Polyethylenes has the biggest market percentage in thermoplastic polymers. Several properties of these polymers makes them the most common polymer material in market. In here, we give information about the polyethylene polymers’ applications, properties adn types.
The acronym of polyethylenes is PE and it has the biggest market in polymer industry. Some of properties of polyethylenes are; chemical inactivity, low cost compared with other thermoplastic polymers and easy processing and production of them. Because of these properties, polyethylens constitutes the biggest market.
In general, there are two types of polyethylenes; low density polyethylenes(LDPE) and high density polyethylenes(HDPE). The main difference between LDPE and HPDE polymers is the molecular structure. LDPE polymers has branched molecular structure, and because of that it s called as low-density. But HDPE has much more linear molecular structure and higher crystallinity ratio which are give high-density property to HDPE polymers.
Because of that difference in molecular structure of these two polyethylene types, HDPE much more stiff and strong compared with LDPE. General applications of HDPE pipe production, bottles and other houseware products such as frame of windows.
General applications that LDPE polymer is used; wire insulation, squezeable bottles and bags, sheets, films etc.
Both LDPE and HDPE have same chemical respresentations which is (C2H4)n. ‘n’ means the number of monomers in LDPE and HDPE structures. Both of these types of polyethylenes are produced with addition polymerization method. Elasticity modulus of HPDE much more higher that which is 700 MPa for HDPE and 140 MPa for LDPE. Tensile strength of HDPE is twofold of LDPE, 30 MPa and 15 MPa respectively. In terms of degree of crystallinity, HDPE is 92% and LDPE is 55%. Glass transition temperatures of HDPE and LDPE are nearly same, -115C and -100C respectively. Melting temperatures are very close to each other that is 135C for HDPE and 115C for LDPE. Elongation charactristics of LDPE is much more higher than HDPE, which is 100-500% of original shape for LDPE and 20-100% for HDPE.
These are the main characteristics for HDPE and LDPE in terms of polyethylenes. Do not forget to leave your comments and questions about LDPE and HDPE properties and applications below. Your precious feedbacks are very important for us.