WebFeb 19, 2024 · This paper reports a detailed kinetic investigation on crystallization mechanisms occurring in two familiar industrial polyolefins, high-density polyethylene (HDPE) and isotactic polypropylene (iPP), under isothermal as … WebCrystallinity refers to the degree of structural order of a solid. In a crystal, the arrangement of atoms or molecules is consistent and repetitive. Many materials such as glass ceramics and some polymers can be prepared in such a way as to produce a mixture of crystalline and amorphous regions.
Crystallinity / Degree of Crystallinity - Analyzing & Testing
WebSep 15, 2015 · HDPE: HDPE has high crystalline and low amorphous regions (more than 90% crystalline). It contains several side chains per 200 carbon atoms in the main carbon skeleton leading to long linear chains. As a result, closely packing and high crystallinity can be observed (Figure 1). WebMany variables affect high-density polyethylene (HDPE) film's oxygen transmission rates (OTR), and water vapor transmission rates (WVTR). These variables include film crystalline structure, relaxation rates of molten polyethylene, ... measurement of crystallinity. Melt Index and Melt Flow Ratio Figure 3a shows the effect of MI and MFR on WVTR ... chinhan and ace
Difference Between HDPE and LDPE
WebAug 18, 2024 · The crystallinity values for nanocomposites using the crystallinity of pristine HDPE as a parameter, considering the proportion of HDPE in the nanocomposites, were calculated. The crystallinity values obtained did not show a correlation with Al 2 O 3 nanoparticle content. All nanocomposites showed a higher crystallinity degree than … WebThe aforementioned DSC results demonstrated that the total crystallinity of the PP/HDPE1 blends increases with increasing the HDPE1 content (as shown in Figure 4 ). The higher the crystallinity... WebApr 9, 2024 · They were characterized by a lower crystallinity degree of 70–74%, a moderate porosity of 12–28%, liquid permeability of up to 12–26 L m−2 h−1 bar−1, a mean flow pore size of up to 12–17 nm, and a higher tensile strength of 11–20 MPa. ... The Phase Diagram of the High-Density Polyethylene-m-Xylene System. Polym. Sci.-Ser. A 2015 ... chin hairs at 49