• Composites Research
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• 제32권6호
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• pp.368-374
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• 2019

무기필러가 첨가된 현무암섬유 강화 에폭시 복합재료를 제조하여 그 특성을 평가하였다. 첨가된 무기필러는 각각 수산화마그네슘, 수산화알루미늄, 알루미나, 베마이트이며 이를 첨가제로한 에폭시 수지를 현무암섬유에 핸드레이업으로 함침시킨 후 hot pressing하여 수지 함침량이 30 wt%인 섬유복합재료를 제조하였다. LOI 평가 결과 BFRP의 LOI (28.9)는 에폭시 수지 (21.4)에 비해 향상된 것을 확인하였으며 무기필러가 첨가될 경우 그보다 더욱 향상되는 것을 확인하였다. 또한 무기필러가 첨가된 복합재료는 무기필러가 첨가되지 않은 복합재료에 비해 콘칼로리미터 시험에서 PHRR, THR, TSR 등이 감소하여 무기필러 첨가에 따른 난연 특성 향상을 확인하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 추계학술대회 논문집 학회본부 C
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• pp.822-824
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• 1998

The lithium polymer battery with polymer electrolyte is expected as a safe and long cycle life battery. This paper reports primarily the recent development results of a solid polymer electrolyte, which is a key point of the secondary battery system. The new type of polymer electrolyte was prepared under a dry Ar atmosphere by dissolving $LiCIO_4$ in a matrix of EC, PC and then dispersing polyacrylonitrile(PAN). Also adding some inorganic filler $Al_2O_3$. The dispersed solution heated at $120^{\circ}C$. The polymer electrolyte were characterized by EIS(Electrochemical Impedance Spectroscopy), TGA(Thermo Gravimetric analysis), DMA(Dynamic Mechanical Analyzer), DSC (Differential Scanning Calorimetry). The lithium ion yield is 0.29 when PAN-$Al_2O_3$ which was applied DC 5mV. The ionic conductivity of PAN, PAN-$Al_2O_3$ polymer electrolytes were showed $1.0{\times}10^{-4}S/cm$, $8.4{\times}10^{-4}S/cm$ at room temperature. When inorganic filler was added in the polymer electrolyte, ionic conductivity and lithium yield more larger than without inorganic filler.

• 펄프종이기술
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• 제41권2호
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• pp.1-6
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• 2009

The purpose of this study was to investigate effects of lignocellulosic fillers made of wood powder and inorganic fillers, such as GCC and PCC, on physical properties of papers. Mechanical treatment and chemical treatment were carried out subsequently for generating lignocellulosic fillers, and then inorganic filler and wood powder were mixed together, and then mechanically treated for making lignocellulosic fillers covered with inorganic fillers. Consequently the particle size of lignocellulosic fillers was higher than that of inorganic fillers, which led to lumen loading and simultaneously surface coverage of fine inorganic fillers. Lignocellulosic fillers contributed to the increase of both bulk and opacity of handsheets dramatically, but some of properties including tensile strength, brightness and roughness decreased compared to inorganic fillers.

• Elastomers and Composites
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• 제20권1호
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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.

• Restorative Dentistry and Endodontics
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• 제47권3호
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• pp.32.1-32.11
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• 2022

Objectives: This study aimed to evaluate the influence of inorganic composition and filler particle morphology on the mechanical properties of different self-adhesive resin cements (SARCs). Materials and Methods: Three SARCs including RelyX Unicem-2 (RUN), Maxcem Elite (MAX), and Calibra Universal (CAL) were tested. Rectangular bar-shaped specimens were prepared for flexural strength (FS) and flexural modulus (FM) and determined by a 3-point bending test. The Knoop microhardness (KHN) and top/bottom microhardness ratio (%KHN) were conducted on the top and bottom faces of disc-shaped samples. Sorption (Wsp) and solubility (Wsl) were evaluated after 24 hours of water immersion. Filler morphology was analyzed by scanning electron microscopy and X-ray energy dispersive spectroscopy (EDS). FS, FM, %KHN, Wsp, Wsl, and EDS results were submitted to 1-way analysis of variance and Tukey's post-hoc test, and KHN also to paired t-test (α = 0.05). Results: SARC-CAL presented the highest FS value, and SARC-RUN presented the highest FM. SARC-MAX and RUN showed the lowest Wsp and Wsl values. KHN values decreased from top to bottom and the SARCs did not differ statistically. Also, all resin cements presented carbon, aluminum, and silica in their composition. SARC-MAX and RUN showed irregular and splintered particles while CAL presented small and regular size particles. Conclusions: A higher mechanical strength can be achieved by a reduced spread in grit size and the filler morphology can influence the KHN, as well as photoinitiators in the composition. Wsp and Wsl can be correlated with ions diffusion of inorganic particles.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 C
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• pp.1292-1294
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• 1994

