Little Known Facts About pvc.
Little Known Facts About pvc.
Blog Article
UV-ljus och temperatur anses vara de faktorer som svarar för den huvudsakliga nedbrytningen vid utomhusåldring av plast. I likhet med andra plaster bryts PVC ned av solljus. Den fotokemiska nedbrytningen accelereras vid höjd temperatur.
PVC generation consists of a method generally known as polymerization, whereby monomers of vinyl chloride are chemically bonded to kind a polymer chain. The two principal varieties of polymerization used are suspension polymerization and emulsion polymerization.
Vid temperaturer upp till sixty°C är styv PVC resistent mot de flesta oorganiska vätskor inklusive moderat koncentrerade syror samt alkali och icke-oxiderande saltlösningar i alla koncentrationer.
این صفحه آخرین‌بار در ۲۳ ژانویهٔ ۲۰۲۵ ساعت ۱۵:۳۹ ویرایش شده است.
Expanded maritime PVC board or expanded PVC is a type of PVC that has been expanded that has a Distinctive foaming agent to enhance the thickness of the fabric while reducing its density. The foaming agent has been included in the look purposefully to lessen the amount plastic is applied.
ポリ塩化ビニルの「ポリ」という言葉は、ポリマー（重合体）からきたもので、「たくさん」という意味があります。しかし、一般的に呼ばれている「塩ビ」は塩化ビニルではなく、ポリ塩化ビニルを指しているケースが多いので注意が必要です。
型のなかにある空気を吸い取り、大気圧で型に押し付ける手法を「真空成形」、大気圧ではなく圧縮空気で金型に押し付ける手法を「圧空成形」と呼びます。
پلی‌وینیل کلراید به‌وسیلهٔ پلیمریزاسیون مونومر وینیل کلراید شکل می‌گیرد. تولید تجارتی قسمت اعظم پی‌وی‌سی عمدتاً از طریق بسپارش تعلیقی انجام می‌شود و از بسپارش‌های توده‌ای و امولسیونی به میزان کمتر و از بسپارش محلولی به ندرت استفاده می‌شود. پلی‌وینیل کلراید از بلورینگی ناچیزی برخوردار بوده اما به علت زنجیرهای حجیم بسپار (نتیجهٔ استخلاف بزرگ کلر) از استحکام و سختی برخوردار است. تی جی برای آن بالا و به میزان ۸۱ درجهٔ سانتی‌گراد است ولی میزان این تی جی آن‌قدر بالا نیست که فرایند با روش‌های گوناگون را دچار مشکل کند.
Flexible PVC is commonly Employed in construction as insulation on electrical wires or in flooring for homes, hospitals, schools, and other locations the place a sterile surroundings is important. Rigid PVC can also be Employed in design as pipe for plumbing and siding that is usually named
Suspension Polymerization: This is certainly the most typical strategy Utilized in PVC manufacturing. It entails the initiation of the response by no cost radicals, resulting in the polymerization of your vinyl chloride monomers suspended in water.
Springer Nature or its licensor (e.g. a Culture or other partner) holds special rights to this text under a publishing arrangement While using the writer(s) or other rightsholder(s); creator self-archiving from the approved manuscript Variation of this informative article is only ruled through the conditions of such publishing arrangement and relevant regulation.
Poly(vinyl chloride) (PVC) continues to be a captivating matter for polymer science study. Its qualities are heightened by its inherent structural faults resulting from immediate producing (by cost-free-radical polymerization), which also trigger its thermal instability. Many of the fundamental limiting functions of PVC have been prompt to be alleviated by enhanced chemistry for the duration of PVC synthesis, Along with the usage of the two inorganic and organic and natural thermal stabilizers. The features, characterization, modification, recycling, and several apps of PVC are all examined in this paper together with the previous and most recent exploration discoveries. It's been advised that some of the elemental limiting Homes of PVC might be lessened by making ابواب وشبابيك pvc use of the two inorganic and natural thermal stabilizers along with improved chemistry for the duration of PVC manufacture.
Main objective of the job should be to help the public to master some appealing and essential details about chemical features and plenty of popular supplies. We know that the basics in the supplies science may help people today to comprehend lots of frequent issues.
이 글은 화학에 관한 토막글입니다. 여러분의 지식으로 알차게 문서를 완성해 갑시다.