Polyurethane<\/span><\/strong>
\nPolyurethane is a resilient, flexible and durable manufactured material that can take the place of paint,\u00a0cotton, rubber, metal or wood in thousands of applications across virtually all fields. It can be hard like\u00a0fiberglass, squishy like\u00a0upholstery\u00a0foam, protective like\u00a0varnish, bouncy like rubber or sticky like glue. Since its invention during the 1940s, polyurethane has been used in a wide range of items, from baby toys to airplane wings, and it continues to be adapted for contemporary technology.<\/p>\n<\/div>\n

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This substance is categorized as a\u00a0polymer\u00a0\u2014 a molecule that consists of a series of repeating smaller units called monomers \u2014 based on its chemical structure. It is manufactured by combining two types of compounds, a diisocyanate and a diol, which are monomers, through a chemical reaction. This makes a basic material whose variations can be stretched, smashed or scratched and will remain fairly indestructible. Depending on the different diisocyanates and diol or polyol constituents, the resulting polyurethane might be in the form of a liquid, foam or solid. Each form has its own advantages and limitations.<\/p>\n<\/div>\n<\/div>\n
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Some polyurethane is categorized as an\u00a0elastomer. It has\u00a0elastic\u00a0properties while maintaining some rigidity, which is beneficial for items such as the wheels of a dolly, which must absorb shock without compressing too much. Polyurethane can be extremely flexible when used as a foam\u00a0insulator\u00a0in construction or a foam cushion in upholstery. It can be deformed over and over and still maintain its original shape. In other words, it has what is called structural memory.<\/p>\n
Face Modeling
\n $\"f2\"$ <\/a> $\"h1\"$ <\/a> $\"i6\"$ <\/a> $\"jj\"$ <\/a> $\"OLYMPUS$ $\"OLYMPUS$ <\/a>\u00a0\u00a0 $\"2014-07-11$ <\/a> $\"2014-07-11$ $\"2014-07-11$ $\"2014-07-10$ <\/a> $\"2014-07-11$
\n<\/strong><\/p>\n<\/div>\n<\/div>\n
Body\u00a0Modeling
\n $\"wip3\"$ <\/a> $\"wip\"$ <\/a>
\n<\/strong><\/p>\n
$\"wip1\"$ <\/a> $\"wip2\"$ <\/a><\/p>\n
Poli\u00fcretan<\/span><\/strong><\/span>
\nPoli\u00fcretan<\/span>\u00a0karbamat ba\u011flant\u0131lar\u0131 ile birle\u015ftirilen organik \u00fcniteler zincirinden olu\u015fan bir polimerdir. Esnek ve esnemeyen k\u00f6p\u00fckler, dayan\u0131kl\u0131 elastomerler ve y\u00fcksek performansl\u0131 yap\u0131\u015ft\u0131r\u0131c\u0131lar, sentetik fiberler, contalar, prezervatifler, hal\u0131lar\u0131n alt k\u0131sm\u0131 ve sert plastik yap\u0131m\u0131nda kullan\u0131l\u0131rlar. Esnek poli\u00fcretan k\u00f6p\u00fckler, poli\u00fcretan s\u00fcngerler olarak da bilinirler ve yataklarda, mobilyalarda konfor malzemesi olarak vazge\u00e7ilmezdirler. Esnemeyen k\u00f6p\u00fckler ise daha \u00e7ok \u0131s\u0131 ve ses izolasyonunda kullan\u0131l\u0131rlar. Poli\u00fcretan \u00fcr\u00fcnlere \u00e7o\u011fu zaman \u00fcretanlar da denir. Ancak etil karbamat olarak da bilinen \u00f6zel \u00fcretan maddesi ile kar\u0131\u015ft\u0131r\u0131lmamal\u0131d\u0131r. Poli\u00fcretanlar etil karbamatdan yap\u0131lmaz ve onu i\u00e7ermezler.

Poli\u00fcretanlar<\/span>\u00a0ilk kez Alman bilimadam\u0131 Otto Bayer taraf\u0131ndan 1937 y\u0131l\u0131nda sentezlenmi\u015f ve diizosiyanat\u0131n, diol ile reaksiyonuyla elde edilmi\u015ftir. E\u011fer ortamda su da varsa diizosiyanat\u0131n bir k\u0131sm\u0131 diol ile\u00a0polimerle\u015firken<\/span>\u00a0k\u00fc\u00e7\u00fck bir k\u0131sm\u0131 da su ile gaz (karbondioksit<\/span>) \u00e7\u0131k\u0131\u015f\u0131 reaksiyonu vererek g\u00f6zenekli\u00a0poli\u00fcretan<\/span>\u00a0yap\u0131y\u0131 (k\u00f6p\u00fck veya s\u00fcnger yap\u0131s\u0131<\/span>) meydana getirir. Olgunla\u015fma s\u00fcresi (24-72 saat) sonunda olduk\u00e7a sa\u011flam bir\u00a0polimer<\/span>\u00a0yap\u0131 elde edilir. Daha sonralar\u0131 diollerin yerini daha b\u00fcy\u00fck molek\u00fcl a\u011f\u0131rl\u0131kl\u0131,\u00a0polieter veya poliester yap\u0131s\u0131ndaki polioller\u00a0<\/span>alm\u0131\u015ft\u0131r. Bu \u015fekilde olu\u015fan poli\u00fcretan daha sa\u011flam ve daha esnek bir elastomer olu\u015fturur.
\n<\/span><\/p>\n
$\"222222\"$ <\/a> $\"444444\"$ <\/a> $\"111111111\"$ <\/a> $\"333333333\"$ <\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
Polyurethane Polyurethane is a resilient, flexible and durable manufactured material that can take the place of paint,\u00a0cotton, rubber, metal or wood in thousands of applications across virtually all fields. It can be hard like\u00a0fiberglass, squishy like\u00a0upholstery\u00a0foam, protective like\u00a0varnish, bouncy like rubber or sticky like glue. Since its invention during the 1940s, polyurethane has been used…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"open","template":"","meta":{"footnotes":""},"_links":{"self":[{"href":"http:\/\/sencersari.com\/wrd\/index.php?rest_route=\/wp\/v2\/pages\/553"}],"collection":[{"href":"http:\/\/sencersari.com\/wrd\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"http:\/\/sencersari.com\/wrd\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"http:\/\/sencersari.com\/wrd\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/sencersari.com\/wrd\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=553"}],"version-history":[{"count":6,"href":"http:\/\/sencersari.com\/wrd\/index.php?rest_route=\/wp\/v2\/pages\/553\/revisions"}],"predecessor-version":[{"id":1284,"href":"http:\/\/sencersari.com\/wrd\/index.php?rest_route=\/wp\/v2\/pages\/553\/revisions\/1284"}],"wp:attachment":[{"href":"http:\/\/sencersari.com\/wrd\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=553"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}