Good water absorption:<\/strong> Nylon has high water absorption, and saturated water can reach more than 3%. This property may affect the dimension stability of the parts.<\/p>\n\n\n\nWhat is Polyester?<\/h2>\n\n\n\n Polyester is an umbrella term for fabrics containing one or two ester linkages in every repeat unit of their main chain. Generally speaking, polyester usually refers to polyethylene terephthalate (PTT).<\/p>\n\n\n\n
The history of polyester fiber can be traced back to 1894 when Vorlander used succinyl chloride and ethylene glycol to make low-molecular-weight polyester. In the following decades, different types of polyester were synthesized, but early polyesters were easily soluble in water due to their low molecular weight and low melting point, making them unsuitable for textile use. It was not until 1941 that Whinfield and Dickson in the UK synthesized polyethylene terephthalate (PET). In 1953, the United States first built a factory to produce PET fiber. With the development of organic synthesis, polymer science, and industry, we have developed a variety of practical PET fibers with different characteristics in recent years. For example, polybutylene terephthalate (PBT) fiber and polytrimethylene terephthalate (PTT) fiber have high elasticity, and fully aromatic polyester fiber has ultra-high strength and high modulus.<\/p>\n\n\n\n
Properties of Polyester<\/h3>\n\n\n\n Key characteristics and properties of polyester include:<\/p>\n\n\n\n
High strength: <\/strong>The strength is 4~7cN\/dtex in a dry state and slightly decreases in a wet state.<\/p>\n\n\n\nModerate elongation:<\/strong> Elongation at break is generally 20%~50%.<\/p>\n\n\n\nHigh modulus:<\/strong> Among synthetic fibers, polyester has the highest initial modulus, which can be as high as 14~17 GPa. This makes polyester fabrics dimensionally stable, not easy to deform and lose shape, and the pleats last long.<\/p>\n\n\n\nAcid resistance:<\/strong> Polyester is very stable to acids (especially organic acids). After being immersed in a 5% hydrochloric acid solution at 100\u00b0C for 24 hours or in a 70% sulfuric acid solution at 40\u00b0C for 72 hours, its strength is not lost.<\/p>\n\n\n\nComparison of Polyamide and Polyester<\/h3>\n\n\n\n Polyester and polyamide are two different types of materials with some differences, including the following aspects:<\/p>\n\n\n\n
Chemical structure:<\/strong> Polyester is made by the polymerization reaction of polyester compounds, in which the ester group is the main structural unit. Polyamide is made by the polymerization reaction of polyamide compounds, in which the amide group is the main structural unit. The different chemical structures of the two lead to differences in their properties and applications.<\/p>\n\n\n\nPhysical properties: <\/strong>Polyesters generally have higher strength and stiffness, while polyamides generally have higher toughness and impact resistance. Polyesters perform better in strength and are suitable for applications requiring higher mechanical properties, while polyamides perform better in toughness and are suitable for applications requiring impact resistance.<\/p>\n\n\n\nHeat resistance:<\/strong> Polyesters have relatively low heat resistance and are usually used at lower temperatures, while polyamides have higher heat resistance and can maintain stability at higher temperatures. Polyamides generally have higher glass transition temperatures and heat deformation temperatures and are suitable for applications in high temperature environments.<\/p>\n\n\n\nHygroscopicity: <\/strong>Polyesters have certain hygroscopicity, while polyamides generally have lower hygroscopicity and can maintain more stable dimensions.<\/p>\n\n\n\nApplication areas:\u00a0<\/strong>Due to their different performance characteristics, polyesters and polyamides differ in their application areas. Polyester is widely used in composite materials, construction, automobiles, electronics, coatings, etc. Polyamide is often used to prepare heat-resistant, wear-resistant, and chemical-resistant products, such as plastic parts, fibers, and coatings.<\/p>\n\n\n\n<\/p>","protected":false},"excerpt":{"rendered":"
Polyamid, oft abgek\u00fcrzt als PA, ist ein allgemeines synthetisches Polymer, wobei Polyester ein \u00dcberbegriff f\u00fcr Stoffe ist, die eine oder zwei Esterbindungen in jeder Wiederholungseinheit ihrer Hauptkette enthalten.<\/p>","protected":false},"author":1,"featured_media":12459,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_kad_post_transparent":"","_kad_post_title":"","_kad_post_layout":"","_kad_post_sidebar_id":"","_kad_post_content_style":"","_kad_post_vertical_padding":"","_kad_post_feature":"","_kad_post_feature_position":"","_kad_post_header":false,"_kad_post_footer":false,"footnotes":""},"categories":[14],"tags":[],"class_list":["post-12458","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-injection-molding"],"yoast_head":"\n
Polyamide vs Polyester: What Are the Differences<\/title>\n \n \n \n \n \n \n \n \n \n \n \n \n\t \n\t \n\t \n \n \n \n\t \n\t \n\t \n