With the contact angle of phase epoxy resin on the inorganic filler(glass plate) surface treated with air plasma, we have studied about the interface between epoxy resin and glass plate as simple model of a glass fiber reinforced composite materials. The contact angle on the inorganic filler surface varied with surface treatment conditions. The contact angle significantly depends on plasma treating time and environment temperature of the oven.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1993년도 하계학술대회 논문집 B
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• pp.1233-1235
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• 1993

With the Contact angle of phase epoxy resin on the inorganic filler(glass plate) surface treated with air plasma, we have studied about the interface between epoxy resin and glass plate as simple model of a glass fiber reinforced composite materials. The contact angle on the inorganic filler surface varied with ambient temperature and surface treatment conditions.

• 전기의세계
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• 제29권8호
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• pp.524-531
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• 1980

In order to investigate the effect of inorganic dielectric fine particle mixed in Low Density Polyethylene on the deterioration by treeing, a comparative study for initiation and development of the tree has been carried out between the pure thin film specimen and the same geometrical specimen mixed with a constant weight percent by a defiend particle size of $Al_{2}$O$_{3}$ and SiO$_{2}$, having larger dielectric constants than that of the base material. According to the results, it has been observed that as increasing dielectric constant, the initiation of tree is expedited, however, the development of the tree reached at the surface of filler particles shows the suppressive trends. From these facts, a reasonable interpretation may be possible by considering the effect of intensified electrical field around the tip in the presence of filler particles, that the initiation and the development of tree are a mechanical break down process caused by Maxwell stress due to the concentration of electrical field at the tip. This suppressive effect is specifically suggestive for the reason that a discharge route must be constructed around the particle surface because of the intensified field strength near filler, which, in turn, reduces the geometrical curvature of the tip so that the local intensity of electrical field can be relaxed. Further more an experimental evidence for this assumption was able to observe in this investigation.

• 폴리머
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• 제37권2호
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• pp.184-195
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• 2013

아크릴 점착테이프는 자동차, 전기전자 및 디스플레이 모듈 접합에 사용된다. 본 연구는 이러한 모듈 접합에 사용되는 고강도 준구조형 점착테이프 제조를 위해 2-ethylhexylacrylate(2-EHA)와 acrylic acid(AAC)를 사용하여 UV 조사에 의한 광중합 및 점착테이프 제조를 위해 광경화를 진행하였고, AAC의 함량 및 무기물 충전제 $SiO_2$ 함량에 따라 아크릴 점착테이프의 물성에 미치는 영향을 고찰하였다. 공단량체로 사용된 AAC의 함량이 많을수록 아크릴고분자 사슬의 강직성이 증가하여 초기 점착력이 낮았고, 시간경과에 따라 점착력이 증가하였으며 테이프의 젖음성, 접촉각 및 SEM 이미지를 통해 확인할 수 있었다. 충전제를 첨가하지 않은 점착테이프의 박리강도와 전단접착강도는 반비례 관계였으나 충전제를 첨가하면 함량 증가에 따라 박리강도 증가와 함께 전단접착강도가 증가하는 비례관계를 보였다. 이러한 상관관계로부터 고강도 준구조형 접착물성을 필요로 하는 용도에 최적화된 아크릴 점착테이프를 제시할 수 있었다.

• 한국결정성장학회지
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• 제33권4호
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• pp.139-144
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• 2023

무기충진제와 가소성 폴리머로 이루어진 스톤페이퍼는 기존 종이의 원료인 펄프를 사용하지 않아 자연보존에 기여하고 생분해성을 가지게 되면 보다 친환경적인 소재로 사용이 가능하다. 현재 대부분의 스톤페이퍼는 가열압출성형법으로 제조하고 있어 작업성을 증진시키기 위해 세라믹 충진제의 양이 제한되어 다양한 물성을 가질 수 없다. 본 연구에서는 이러한 스톤페이퍼 조성을 용제를 사용한 액상으로 제조하게 됨으로써 세라믹 충진제 첨가량에 제한이 적고 생분해성 조절을 위한 첨가제 투입도 용이하였다. 폐패각인 굴껍질을 열처리하여 무기충진제로 사용하였고, 재활용 소재로도 쉽게 구할 수 있는 폴리비닐클로라이드를 유기결합제로 사용하였다. 일반적인 폴리비닐클로라이드용 유기용제를 사용하여 폴리비닐클로라이드를 용해시킨 후 무기충진제와 생분해성을 부여하기 위한 셀룰로스를 혼합하여 시트 형태로 가공하여 용제기반 스톤페이퍼를 제조하여 그 물성에 대해 분석하였다.