• Title, Summary, Keyword: Reinforcing Filler

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A Study on the Reinforcing Effects of Inorganic Filler Contained NR Vulcanizates with Temperature and Loading Variation. (무기충전제(無機充塡劑)를 변량배합(變量配合)한 천연(天然)고무 가황체(加黃體)의 온도변화(溫度變化)에 따른 보강성효과(補强性效果)의 연구(硏究))

  • Choi, Jae-Woon;Hong, Chung-Sug;Chun, Kyung-Soo
    • Elastomers and Composites
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    • v.22 no.4
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    • pp.293-304
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    • 1987
  • The purpose of this study is to examine the effect of rubber-filler attachments on inorganic filler contained NR vulcanizatic. The results of this study showed as follows. The reinforcing properties and damping values of the vulcanizates in the elastic region showed strong relation with the filler characteristics and temperture. The vulcanizates filled with nature-activated inorganic filler like silica had higer elastic modulus and damping values than the vulcanizates of nature-nonactivated inorganic filter. The reinforcing effects of differential filler loadings on NR raised the effects with temperature rise, but the damping values varied with the filler characteristics and temperature variations.

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Effects of Inorganic Fillers on Mechanical Properties of Silicone Rubber

  • Kim, Gyu Tae;Lee, Young Seok;Ha, KiRyong
    • Elastomers and Composites
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    • v.54 no.2
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    • pp.142-148
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    • 2019
  • In this study, the effects of filler particle size and shape on the physical properties of silicone rubber composites were investigated using inorganic fillers (Minusil 5, Celite 219, and Nyad 400) except silica, which was already present as a reinforcing filler of silicone rubber. Fillers with small particle sizes are known to facilitate the formation of the bound rubber by increasing the contact area with the polymer. However, in this experiment, the bound rubber content of Celite 219-added silicone composite was higher than that of Minusil 5-added silicone composite. This was attributed to the porous structure of Celite 219, which led to an increase in the internal surface area of the filler. When the inorganic fillers were added, both thermal decomposition temperature and thermal stability were improved. The bound rubber formed between the silicone rubber and inorganic filler affected the degree of crosslinking of the silicone composite. It is well-known that as the size of the reinforcing filler decreases, the reinforcing effect increases. However, in this experiment, the hardness of the composite material filled with Celite 219 was the highest compared to the other three composites. Furthermore, the highest value of 2.19 MPa was observed for 100% modulus, and the fracture elongation was the lowest at 469%. This was a result of excellent interaction between Celite 219 filler and silicone rubber.

Interfacial Characterization of Mineralized Carbon Nanotubes (광물화된 탄소나노튜브 첨가재의 계면 특성화)

  • Park, Chanwook;Jung, Jiwon;Yun, Gunjin
    • Composites Research
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    • v.31 no.5
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    • pp.282-287
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    • 2018
  • In this paper, we explore interfacial properties of the mineralized CNTs when they are employed as reinforcing fillers in a polymer nanocomposite using molecular dynamics (MD) simulations. Recently, several studies on mineralizing carbon nanotubes (CNTs) with an aid of nitrogen doping to CNTs have been reported. However, there is a lack of studies on the reinforcing effects of the mineralized CNTs when it is employed as a filler of nanocomposites. Silica ($SiO_2$) is used as a mineral material and poly (methyl metacrylate) (PMMA) is used as a polymer matrix. Pull-out simulations are conducted to obtain the interfacial energy and the interfacial shear stress. It was found that the silica mineralized CNTs have higher interfacial interaction with the polymer matrix. In the future, by examining various thermomechanical properties of the mineralized-CNT-filler/polymer nanocomposites, we will search for potential applications of the novel reinforcing filler.

Cure Characteristics, Mechanical Properties and Abrasion Resistance of Silica Filled Natural Rubber Vulcanizate

  • Lee, Hae Gil;Park, Chan Young
    • Elastomers and Composites
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    • v.50 no.3
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    • pp.159-166
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    • 2015
  • Silica which is used for reinforcing filler in tire industry is widely known as eco-friendly material exerting $CO_2$ reduction effect through decrease of rolling resistance and improvement of wet grip. Generally silica is classified as a highly polar filler because it contains a large number of silanol (Si-OH) group on its surface. And also silica gives a lower reinforcing effect than carbon black due to its poorer rubber-filler interaction. Therefore silica is treated with silane coupling agent or activator, then following the conventional rubber blend method, vulcanized sheets were prepared using a hot press, and cure characteristics, mechanical properties and abrasion resistance of the test specimens were investigated. It was found that with an increase in the silane coupling agent content the tensile strength, 300% modulus and abrasion resistance increased while Mooney viscosity decreased and crosslink density slightly increased with an increase of activator.

Infrared Studies of the Rubber-Filler System (가황(加黃)고무에 함유(含有)된 충전제(充塡劑)에 대(對)한 적외선분광분석(赤外線分光分析) 연구(硏究))

  • Su, Won-Dong;Paik, Nam-Chul
    • Elastomers and Composites
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    • v.13 no.2
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    • pp.99-107
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    • 1978
  • The measurement of the infrared absorption spectrum of supporting reinforcing filler which is oltained from the domestic area of Korea, Japan and U.S.A., is used by the method of KBr pellet. As a result of experiment, each absorption fond of the filler had appeared differently, because of each filler is consisted of different chemical composition, different crystalline form, different method of preparation, and the different ways of use etc. According to the above phenomena, each filler seems to have a different characteristic infrared absorption band, We can find what filler is used for sample rubber.

