Polikarbonatlar — karbonat kislota va digidroksibirikmalarning murakkab poliefirlari. Umumiy for- mulasi [\u2014ORO\u2014S (o)\u2014]p, bu erda R \u2014 aromatik yoki alifatik qoldiq. Bu- lardan eng muhim sanoat ahamiyatiga ega bo’lganlari aromatik P. (makrolen, lek- san, yupilon, penlayt, sinvet, polikarbo- nat); 2,2 — bis-(4gidroksife-Nil) propan (bisfenol A) va bisfenol A b-n uning o’rinbosarlari 3,3′, 5,5′ \u2014 tetrabrom yoki 3,3′, 5,5′ \u2014 tet-rametilbisfenol A asosidagi aralash P. Bisfenol A (gomo- polikarbonat) asosidagi P. \u2014 amorf rangeiz poli-merlar; mol. m. (20-120)- 103, shaffof. Undan tayyorlanadigan 3 mm qalinlikdagi plastinka 88% yorug’likni o’tkaza-Di, dekstruktsiyalanish t-rasi 310-320\u00b0. P. fizik-mexanik xos- salari mol. m. kattaligiga bog’liq. Mol. m. 20 mingdan kichik bo’lgan P. mo’rt, mustahkamligi past, mol. m. 25 mingdan yukrri bo’lgan P. esa mexanik mustax- kamligi va elas-tikligi yuqori biolo- gik inert polimerlar. Ulardan tayyor- langan buyumlarni \u2014 100 dan 135\u00b0 gacha bo’lgan haroratlarda ishlatish mumkin. Sanoatda P. 3 xil usul b-n olinadi: 1) difenilkar-bonatni bisfenol A b-n vakuumda asoslar (mas, natriy metilat) ishtirokida 150-300\u00b0 da qayta Eteri- fikasiyalash; 2) bisfenol A ni eritmada piridin ishtirokida 25\u00b0 da fosgenlash; 3) bisfenol A ni fosgen b-n suvli ish- Qoriy muhitda va organik erituvchida* mas, metilenxlorid yoki tarkibida xlor bo’lgan erituvchilar ishtirokida fazala- raro polikondensasiyalash. P. avtomobilsozlikda, elektron va elektrotexnika sanoatida, maishiy va tibbiyot texnikasida, asbobsozlik va samolyotsozlikda, qurilishda konst- ruktsion material sifatida ishlatiladi. P.dan tayyorlangan oynalar qurilishda, issiqxonalarda, ko’p qavatli mustahkam shisha materiallar \u2014 trip-lekslar i.ch.da qo’llanadi.<\/p>\n","protected":false},"excerpt":{"rendered":"
Polikarbonatlar — karbonat kislota va digidroksibirikmalarning murakkab poliefirlari. Umumiy for- mulasi [\u2014ORO\u2014S (o)\u2014]p, bu erda R \u2014 aromatik yoki alifatik qoldiq. Bu- lardan eng muhim sanoat ahamiyatiga ega bo’lganlari aromatik … Read More<\/a><\/p>\n","protected":false},"author":1,"featured_media":99837,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[226],"tags":[],"class_list":["post-118886","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-p-harfi","entry"],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"ru","enabled_languages":["uz","kr","ru"],"languages":{"uz":{"title":true,"content":true,"excerpt":false},"kr":{"title":false,"content":false,"excerpt":false},"ru":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/posts\/118886","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/comments?post=118886"}],"version-history":[{"count":1,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/posts\/118886\/revisions"}],"predecessor-version":[{"id":118921,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/posts\/118886\/revisions\/118921"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/media\/99837"}],"wp:attachment":[{"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/media?parent=118886"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/categories?post=118886"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/milliycha.uz\/ru\/wp-json\/wp\/v2\/tags?post=118886"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}