Effect of temperature on hygroscopic thickness swelling rate of composites from lignocellolusic fillers and HDPE

Based on the reflection, absorption and multiple reflection attenuation principle of composite shielding, composite fiberboard with multiple electromagnetic shielding functions was developed according to the structure design, which was made by filling with mineral powder and stainless steel nets, and then sprayed single face with conductive paint. The results show that: electromagnetic shielding effectiveness of the product is above 60dB and reaches the better grade in 18.85MHz-1.46GHz; the product filled with magnetite powder has better comprehensive mechanical properties than the product filled with barite powder, and its modulus of rupture, modulus of elasticity, internal bonding strength and thickness swelling rate of water absorption all reach the Chinese national standards.

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Hygroscopic thickness swelling rate of composites from sawdust and recycled plastics

Wood Science and Technology ◽

10.1007/s00226-007-0163-4 ◽

2007 ◽

Vol 42 (2) ◽

pp. 161-168 ◽

Cited By ~ 21

Author(s):

Saeed Kazemi Najafi ◽

Azadeh Kiaeifar ◽

Mehdi Tajvidi ◽

Elham Hamidinia

Keyword(s):

Thickness Swelling ◽

Swelling Rate ◽

Recycled Plastics

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Influence of veneer thickness, mat formation and resin content on some properties of novel poplar scrimbers

Holzforschung ◽

10.1515/hf-2017-0188 ◽

2018 ◽

Vol 72 (8) ◽

pp. 673-680 ◽

Cited By ~ 6

Author(s):

Yahui Zhang ◽

Yue Qi ◽

Yuxiang Huang ◽

Yanglun Yu ◽

Yanjun Liang ◽

...

Keyword(s):

Mechanical Properties ◽

Shear Strength ◽

Compression Strength ◽

Surface Texture ◽

Absorption Rate ◽

Resin Content ◽

Modulus Of Rupture ◽

Thickness Swelling ◽

Bending Modulus ◽

Swelling Rate

AbstractThick poplar veneers (4–8 mm) have been finely fluffed to manufacture novel scrimbers by two paving ways, namely by random and laminated mat formations. The following properties of the scrimbers were evaluated: modulus of rupture (MOR) via static bending, modulus of elasticity (MOE), compression strength (CS), shear strength (SS), water absorption rate, thickness swelling rate (TSR) and width swelling rate. The results show that utilization of fluffed thicker veneers reduced the mechanical properties to a certain extent. The TSR of the scrimber was first improved and then weakened by increasing the thickness of the veneers. The scrimber prepared from 6-mm-thick veneers showed the best waterproof performance. The random and laminated mat formations affected the surface texture significantly but the mechanical properties and dimensional stability to a lesser extent. With increasing resin content, the waterproof performance of the scrimbers was improved, which was not otherwise expected. The mechanical properties remained essentially unchanged except for the shear strength.

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A Recrosslinkable Preformed Particle Gel for Conformance Control in Heterogeneous Reservoirs Containing Linear-Flow Features

SPE Journal ◽

10.2118/191697-pa ◽

2019 ◽

Vol 24 (04) ◽

pp. 1714-1725 ◽

Cited By ~ 3

Author(s):

Jingyang Pu ◽

Baojun Bai ◽

Ali Alhuraishawy ◽

Thomas Schuman ◽

Yashu Chen ◽

...

Keyword(s):

