Material characterization of a polyester resin system for the pultrusion process

作者：Baran Ismet^*; Akkerman Remko; Hattel Jesper H

来源：Composites Part B: Engineering , 2014, 64: 194-201.

DOI：10.1016/j.compositesb.2014.04.030

• Thermosetting resin
• Cure behaviour
• Rheological properties
• Mechanical properties

In the present work, the chemo-rheology of an industrial %26quot;orthophthalic%26quot; polyester system specifically prepared for a pultrusion process is characterized. The curing behaviour is first characterized using the differential scanning calorimetry (DSC). Isothermal and dynamic scans are performed to develop a cure kinetics model which accurately predicts the cure rate evolutions and describes the curing behaviour of the resin over a wide range of different processing conditions. The viscosity of the resin is subsequently obtained from rheological experiments using a rheometer. Based on this, a resin viscosity model as a function of temperature and degree of cure is developed and predicts the measured viscosity correctly. The evolution of the storage and loss moduli are also measured as a function of time using the rheometer which provides an information about the curing as well as the gelation. The temperature- and cure-dependent elastic modulus of the resin system is determined using a dynamic mechanical analyzer (DMA) in tension mode. A cure hardening and thermal softening model is developed and a least squares non-linear regression analysis is performed. The variation in elastic modulus with temperature and phase transition is captured for a fully cured resin sample.

• 出版日期2014-8