{"id":2192,"date":"2022-02-24T12:35:13","date_gmt":"2022-02-24T12:35:13","guid":{"rendered":"https:\/\/wygplastic.com?p=2192"},"modified":"2022-04-05T09:42:18","modified_gmt":"2022-04-05T09:42:18","slug":"admin-december-14-2016-2","status":"publish","type":"post","link":"https:\/\/wygplastic.com\/ar\/admin-december-14-2016-2\/","title":{"rendered":"\u0628\u0648\u0644\u064a \u0643\u0631\u0628\u0648\u0646\u0627\u062a(PC)"},"content":{"rendered":"<div class=\"vc_row wpb_row vc_row-fluid\"><div class=\"wpb_column vc_column_container vc_col-sm-2\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><\/div><\/div><\/div><div class=\"wpb_column vc_column_container vc_col-sm-8\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><div class=\"vc_empty_space\"   style=\"height: 32px\"><span class=\"vc_empty_space_inner\"><\/span><\/div>\n\t<div class=\"wpb_text_column wpb_content_element  post-type\" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<table class=\" aligncenter\" width=\"686\">\n<tbody>\n<tr>\n<td width=\"556\">The following diagram shows the relative impact strength of\u00a0Polycarbonate when compared to the impact strength of other commonly used plastics such asABS , Polystyrene (PS), or Nylon&#8230;. 140 \u00b0C (284 \u00b0F) at 0.46 MPa (66\u00a0PSI) **&#8230; 59 MPa (8500\u00a0PSI) ***&#8230; 93 MPa (13500\u00a0PSI) ***&#8230; Polycarbonate (PC)plastic is used for many applications requiring high impact resistance and transparency&#8230;<\/td>\n<td width=\"130\"><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><div class=\"wpb_column vc_column_container vc_col-sm-2\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\"><\/div><\/div><\/div><\/div><div class=\"vc_row wpb_row vc_row-fluid\"><div class=\"wpb_column vc_column_container vc_col-sm-12\"><div class=\"vc_column-inner\"><div class=\"wpb_wrapper\">\n\t<div class=\"wpb_tabs wpb_content_element  post-type tab-style-two\" data-interval=\"0\">\n\t\t<div class=\"wpb_wrapper wpb_tour_tabs_wrapper ui-tabs vc_clearfix\">\n\t\t\t<ul class=\"wpb_tabs_nav ui-tabs-nav vc_clearfix text-big\"><li><a href=\"#tab-1777cee4-108d-3\">Properties and processing<\/a><\/li><li><a href=\"#tab-94e49bb9-fdc5-1\">Main transformation techniques for polycarbonate resins:<\/a><\/li><li><a href=\"#tab-1647079032500-2-8\">Environmental impact<\/a><\/li><\/ul>\n\t<div id=\"tab-1777cee4-108d-3\" class=\"wpb_tab ui-tabs-panel wpb_ui-tabs-hide vc_clearfix\">\n\t\t\n\t<div class=\"wpb_text_column wpb_content_element \" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<p>Polycarbonate is a durable material. Although it has high impact-resistance, it has low scratch-resistance. Therefore, a hard coating is applied to polycarbonate\u00a0eyewear\u00a0lenses\u00a0and polycarbonate exterior automotivecomponents. The characteristics of polycarbonate compare to those of\u00a0polymethyl methacrylate\u00a0(PMMA, acrylic), but polycarbonate is stronger and will hold up longer to extreme temperature. Thermally processedmaterial is usually totally amorphous,[7]\u00a0and as a result is highly\u00a0transparent\u00a0to\u00a0visible light, with better light transmission than many kinds of glass.Polycarbonate has a\u00a0glass transition temperature\u00a0of about 147\u00a0\u00b0C (297\u00a0\u00b0F),[8]\u00a0so it softens gradually above this point and flows above about 155\u00a0\u00b0C (311\u00a0\u00b0F).[9]\u00a0Tools must be held at high temperatures, generally above80\u00a0\u00b0C (176\u00a0\u00b0F) to make strain-free and stress-free products. Low\u00a0molecular mass\u00a0grades are easier to mold than higher grades, but their strength is lower as a result. The toughest grades have the highest molecularmass, but are more difficult to process.Unlike most thermoplastics, polycarbonate can undergo large plastic deformations without cracking or breaking. As a result, it can be processed and formed at room temperature using\u00a0sheet metal\u00a0techniques, such asbending on a\u00a0brake. Even for sharp angle bends with a tight radius, heating may not be necessary. This makes it valuable in prototyping applications where transparent or electrically non-conductive parts are needed,which cannot be made from sheet metal.