Description:

Webinar

Exploring Plastic Crystallization Pathways: Insights from Fast Scanning Calorimetry and Rheometry

Xiaoshi Zhang, Ph.D.

Research Faculty Member

Penn State Behrend

Wednesday, December 13,  Webinar at 6:00 PM Pacific time

Abstract

In plastic manufacturing, understanding the interplay between processing conditions and the resulting properties of plastics is crucial. In this presentation, I will delve into the intricate relationship between processing conditions and the resultant properties of polymers, with a particular focus on nylons, PEEK, and their composites. Initially, I will discuss our recent research that utilizes Fast Scanning Calorimetry along with other technologies to unravel the complexities of crystallization pathways. We observe that through crystallization cooling pathways in a wide range from 10 K/s to 2000 K/s, kinetics and morphology can exhibit completely different behaviors, even under identical crystallization temperatures. Following this, I will examine the impact of shear on crystallization. Our exploration includes how rotational rheometry, employing Couette flow instead of traditional Poiseuille flow, broadens our understanding of shear-induced kinetics and morphological transitions. This is complemented by techniques such as synchrotron X-ray and X-ray CT, through which we will discuss intriguing observations in PEEK glass fiber and carbon fiber composites. Throughout the presentation, I will demonstrate how these methodologies significantly enhance our understanding of plastic processing, particularly in the context of injection molding. The insights gained are pivotal for the strategic manipulation of key processing parameters, such as injection velocity, pack pressure, and mold temperature. This knowledge is essential for optimizing the final properties of the manufactured parts.

Speaker Background

Registration deadline: Tuesday, December 12, 1:00 PM.

Registration may close earlier than the nominal deadline if capacity is reached.

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Webinar Timing: 6:00 PM.

(Zoom meeting room will open earlier)

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