• 대한치과보철학회지
• /
• 제37권2호
• /
• pp.235-241
• /
• 1999

The bond failure of resin teeth In denture base resin is one of the failure in prosthodontic treatment. The purpose of this study was to evaluate the bond strength of artificial resin teeth to the denture base resins. Specimens were made with heat curing acrylic resins (Vertex Rs, Lucitone 199) and artificial resin teeth (Tiger, Trubyte biotone, Endura, Orthosit, Tubyte bioform IPN) and the bond strength were measured with testing machine(Zwick. Germany) and the mode of bond failure were observed. The results were as follows; 1. The bond strength of Vertex Rs to artificial resin teeth was the highest in Tubyte biotone, and It was the lowest in Tiger and Trubyte bioform IPN. 2. The bond strength of Lucitone 199 to artificial resin teeth were higher in Orthosit and Trubyte bioform IPN than in Tiger and Trubyte biotone. 3. The bond strength of Trubyte biotone to Vertex Rs was higher than to Lucitone 199 and that of the Trubyte bioform IPN to Lucitone 199 was higher than to Vertex Rs. 4. Nearly all bond failures of specimens occured cohesively within the resin teeth.

• 방사선산업학회지
• /
• 제4권3호
• /
• pp.271-276
• /
• 2010

Epoxy resin has wide application in various industrial fields because of their good mechanical strength, superiority adhesion and low shrinkage etc. And the typical curing method for epoxy resins is thermal and press compaction. However, a curing method was used electron beam process in this study. Epoxy acrylate was fabricated from mixture of epoxy, acrylic acid, tetraphenylporphyrin (TPP) and hydroquinone monomethyl ether (MEHQ) with mole ratios. Then electron beam irradiation effect on the curing of the epoxy acrylate resin was investigated various absorption dose in nitrogen atmospheres at room temperature. The dynamic mechanical and thermal properties of the irradiated epoxy acrylate resins were characterized using dynamic mechanical analysis (DMA) and thermogravimetric analyzer (TGA). And the tensile and flexural strength were measured by an universal tensile machine (UTM).

• 공업화학
• /
• 제16권1호
• /
• pp.39-44
• /
• 2005

본 연구에서는 HDI (hexamethylene diisocyanate)와 IPDI (isophorone diisocyanate), Polyol, 2-HEMA (2-hydroxy ethyl-methacrylate), n-BA (n-butyl acrylate) 그리고 MMA (methylmethacrylate)을 사용하여 폴리우레탄-아크릴 공중합 에멀젼 수지를 합성하였다. 또한 폴리올의 종류가 폴리우레탄-아크릴 에멀젼 수지의 제조 방법과 강도 및 내수성 등의 물성에 미치는 영향을 살펴 보았고 이를 아크릴 에멀젼 수지와 비교해 보았다. 실험 결과 폴리에스테르형 폴리올이 폴리에테르형 폴리올이나 아크릴 에멀젼보다 인장강도와 내수성 면에서 더 우수함을 보였다.

• 한국응용과학기술학회지
• /
• 제16권2호
• /
• pp.171-177
• /
• 1999

The objectives of this study is to investigate the optimum reaction conditions and to identify the product formula in the synthesis of a silicone/acrylic resin that curing in moisture at room temperature. By the addition polymerization of monomers, n-butyl acrylate, methyl methacrylate, n-butyl methacrylate, and 3-methacryloxypropyltrimethoxysilane. a quarter polymer was obtained. Among various initiators investigated in this study, 2.2'-azobisisobutyronitrille was found to be the most suitable initiator. The optimum reaction conditions found in this study are 70 wt% of initial solvent amount, 120 minutes of dropping time, 3 times of initiator addition, $82{\sim}105^{\circ}C$ of reaction temperature, and 8 hrs of reaction time. Also, number average molecular weight of $11700{\sim}33100$ and molecular weight distribution of $1.81{\sim}3.44$ were obtained.

