폴리-P-자일린
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폴리-P-자일린 속성
- 녹는점
- 403-409 °C
안전
폴리-P-자일린 C화학적 특성, 용도, 생산
개요
Poly-p-xylylenes (PPXs), generally referred to their tradename as parylenes, a unique class of polymers, are obtained by cyclophane-based chemical vapor deposition (CVD) polymerization for diverse material applications. The chemical inertness, high purity, flexibility, mechanical strength, and stability of parylenes offer enormous potential in surface modification, optoelectronics, and drug delivery systems and have demonstrated technological utility for coatings of industrial products (e.g., clinically used biomaterials and biomedical devices)[1].화학적 성질
The most significant property of poly-p-xylylene is its thermal stability. The crystalline melting point is 375-425°C and in an inert atmosphere the material is claimed to have a useful life of 10 years at 220°C. The thermal stability in air is not exceptional. Poly-p-xylylene also maintains useful properties at temperatures as low as - 200°C. The polymer has outstandingly good electrical insulation characteristics and is used as a dielectric in special capacitors.It may be noted that poly-p-xylylene is considerably less stable than polyp- phenylene owing to the presence of the relatively weak dibenzyllinkages. It may also be noted that the isomeric polyxylylenes have been prepared but poly-o-xylylene has a polymer melt temperature of 110°C whilst poly-mxylylene has a softening temperature of only 60°C; these polymers are therefore of no immediate interest.
용도
Poly-p-xylylene (PPX) is mainly used as protective coatings, e.g. in electronics, medical devices and paper products, or as sealing materials to prevent additives from leaking out of elastomers. PPX can also be used in micro-electro-mechanical systems, organic light-emitting diodes, or in biological and medical applications. A relatively new area of PPX research is the formation of reactive coatings. This can be achieved through the introduction of functional groups capable of reacting in a polymer-like reaction.제조 방법
When di-p-xylylene is pyrolysed, both methylene bridges are homolytically cleaved to give the reactive intermediate p-xylylene which spontaneously forms the linear polymer on cooling. Generally, the polymer is deposited (in the polymerization chamber) on to a cold condenser and then removed as film; alternatively, the polymer is deposited directly on to an object which is required to be coated. Typically, an average molecular weight of about 500000 is attained.폴리-P-자일린 준비 용품 및 원자재
원자재
준비 용품
폴리-P-자일린 공급 업체
글로벌( 7)공급 업체
공급자 | 전화 | 이메일 | 국가 | 제품 수 | 이점 |
---|---|---|---|---|---|
Shenzhen FCD Technology Co., Ltd | +8618668616292 |
fcd-sd@fcdtech.com | China | 8 | 58 |
Dayang Chem (Hangzhou) Co.,Ltd. | 571-88938639 +8617705817739 |
info@dycnchem.com | China | 52861 | 58 |
GIHI CHEMICALS CO.,LIMITED | +8618058761490 |
info@gihichemicals.com | China | 50003 | 58 |
폴리-P-자일린 관련 검색:
알루미늄 아세틸아세토네이트 코발트(II) 아세틸아세토네이트 하이드레이트 아세틸아세톤산 구리 디스프로슘 트리(2,2,6,6-테트라메틸-3,5-헵탄디오네이트) 아세틸아세토산 제2철 실버 아세틸아세토네이트
SALCOMINE
Tosylmethyl isocyanide
TERT-BUTYL ISOCYANIDE
DICHLORO(ETHYLENEDIAMINE)PLATINUM(II)
METHYL ISOCYANOACETATE
N-BUTYLISOCYANIDE
Benzyl isocyanide
Ethyl isocyanoacetate
TRIS(2,2,6,6-TETRAMETHYL-3,5-HEPTANEDIONATO)EUROPIUM(III)
PHENYLSELENOL
Tris(2,4-pentanedionato)chroMiuM(III)
1,1,3,3-TETRAMETHYLBUTYL ISOCYANIDE