
Fu Chen Bai ◽  
Xi Yao Zhang ◽  
Jian Liu ◽  
Wan Xi Zhang
Keyword(s):  
Molecular Sieve ◽  
Moisture Absorption ◽  
Ammonium Persulfate ◽  
Solution Polymerization ◽  
Absorption Properties ◽  
Adsorption Ability ◽  
Relative Moisture ◽  
Sodium Bisulfate ◽  
Different Temperatures ◽  
Moisture Absorbent

Moisture-absorbent poly- (acrylate-co-methacrylate) was synthesized by solution polymerization, using N,N’-methylene bisacrylamide as the crossinglinking agent, sodium bisulfate and ammonium persulfate as the initiator. The moisture absorption properties of the copolymer in different temperatures and humidities have been systematically studied. Experimental results indicated that the moisture absorption behavior has been enhanced with the increase amount of methacrylate. Under different relative humidity, the moisture adsorption ability was distinct. When the relative moisture reached 40%, the humidity behavior became less evident. As the increase of moisture, the absorbency for moisture improves correspondingly. When the relative moisture get to 90%, the properties of this copolymer was obviously improved compared with the traditional materials, such as silica gel and molecular sieve.

scholarly journals Study on the hygroscopicity of PET foam sandwich structure

2021 ◽  
Vol 13 (4) ◽  
pp. 168781402110118
Author(s):  
Hao Liu ◽  
Jian He ◽  
Dongyuan Xie ◽  
Qichao Xue ◽  
Quansheng Peng
Keyword(s):  
Diffusion Coefficient ◽  
Protective Effect ◽  
Specific Surface ◽  
Sandwich Structure ◽  
Moisture Absorption ◽  
Absorption Curve ◽  
Absorption Properties ◽  
Relative Moisture ◽  
Absorption Performance ◽  
Good Agreement

Polyethylene terephthalate (PET) foam sandwich structure is widely used in the fields of construction, aerospace and shipbuilding. We have conducted research on its hygroscopic phenomenon. Take different sizes of GFRP panels, PET foam and PET foam sandwich structure for moisture absorption tests, analyze the data on the basis of the classic Fick’s law of diffusion to obtain the moisture absorption curves of each sample. And get the diffusion coefficient of the specimen. Then, we use the multi-physics software COMSOL to model and analyze the moisture absorption properties of the specified samples. The moisture absorption curve obtained by theoretical calculation was compared with the experimental moisture absorption curve, and the results showed that the two Good agreement. Tests have proved that the moisture absorption performance of PET foam is much greater than that of GFRP panel material, and the relative moisture absorption is related to the specific surface area of the sample. In the PET foam sandwich structure, the GFRP panel can effectively inhibit the hygroscopicity of the PET foam and has an excellent protective effect on the PET foam.

scholarly journals Torrefaction of Almond and Walnut Byproducts

2021 ◽  
Vol 9 ◽  
Author(s):  
Zach McCaffrey ◽  
Lennard Torres ◽  
Bor-Sen Chiou ◽  
Saulo Rocha Ferreira ◽  
Luiz Eduardo Silva ◽  
...  
Keyword(s):  
Physicochemical Properties ◽  
Moisture Absorption ◽  
Calorific Value ◽  
Dynamic Vapor Sorption ◽  
Energy Applications ◽  
Thermochemical Process ◽  
Heat Treated ◽  
The Us ◽  
Torrefied Biomass ◽  
Different Temperatures

While the US nut industry is growing, markets for nut by-products, particularly nutshells and tree prunings, have not kept pace. Torrefaction is a thermochemical process used to improve physicochemical properties of biomass for energy and other applications. The goal of the paper was to characterize the effects of a range of torrefaction conditions on the properties of nut by-product feedstock. The process consists of thermal treatment of biomass at a temperature between 200 and 300°C in the absence of oxygen, where final material properties of the torrefied biomass depend on the temperature, heating rate, and residence time. In general, torrefied biomass exhibits higher hydrophobicity and calorific value with reduced moisture absorption compared to untreated biomass, making it an ideal fuel source for energy applications compared to raw biomass. In this study, almond shells of soft, semi-soft, and hardshell varieties, as well as walnut shells and almond wood, were torrefied at two different temperatures (230 and 290°C) and three different residence times (20, 40, and 60 min) in order to characterize the physicochemical properties. The thermal behavior of raw and heat-treated biomass was investigated by TGA analysis, elemental analysis, pH, helium pycnometry, FTIR spectroscopy, and dynamic vapor sorption analysis.