• 보존과학연구
• /
• 통권6호
• /
• pp.247-258
• /
• 1985

Conservation laboratory was attached to Keimyung University Museum inMarch 1980 and ever since it has been devoted mainly to the processing andconservation of metal objects. A number of objects have been processed inthis laboratory during the period, including those already in the collection ofthe Museum, those which were discovered during the three major excavationsof Kaya tombs conducted by the Museum, and those processed on commissionfrom other museums in the country,The activities of this laboratory include: (1) conserving the objects againstfurther erosion; (2) raising the archaeological value of the objects by revealingthe structure of such parts of the objects as concealed under rust; and (3)recovering the original shape of damaged objects.The methods adopted by the laboratory include: (1) removing from theobjects the ionized chlorine which usually are the major cause of erosion; (2)strengthening the objects by soaking them in acrylic resins; and (3) applyingresins to the surface of the objects to protect them from further erosion.Chemicals much employed by the laboratory includes the acrylic resin(Ruschot; developed jointly by the Cultural Property Research Institute ofKorea and Samwha Paint Company), the sodium sesquicarbonate, the sodiumhydroxide, the lithium hydroxide, and the benzotriazole.Major apparatus in the laboratory includes the vacuum immersion tank, theairbrasive, the ultrasonic cleaner, the pH-ion meter, the water bath, the zoomstereo microscope, the drying oven, and the drill.

• Macromolecular Research
• /
• 제14권5호
• /
• pp.517-523
• /
• 2006

The effects of particle content, size and shape on the thermal conductivity (k) and adhesion properties of thermally conductive, pressure-sensitive adhesives (PSAs) were investigated. The matrix resins were thermally crosslinkable, 2-ethylhexyl acrylic polyol and ultraviolet (UV)-curable, random copolymer consisting of acrylic oligomer and various acrylates. We found that k increased with increasing diameter and particle aspect ratio, and was further enhanced due to the reduction of the interfacial thermal barrier when the coupling agent, which increases the adhesion between particles and the matrix resin, was used. On the other hand, adhesion properties such as peel strength and tack of the thermally crosslinkable resin decreased sharply with increasing particle content. However, for UV curable resin, increased particle addition inhibited the decrease in adhesion properties.

• 대한치과보철학회지
• /
• 제44권5호
• /
• pp.503-513
• /
• 2006

Statement of the problem: The cold-cured resins used in fabrication of the provisional crown and fixed partial dentures could cause pulpal damage by heat generated during exothermic polymerization reactions. Purpose: In this in vitro study investigates the how external conditions such as material of the matrix, thickness of the matrix and thickness of dentin affect the temperature of the tooth during polymerization reaction of the cold-cured resins. Material and methods : To measure the temperature of the resin, metal die was maintained to the temperature of $37^{\circ}C$ with water bath to simulate the temperature of thetooth and thermocouple was placed in the center of the metal die. Acrylic pipe was cut in height of 1, 2, 3, 6, 10 mm and placed on the metal die and mixed resin was pored in the acrylic pipe As the resin polymerized temperature was recorded with the thermometer. Temperature of the resin using matrix was recorded by using the individual tray relieved in different thickness 2, 5, 7, 10 mm. The material of the matrix was irreversible hydrocolloid impression material, vinyl polysilloxane impression material and vacuum-formed template Temperature rise of the resin using different thickness of tooth section was record ed by placing tooth section on the metal die and placing resin over the tooth section. Results : Conclusion : 1. Temperature rise increased as the thickness of the resin increased but there was no significant differences over 3 mm thickness of the resin. 2. The lowest temperature rise was showed in irreversible hydrocolloid impression material and vinyl polysilloxane impression material vacuum-formed template as in orders. 3, Temperature rise of the resin decreased regardless of the thickness of the matrix when vinyl polysilloxane impression material was used as the matrix. 4 When irreversible hydrocolloid impression material was used as matrix, the temperature rise of the resin decreased as the thickness of the matrix increased and there was no temperature rise when thickness of the matrix reached 10 mm, 5. The temperature rise of the resin did not decreased when Polypropylene vacuum-formed template was used as the matrix. 6, The temperature of the resin increased as the thickness of the dentin decreased.