Oil Fields ◽

Effect Of Temperature ◽

Swelling Ratio ◽

Heterogeneous Reservoirs ◽

Preformed Particle Gel ◽

Flow Features ◽

Swelling Rate ◽

Equilibrium Swelling Ratio ◽

Preformed Particle Gels

Summary Preformed particle gels (PPGs) have been successfully applied to control conformance for mature oil fields because of their advantages over conventional in-situ gels. However, field applications have demonstrated that current particle gels cannot efficiently plug open fractures, fracture-like channels, or conduits that exist in many mature oil fields. The objective of this study is to systematically evaluate a new recrosslinkable-PPG (RPPG) product that can be used to efficiently control the conformance for abnormal features. The RPPG can swell to 38 times its initial volume, and the equilibrium swelling ratio is independent of the brine salinity. Temperature and the particle size showed a gradient effect on the swelling rate of the gel. Additionally, the particle gels can recrosslink to form a rubber-like bulky material in the large-opening features after placement that significantly enhances the plugging efficiency. We systematically evaluated the effect of temperature and RPPG swelling ratio on the recrosslinking time, the gel strength after crosslinking, and the gel thermostability. Coreflooding tests were run to test whether RPPG can significantly improve the fracture-plugging efficiency compared with a traditional PPG that cannot recrosslink after pumping. The RPPG can be customized for mature reservoirs with a temperature from 23 to 80°C with a controllable size from tens of nanometers to a few millimeters. The recrosslinking time can be controlled from 2 to 80 hours, depending on the swelling ratio and temperature. The gel elastic modulus after recrosslinking can achieve from 300 to 10 800 Pa, depending on the swelling ratio and the temperature. Coreflooding tests showed that the breakthrough pressure of the recrosslinked RPPG can reach up to 300 psi/ft for a fracture with a 0.2-cm aperture, which is more than five times higher than that of the conventional PPG.

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Improved Wettability and Dimensional Stability of Bamboo Timber by Coating Graphene/Silica Composites

International Journal of Polymer Science ◽

10.1155/2021/7053143 ◽

2021 ◽

Vol 2021 ◽

pp. 1-10

Author(s):

Jin Wang ◽

Ye Zhou ◽

Jingpeng Li ◽

Yongshun Feng ◽

Jian Zhang ◽

...

Keyword(s):

Dimensional Stability ◽

Photoelectron Spectroscopy ◽

Self Assembly ◽

Red Wine ◽

Hydrophobic Effect ◽

Immersion Test ◽

X Ray Diffraction ◽

Thickness Swelling ◽

X Ray ◽

Swelling Rate

Bamboo timber (BT) is a kind of natural porous material, and usually bamboo cracking and deformation are caused by the change of humidity in the environment. Inspired by the natural structure of the shell, a multilayer structure was designed to fabricate a kind of graphene/silica composite coating on the BT surface. The multilayer bamboo composite (FAS-RGO@SiO2BT) was prepared by using the self-assembly process of nanospherical silica on graphene followed by hydrophobic modification. A possible formation mechanism of FAS-RGO@SiO2BT was discussed by X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray analysis, X-ray photoelectron spectroscopy, and Fourier transform infrared spectroscopy. The FAS-RGO@SiO2BT has excellent hydrophobic properties for tea, orange juice, milk, coffee, blue ink, red wine, and green juice. Also, the FAS-RGO@ SiO2BT has an obvious hydrophobic effect on any of the various solutions with a pH of 1 to 14. In addition, after a 90-day immersion test, the water absorption rate of FAS-RGO@ SiO2BT is 9.7% and the thickness swelling rate is 0.5%. The wettability and dimensional stability of the FAS-RGO@SiO2BT are significantly improved compared to those of BT.

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PENGARUH TEMPERATUR PEREBUSAN JERAMI TERHADAP SIFAT FISIS MEKANIS PAPAN PARTIKEL

Jurnal Sains Natural ◽

10.31938/jsn.v4i2.88 ◽

2017 ◽

Vol 4 (2) ◽

pp. 157

Author(s):

M. I. Iskandar

Keyword(s):

