UV-ljus och temperatur anses vara de faktorer som svarar fileör 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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در سال ۱۹۲۶ والدو سیمون از بیاف گودریچ روشی برای نرم کردن پیویسی بهوسیلهٔ مخلوط کردن آن با افزودنیهای گوناگون گسترش داد. نتیجه مادهای انعطافپذیر بود که به سادگی در فرایندها شرکت میکرد و به سرعت در استفادههای تجاری شایع شد.
این صفحه آخرینبار در ۲۳ ژانویهٔ ۲۰۲۵ ساعت ۱۵:۳۹ ویرایش شده است.
موارد استفادهٔ فراوانی برای پیویسی شامل: وینیل سایدینگ، علامت مغناطیسی کارتها، برش عمودی پنجرهها، صفحات گرامافون، لوله، لولهکشی، کانال و لوازم نصبکردنی، کیفهای ارزانقیمت، پنجرههای تاریک (بدون دید) و در شکل نرم آن برای لباس، اثاثیه یا لوازم داخلی نظیر پرده، کفسازی و ساختن سقف، پوستهٔ کابلهای الکتریکی، توپهای بازی سبکوزن وجود دارد.
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Despite the fact that you'll find certain purposes, we would not recommend an expanded PVC sheet, it remains substantially stronger plus more resilient than other comparable plastic products and solutions. As an illustration, it's going to provide a few years of use when put in as an upholstery foundation or even a seat back panel.
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Suspension Polymerization: This is the most typical method Utilized in PVC creation. It requires the initiation from the reaction by free radicals, bringing about the polymerization with the vinyl chloride monomers suspended in water.
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Poly(vinyl chloride) (PVC) has actually been a fascinating subject matter for polymer science study. Its features are heightened by its inherent structural faults resulting from direct producing (by free of charge-radical polymerization), which also induce its thermal instability. Some of the basic limiting characteristics of PVC have been suggested for being alleviated by enhanced chemistry throughout PVC synthesis, Besides the use of equally inorganic and organic thermal stabilizers. The features, characterization, modification, recycling, and a variety of programs of PVC are all examined With this paper along with the previous and newest analysis discoveries. شباك pvc It's been recommended that several of the fundamental limiting Houses of PVC can be lessened by making use of both of those inorganic and natural thermal stabilizers along side enhanced chemistry throughout PVC manufacture.
Following, the indicators arrive in a cluster of cells known as the atrioventricular (AV) node, wherever they decelerate. This slight hold off allows the ventricles to fill with blood. When the electrical signals reach the ventricles, the chambers agreement and pump blood on the lungs or to the remainder of the system.
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