• 접착 및 계면
• /
• 제11권4호
• /
• pp.155-161
• /
• 2010

점착부여수지의 종류와 함량을 달리하여 에틸렌비닐아세테이트 공중합체(Ethylene Vinyl Acetate Copolymer, EVA)를 베이스 폴리머로 하는 핫멜트 접착제를 제조하고, 그것들의 유변학적 거동과 폴리우레탄 기재에 대한 T-peel 접착력을 평가하였다. C5 지방족 석유수지, C9 방향족 석유수지, 수소가 첨가된 디사이클로펜타디엔 석유수지 그리고, 디사이클로펜타디엔/아크릴 모노머 공중합 석유수지가 각각 핫멜트 접착제의 점착부여수지로 사용되었다. 점착부여수지의 산소 함량을 분석하여 점착부여수지의 극성도를 측정하였는데, 디사이클로펜타디엔/아크릴 모노머 공중합 석유수지가 다른 점착부여수지보다 산소 함량이 높은 것을 확인하였다. 디사이클로펜타디엔/아크릴 모노머 공중합 석유수지만이 EVA와 완전한 혼화성을 보였고, 핫멜트 접착제는 모든 조성에서 균일상을 나타내었다. 핫멜트 접착제와 폴리우레탄 기재와의 T-peel 접착력은 핫멜트 접착제 자체의 저장탄성계수(G')보다는 핫멜트 접착제에 첨가된 점착부여수지의 극성도에 의해서 좌우됨이 확인되었다.

• 한국도로학회논문집
• /
• 제13권4호
• /
• pp.19-28
• /
• 2011

본 연구에서는 도심지 열섬현상을 완화 시킬 수 있는 아크릴 수지와 차열안료를 혼합한 차열성 포장을 개발하였다. 태양 복사열에 의한 포장체의 온도상승을 모사한 실내 시험으로부터 $60^{\circ}C$의 포장 온도에서 차열성 포장이 $12^{\circ}C$ 이상의 온도 저감 효과를 나타냈다. 이러한 온도 감소 효과는 차열안료의 배합비가 증가함에 따라 증가하였고, 반면에 점도의 증가로 인하여 작업성은 떨어졌다. 이러한 결과로부터 아크릴 수지 대비 차열안료의 최적혼합비율을 15%로 결정하였다. 차열성 포장의 칸타브로 손실률은 일반 배수성 포장의 손실률 1/4 수준으로 골재 비산 저항성이 우수하게 나타났다. 휠트랙킹 시험결과 차열성 포장의 동적안정도가 일반 배수성 포장에 비해 두 배 증가하였다. 차열성 포장재의 높은 부착력으로 인하여 탈리에 의한 손상 가능성은 낮은 것으로 나타났다. 시험 시공 구간에서의 소음도 측정 시험 결과 일반 배수성 포장에 비하여 평균 3.7dB의 소음저감 효과가 있었고, 미끄럼 저항치는 일반 배수성 포장에 비해서 평균 30% 정도 높아 우수한 미끄럼 저항성을 가지는 것으로 판단된다. 투수 시험 결과 차열성 포장의 투수성은 일반 배수성 포장보다 다소 작았으나 국내 배수성 포장 기준을 만족하는 것으로 나타났다.

• 한국응용과학기술학회지
• /
• 제31권3호
• /
• pp.500-508
• /
• 2014

본 연구에서는 ethyl acrylate monomer(EAM)을 사용한 수용성 아크릴 수지를 합성한 후 monoammonium phophate를 수용액 상태로 녹인 뒤 이를 아크릴 수지에 함양을 달리한 시료를 준비하여 각각의 필름 상태 및 피혁 외부에 코팅하여 기계적 물성측정 및 열안정성 물성 측정 실시하여 각각의 시료를 비교 검토 하였다. DSC를 이용한 열안정성 측정 결과 monoammonium phosphate 함량이 높은 시료(WAC-APS3)의 Tm 값이 $410^{\circ}C$ 로 가장 높은 열안정성을 확인할 수 있었다. 내용제성 측정결과 아크릴 수지 및 브랜딩 된 수지 모두 높은 내용제성을 확인 할 수 있었다. 내마모성 측정결과는 monoammonium phosphate 함량이 높은 수지가 우수한 물성(68.729 mg.loss)을 보였으나, 인장 강도, 연신율 측정치에서는 monoammonium phosphate 함량이 높아질수록 물성이 저하되어 아크릴 수지의 인장력인 $1.505kgf/mm^2$ 보다 낮은 $1.275kgf/mm^2$ 이 측정되었으며, 연신율의 경우 수용성 아크릴 수지 단독 시료의 연신율인 425% 보다 낮은 384% 가 측정되었다.