The rheological and crystallization behavior of polyoxymethylene
详细信息 查看全文
- 作者：Felice De Santis ; fedesantis@unisa.it ; Cristiano Gnerre ; Maria Rosella Nobile ; Gaetano Lamberti
- 关键词：Polyoxymethylene ; DSC ; Crystallization kinetics ; Rheology ; Solidification
- 刊名：Polymer Testing
- 出版年：2017
- 出版时间：February 2017
- 年：2017
- 卷：57
- 期：Complete
- 页码：203-208
- 全文大小：1280 K
- 卷排序：57
文摘
In the polymer melt processing, the solidification has a huge importance on the properties of the resulting part. For a semi-crystalline resin, this phenomenon involves a complex interplay between crystallization and the material rheology. In this work, an investigation is carried out on the influence of thermal conditions on crystallization kinetics and rheology of two commercial polyoxymethylene (POM) copolymers. In particular, isothermal crystallization experiments using differential scanning calorimetry (DSC) and rotational rheometry to measure the dynamic viscosity are performed. The evolution of the relative crystallinity and Normalized Rheological Function (NRF) are correlated by a recent technique which allows simultaneous analysis of several measurements, even if they are not carried out at same temperatures. On this basis, a relationship between the crystallinity and the hardening, i.e. the sharp increase in the viscosity, is obtained.