{"id":304420,"date":"2024-10-19T20:49:07","date_gmt":"2024-10-19T20:49:07","guid":{"rendered":"https:\/\/pdfstandards.shop\/product\/uncategorized\/bs-iso-177442004\/"},"modified":"2024-10-25T18:23:08","modified_gmt":"2024-10-25T18:23:08","slug":"bs-iso-177442004","status":"publish","type":"product","link":"https:\/\/pdfstandards.shop\/product\/publishers\/bsi\/bs-iso-177442004\/","title":{"rendered":"BS ISO 17744:2004"},"content":{"rendered":"<p>This International Standard describes procedures for determining the specific volume of plastics as a function of temperature and pressure in both the molten and solid states.<\/p>\n<p>The standard specifies the use of a piston-equipped apparatus in which the test sample, held in a measurement cell, is pressurized by means of the piston. Measurements under conditions of constant pressure or constant temperature can be made. In the constant-pressure mode, the maximum heating and cooling rates permissible are restricted to 5&nbsp;\u00b0C\/min.<\/p>\n<blockquote>\n<p>NOTE Higher heating and cooling rates can be used, but data will then have to be corrected for thermal gradients<sup>[13]<\/sup>.<\/p>\n<\/blockquote>\n<p>For the acquisition of data needed for processing design, it is recommended that the isobaric cooling method be used (see ISO&nbsp;17282). The result of this measurement cannot be used directly for injection-moulding simulation.<\/p>\n<p>By using these procedures, it is possible to obtain:<\/p>\n<ul>\n<li>\n<p><i>pvT<\/i> diagrams that represent the relationship which exists between pressure, specific volume and temperature for a given material;<\/p>\n<\/li>\n<li>\n<p>compressibility and volumetric thermal-expansion coefficients;<\/p>\n<\/li>\n<li>\n<p>information on first-order and glass transitions as a function of temperature and pressure.<\/p>\n<\/li>\n<\/ul>\n<p>Although thermoplastic polymers are currently tested down to room temperature using these procedures, it is emphasized that, at temperatures lower than <i>T<\/i><sub>g<\/sub>, the difficulty in achieving a true hydrostatic state is a source of uncertainty on the specific volume measurement.<\/p>\n","protected":false},"excerpt":{"rendered":"<p><b>Plastics. Determination of specific volume as a function of temperature and pressure (pVT diagram). Piston apparatus method<\/b><\/p>\n<table class=\"shortdes-table\" style=\"width: 100%\" border=\"0\" cellspacing=\"0\" cellpadding=\"0\">\n<tbody>\n<tr>\n<td>Published By<\/td>\n<td>Publication Date<\/td>\n<td>Number of Pages<\/td>\n<\/tr>\n<tr>\n<td><a href=\"https:\/\/pdfstandards.shop\/product-category\/publishers\/bsi\/\"><b>BSI<\/b><\/a><\/td>\n<td>2004<\/td>\n<td>28<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"featured_media":304426,"template":"","meta":{"rank_math_lock_modified_date":false,"ep_exclude_from_search":false},"product_cat":[1177,2641],"product_tag":[],"class_list":{"0":"post-304420","1":"product","2":"type-product","3":"status-publish","4":"has-post-thumbnail","6":"product_cat-83-080-01","7":"product_cat-bsi","9":"first","10":"instock","11":"sold-individually","12":"shipping-taxable","13":"purchasable","14":"product-type-simple"},"_links":{"self":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product\/304420","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/types\/product"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media\/304426"}],"wp:attachment":[{"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/media?parent=304420"}],"wp:term":[{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_cat?post=304420"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/pdfstandards.shop\/wp-json\/wp\/v2\/product_tag?post=304420"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}