\u00a0PMMA\/Acrylic, which is similar in appearance to polycarbonate, is brittle and cannot be bent at room temperature.<\/p>\n\n\t\t<\/div>\n\t<\/div>\n\n\t<\/div>\n\n\t<div id=\"tab-94e49bb9-fdc5-1\" class=\"wpb_tab ui-tabs-panel wpb_ui-tabs-hide vc_clearfix\">\n\t\t\n\t<div class=\"wpb_text_column wpb_content_element \" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<p>extrusion\u00a0into tubes, rods and other profiles including multiwallextrusion with cylinders (calenders) into sheets (0.5\u201320\u00a0mm (0.020\u20130.787\u00a0in)) and films (below 1\u00a0mm (0.039\u00a0in)), which can be used directly or manufactured into other shapes using\u00a0thermoforming\u00a0or secondaryinjection molding\u00a0into ready articlesPolycarbonate may become\u00a0brittle\u00a0when exposed to ionizing radiation above\u00a025\u00a0kGy\u00a0(J\/kg).[10<\/p>\n\n\t\t<\/div>\n\t<\/div>\n\n\t<\/div>\n\n\t<div id=\"tab-1647079032500-2-8\" class=\"wpb_tab ui-tabs-panel wpb_ui-tabs-hide vc_clearfix\">\n\t\t\n\t<div class=\"wpb_text_column wpb_content_element \" >\n\t\t<div class=\"wpb_wrapper\">\n\t\t\t<p><strong>Disposal<\/strong><\/p>\n<p>Studies have shown that at temperatures above 70\u00a0\u00b0C, and high humidity, polycarbonate will hydrolyze to\u00a0Bis-phenol A\u00a0(BPA).\u00a0After about 30 days at 85\u00a0\u00b0C \/ 96% RH, surface crystals are formed which for 70% consisted of BPA.[34]\u00a0BPA is a compound that is currently onthe list of potential environmental hazardous chemicals. It is on the watch list of many countries, such as United States and Germany<\/p>\n<p><strong>-(-OC6H4)2C(CH3)2CO-)-n\u00a0+ H2O\u00a0{\\displaystyle \\longrightarrow }\u00a0(CH3)2C(C6H4OH)2\u00a0+ CO2<\/strong><\/p>\n<p>The leaching of BPA from polycarbonate can also occur at environmental temperature and normal pH (in landfills).The amount of leaching increases as the discs get older. A study found that the decomposition of BPA in landfills (under anaerobic conditions)It will therefore be persistent in landfills. Eventually, it will find its way into water bodies and contribute to aquatic pollution<\/p>\n\n\t\t<\/div>\n\t<\/div>\n\n\t<\/div>\n\n\t\t<\/div>\n\t<\/div>\n<\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>The following diagram shows the relative impact strength of\u00a0Polycarbonate when compared to the impact strength of other commonly used plastics such asABS , Polystyrene (PS), or Nylon&#8230;. 140 \u00b0C (284 \u00b0F) at 0.46 MPa (66\u00a0PSI) **&#8230; 59 MPa (8500\u00a0PSI) ***&#8230; 93 MPa (13500\u00a0PSI) ***&#8230; Polycarbonate (PC)plastic is used for many applications requiring high impact resistance&hellip;<\/p>","protected":false},"author":1,"featured_media":2572,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[19],"tags":[],"class_list":["post-2192","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","category-19","description-off"],"_links":{"self":[{"href":"https:\/\/wygplastic.com\/ar\/wp-json\/wp\/v2\/posts\/2192","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wygplastic.com\/ar\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wygplastic.com\/ar\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wygplastic.com\/ar\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/wygplastic.com\/ar\/wp-json\/wp\/v2\/comments?post=2192"}],"version-history":[{"count":40,"href":"https:\/\/wygplastic.com\/ar\/wp-json\/wp\/v2\/posts\/2192\/revisions"}],"predecessor-version":[{"id":2633,"href":"https:\/\/wygplastic.com\/ar\/wp-json\/wp\/v2\/posts\/2192\/revisions\/2633"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/wygplastic.com\/ar\/wp-json\/wp\/v2\/media\/2572"}],"wp:attachment":[{"href":"https:\/\/wygplastic.com\/ar\/wp-json\/wp\/v2\/media?parent=2192"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wygplastic.com\/ar\/wp-json\/wp\/v2\/categories?post=2192"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wygplastic.com\/ar\/wp-json\/wp\/v2\/tags?post=2192"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}