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Electrical properties of polyethylene composite films filled with nickel powder and short carbon fiber hybrid filler

  • Mironov, V.S.;Kim, Seong Yun;Park, Min
    • Carbon letters
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    • v.14 no.2
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    • pp.105-109
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    • 2013
  • Effects of the amount of nickel powder (Ni) in Ni-carbon fiber (CF) hybrid filler systems on the conductivity(or resistivity) and thermal coefficient of resistance (TCR) of filled high density polyethylene were studied. Increases of the resistivity and TCR with increasing Ni concentration at a given hybrid filler content were observed. Using the fiber contact model, we showed that the main role of Ni in the hybrid filler system is to decrease the interfiber contact resistance when Ni concentration is less than the threshold point. The formation of structural defects leading to reduced reinforcing effect resulted in both a reduction of strength and an increase of the coefficient of thermal expansion in the composite film; these changes are responsible for the increases of both resistivity and TCR with increasing Ni concentration in the hybrid filler system.

Acoustically-enhanced particle dispersion in polystyrene/alumina nanocomposites

  • Philip, Mercy A.;Natarajan, Upendra;Nagarajan, Ramamurthy
    • Advances in nano research
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    • v.2 no.2
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    • pp.121-133
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    • 2014
  • Polymer nanocomposites are advanced nanomaterials which exhibit dramatic improvements in various mechanical, thermal and barrier properties as compared with the neat polymer. Polystyrene/ alumina nanocomposites were prepared by an ultrasound-assisted solution casting method at filler loadings ranging from 0.2 to 2% and also at different ultrasonic frequencies, viz. 58 kHz, 192/58 kHz, 430 kHz, 470 kHz and 1 MHz. The composites were subjected to mechanical property tests (tensile and impact tests) and cavitation erosion tests to study the enhancement in functional properties. Filler dispersion in the polymer matrix was observed by SEM analysis. The effect of frequency on filler dispersion in the matrix was studied by SEM analysis and functional property enhancement of the composite material. The composites prepared at dual (high/ low) frequency (192/58 kHz) were found to show better property enhancement at low filler loadings as compared with neat polymer and also with composites prepared without ultrasound, thus reinforcing the finding that ultrasound-assisted synthesis is a promising method for the synthesis of nanocomposites.

A Study on Vulcanization Characteristics and Physical Properties for the Filler Compounded NR Vulcanizates.(II) (각종(各種) 충전제(充塡劑)를 배합(配合)한 천연(天然)고무의 가황체(加黃體)의 특성(特性)에 관(關)한 연구(硏究)(II)(가황특성(加黃特性) 및 물리적성질(物理的性質)))

  • Choi, Jae-Woon;Hong, Cheong-Seok;Herh, Dong-Sub
    • Elastomers and Composites
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    • v.20 no.1
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    • pp.13-24
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    • 1985
  • It is generally agreed that strong linkages exist between rubber chains and reinforcing filler particles. The purpose of this study is to examine the effect of rubber-filler attachments on the various mechanical properties of the rubber. In particular, the modulus and strength will be altered by these attachments. For this study, the curing properties are examined by means of ODR (Oscillating Disk Rheometer), the physical properties by means of Instrong. The results of this study can be summarized as follows. In the ODR test, the carbon black filled stock has shorter scorch time than gum stock and, the silica and clay filled stock has longer scorch time than gum stock. In the modulus, ten sile and swelling properties, the vulcanizates filled with carbon black had higher those values than inorganic filler loaded NR vulcanizates, but the rebound rate showed that the silica filled NR vulcanizates was lower than other inorganic filler contained NR vulcanizates and the ISAF filled NR vulcanizates was lower than other carbon block contained NR vulcanizates.

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Influence of Inorganic Filler on Properties of EPDM Compounds (무기 충전제가 EPDM 배합물의 특성에 미치는 영향)

  • Choi, Sung-Seen;Kim, Ok-Bae
    • Elastomers and Composites
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    • v.46 no.2
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    • pp.138-143
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    • 2011
  • EPDM compounds and vulcanizates containing inorganic filler such as talc, calcium carbonate, or clay as well as carbon black were prepared, and the influence of inorganic filler on properties of the EPDM compounds and vulcanizates were investigated. The bound rubber contents did not significantly increase even though the inorganic filler was added. There were big aggregates in the EPDM samples with high loading inorganic filler. By adding the inorganic filler, the cure times tended to increase and the delta torque decreased. The modulus were on the whole decreased, whereas the elongation at break, tensile strength, and tear strength were increased by adding the inorganic filler. The decreased modulus and increased elongation at break can be explained with the decreased delta torque, the increases of tensile strength and tear strength can be explained with the increased elongation at break. By adding the inorganic filler, level of reinforcing in the EPDM compounds did not increase and the crosslink density decreased.

Carboxylated Nitrile Elastomer/Filler Nanocomposite: Effect of Silica Nanofiller in Thermal, Dynamic Mechanical Behavior, and Interfacial Adhesion

  • Mahaling R. N.;Jana G. K.;Das C. K.;Jeong, H.;Ha C. S.
    • Macromolecular research
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    • v.13 no.4
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    • pp.306-313
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    • 2005
  • Surface modified nanofillers are often used as curative-cum reinforcing agents for functional polymers. The polymer nanofiller interaction depends on the curative systems used. In the present study the carboxylic group of the carboxylated nitrile elastomer participated in the reaction with Zn-ion coated nanosilica filler producing a type of ionomeric elastomer. The interaction at the molecular level thus produced a high modulus vulcanizate. In this case, the S and MBT system, as curative, had an edge over the MDA and DPG curative system. Interfacial adhesion was enhanced in the presence of Zn-ion-coated nanosilica filler associated with dynamic mechanical behavior. The inferior properties obtained in the case of the MDA and DPG curative system were due to the decreased reactivity of the silica surface, thus reducing interfacial adhesion.