Physical Properties ◽

Flexural Modulus ◽

Effect Of Temperature ◽

Internal Bonding ◽

Particle Board ◽

Thickness Swelling ◽

Mechanical And Physical Properties ◽

Extractive Substances ◽

Effect Of Treatment ◽

Internal Bonding Strength

Effect of Temperature of Straw Boiling on Mechanical and Physical Properties of Particle Board Levels of extractive substances in the straw as much as 10-15% and 12-18% silica content respectively. Two of these substances can inhibit good adhesion bonding between the particles during the sealing process. Treatment of straw boiling before gluing process can reduce the negative effects of extractive substances to the bonding adhesive. The purpose of this study was to determine the effect of temperature of the boiling straw on mechanical and physical properties of particle board. The tested physical properties included density, moisture content, thickness swelling and water absorption while the mechanical properties tested included flexural modulus, fracture modulus, internal bonding strength and screw holding strength. Analysisof statistic of the data used was Complete Random Design (RAL). The treatment consisted of a five-level with three replications so that the total number of trials was fifteen. To determine the effect of treatment carried out the Analysis of Variance. To determine the effect of treatment was significantly different would do a further test the Duncan's multiple range test. Processing data using SAS software, version 6123. The results showed an increase in the temperature of straw boiling was very significant and fluctuative on the properties of particle board and the moisture content, thickness swelling 24 hours, flexural modulus (MOE), fracture modulus (MOR), but did not significant affect the density and internal bonding strength. Boiling temperature 40⁰C on straw produce panels with the best qualities. The properties of particle board research results that met the requirements of Standard JIS A 5908: 215 only the density and moisture content.Keywords: temperature, boiling, straw, mechanical physical properties ABSTRAK Kadar zat ekstraktif dalam jerami sebanyak 10-15% dan kadar silika 12-18%. Dua zat tersebut dapat menghambat ikatan rekat yang baik antar partikel pada waktu proses perekatan. Perlakuan perebusan jerami sebelum proses perekatan dapat mengurangi pengaruh negatif zat ekstraktif terhadap ikatan rekat. Tujuan penelitian ini adalah untuk mengetahui pengaruh temperatur perebusan jerami terhadap sifat fisis mekanis papan partikel. Sifat fisis yang diuji meliputi kerapatan, kadar air, pengembangan tebal dan daya serap air sedangkan sifat mekanis yang diuji meliputi modulus lentur, modulus patah, keteguhan rekat internal dan kuat pegang sekrup. Analisis statistik data yang digunakan adalah Rancangan Acak Lengkap (RAL). Perlakuan terdiri dari lima taraf dengan ulangan sebanyak tiga sehingga jumlah total percobaan adalah lima belas. Untuk mengetahui pengaruh dari perlakuan dilakukan analisis ragam (Analysis of Variance). Untuk mengetahui pengaruh berbeda nyata perlakuan dilakukan uji lanjut dengan uji wilayah berganda Duncan. Pengolahan data menggunakan software SAS versi 6.123. Hasil penelitian menunjukkan peningkatan temperatur perebusan jerami berpengaruh sangat nyata dan fluktuatif terhadap sifat-sifat papan partikel dan kadar air, pengembangan tebal 24 jam, modulus lentur (MOE), modulus patah (MOR), tetapi tidak berpengaruh nyata terhadap kerapatan dan keteguhan rekat internal. Perebusan jerami pada suhu 40⁰C menghasilkan panil dengan sifat-sifat terbaik. Sifat-sifat papan partikel hasil penelitian yang memenuhi persyaratan Standar JIS A 5908:215 hanya kerapatan dan kadar air.Kata kunci: temperatur, perebusan, jerami, sifat fisis dan mekanis

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Influence of nanoparticle on hygroscopic thickness swelling rate of composites from hemp fiber and recycled plastic

Science and Engineering of Composite Materials ◽

10.1515/secm-2012-0091 ◽

2013 ◽

Vol 20 (1) ◽

pp. 1-6 ◽

Cited By ~ 3

Author(s):

Behzad Kord

Keyword(s):

Room Temperature ◽

Rate Parameter ◽

Thickness Swelling ◽

Hemp Fiber ◽

Morphological Findings ◽

Melt Compounding ◽

Recycled Polypropylene ◽

Swelling Rate ◽

Nanoclay Content

AbstractIn this study, the effect of nanoparticle on hygroscopic thickness swelling rate of composites from hemp fiber and recycled plastic was investigated. To meet this objective, hemp fiber was mixed with either virgin or recycled polypropylene (PP) at 50% by weight fiber loading. The samples were made by melt compounding and then injection molding. The concentration was varied as 0, 1, and 3 per hundred compounds (phc) for nanoclay. The amount of coupling agent was fixed at 2 phc for all formulations. The long-term thickness swelling rate of samples was evaluated by immersing them in water at room temperature for several weeks (up to 3000 h). The results indicated that whether or not virgin plastic is used has a significant effect on the thickness swelling of composites. The thickness swelling of the hemp fiber/recycled plastic composites was higher than those of virgin plastics. Furthermore, with the addition of nanoclay content in composites, thickness swelling decreased. The swelling rate parameter (KSR) of the composites was influenced by plastics virginity and nanoclay. The minimum KSR values were observed in composites made of 50VPP/50F/2C/3N. Morphological findings showed that samples containing 1 phc of nanoclay had higher order of intercalation and better dispersion.

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