An Unbiased View of pvc
An Unbiased View of pvc
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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.
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Healthcare: The Health care sector employs PVC in a number of clinical units including blood luggage, tubing, and IV bags. Its power to be sterilized makes it suitable for these purposes.
The polymers are linear and therefore are solid. The monomers are mainly arranged head-to-tail, meaning that chloride is located on alternating carbon centres. PVC has mainly an atactic stereochemistry, meaning which the relative stereochemistry with the chloride centres are random. Some diploma of syndiotacticity of the chain provides a handful of percent crystallinity that is certainly influential over the properties of the material.
PVC was synthesized in 1872 by German chemist Eugen Baumann immediately after prolonged investigation and experimentation.[twelve] The polymer appeared for a white good inside of a flask of vinyl chloride that had been left on a shelf sheltered from sunlight for 4 months. During the early twentieth century, the Russian chemist Ivan Ostromislensky and Fritz Klatte of the German chemical business Griesheim-Elektron the two attempted to utilize PVC in business merchandise, but complications in processing the rigid, from time to time brittle polymer thwarted their endeavours.
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کارت‌های پی‌وی‌سی کارت‌هایی هستند که از پلاستیک فشرده تهیه شده و یکی از محصولات صنعت پتروشیمی هستند و مقاومت آن‌ها در مقابل گرما و سرما در مقایسه با کارت‌های کاغذی بسیار بالاتر بوده و دوام و ماندگاری آن نیز به دلیل نوع مواد به کار رفته در آن‌ها بیشتر است و بر اثر فشار یا ضربه آسیب نمی‌بینند.
پروفیل‌ها می‌توانند کاملاً از مواد خام ساخته شده باشند یا دارای یک هسته از ضایعات یا مواد بازیافتی باشند که این هسته می‌تواند توسط پی‌وی‌سی سخت و به‌وسیلهٔ کواکستروژن پوشش داده شده باشد.
Pure polyvinyl chloride is often a white, شيش حصير brittle stable frequently shipped as powder or pellets. It is actually insoluble in Alcoholic beverages but a little soluble in tetrahydrofuran.
Automotive: PVC can also be found in the automotive field for sections like dashboards, seat coverings, and insulation for wiring.
Poly(vinyl chloride) (PVC) is a captivating matter for polymer science research. Its attributes are heightened by its inherent structural faults resulting from immediate manufacturing (by no cost-radical polymerization), which also result in its thermal instability. A number of the elemental restricting capabilities of PVC are actually recommended being alleviated by improved chemistry all through PVC synthesis, Besides the use of each inorganic and natural and organic thermal stabilizers. The attributes, characterization, modification, recycling, and many programs of PVC are all examined in this paper combined with the earlier and newest investigate discoveries. It's been prompt that a number of the basic restricting Qualities of PVC is often lessened by applying both equally inorganic and natural and organic thermal stabilizers along side improved chemistry through PVC manufacture.
比較的小さな分子であるモノマーが、繰り返し結合したものをポリマーと呼びますが、この繰り返し結合した度合いのことを「重合度」と呼びます。
The carbon-chlorine bonds throughout the vinyl chloride models give PVC its distinctive properties, like resistance to environmental factors and electrical insulation.