A review investigating the influence of nanofiller addition on the mechanical, thermal and water absorption properties of cellulosic fibre reinforced polymer composite

2021 ◽  
pp. 152808372110575
Author(s):  
Adnan Amjad ◽  
Aslina Anjang Ab Rahman ◽  
Habib Awais ◽  
Mohd Shukur Zainol Abidin ◽  
Junaid Khan
Keyword(s):  
Surface Treatment ◽  
Water Absorption ◽  
Polymer Composites ◽  
Moisture Absorption ◽  
Low Cost ◽  
Natural Fibre ◽  
Great Promise ◽  
Absorption Properties ◽  
Reinforced Polymer ◽  
Fibre Reinforced Polymer

Composite holds great promise for future materials considering its advantages such as excellent strength, stiffness, lightweight, and cost-effectiveness. Due to rising environmental concerns, the research speed gradually changes from synthetic polymer composites to natural fibre reinforced polymer composites (NFRPCs). Natural fibres are believed a valuable and robust replacement to synthetic silicates and carbon-based fibres, along with biodegradability, recyclability, low cost, and eco-friendliness. But the incompatibility between natural fibre and polymer matrices and higher moisture absorption percentage of natural fibre limitise their applications. To overcome these flaws, surface treatment of natural fibre and nanofiller addition have become some of the most important aspects to improve the performance of NFRPCs. This review article provides the most recent development on the effect of different nanofiller addition and surface treatment on the mechanical, thermal, and wetting behaviour of NFRPCs. It concludes that the fibre surface treatment and nanofillers in natural fibre polymer composites positively affect mechanical, thermal and water absorption properties. A systematic understanding in this field covers advanced research basics to stimulate investigation for fabricating NFRPCs with excellent performance.

Contributions of the nanovoid structure to the moisture absorption properties of epoxy resins

1998 ◽  
Vol 36 (17) ◽  
pp. 3035-3048 ◽  
Author(s):  
Christopher L. Soles ◽  
Fernando T. Chang ◽  
Brett A. Bolan ◽  
Hristo A. Hristov ◽  
David W. Gidley ◽  
...  
Keyword(s):  
Epoxy Resins ◽  
Moisture Absorption ◽  
Absorption Properties

Mechanical, crystallisation and moisture absorption properties of melt drawn polylactic acid fibres

2014 ◽  
Vol 53 ◽  
pp. 270-281 ◽  
Author(s):  
Kazi M. Zakir Hossain ◽  
Andrew J. Parsons ◽  
Chris D. Rudd ◽  
Ifty Ahmed ◽  
Wim Thielemans
Keyword(s):  
Polylactic Acid ◽  
Moisture Absorption ◽  
Absorption Properties

Analysis Performance of Protein Modified Cellulose Fiber

2013 ◽  
Vol 821-822 ◽  
pp. 139-143
Author(s):  
Li Yang ◽  
Song Mei Bi ◽  
Lei Zhou ◽  
Ying Feng Wang
Keyword(s):  
Moisture Absorption ◽  
Cellulose Fiber ◽  
Optical Microscope ◽  
X Ray Diffraction ◽  
Fiber Morphology ◽  
Absorption Properties ◽  
X Ray ◽  
Protein Fiber ◽  
Degree Of Orientation ◽  
Ft Ir

In order to compare differences between the structure and properties of pupa protein fiber and rousi fiber ,test morphology and molecular structure of fiber by using optical microscope, X ray diffraction, fourier transform infrared spectroscopy (FT-IR) . The results show that:the two kinds of fiber morphology consistent with the ordinary viscose, the pupa protein fiber crystallinity and degree of orientation are higher than the rousi fiber, and rousi fibers contain small amounts of metal elements, the pupa protein fiber mechanical properties, moisture absorption properties and heat resistance are superior to rousi fiber.

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