Paper sizing study using pyrolysis

A particular type of cellulose esters are those formed with paper sizing agents such as alkylketene dimers (AKD) or alkenylsuccinic anhydride (ASA) [47], The reaction of cellulose with alkylketene dimers generates p-ketoesters  

R - C12H25, C14H29, CigH33, C18H37 The reaction with alkenylsuccinic acid anhydride forms ester acids O O 

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In this chapter, the pyrolysis of synthesized polymers, microstructure of their derived UHTC composite matrices, as well the preparation and properties of C/C-ZrB2-ZrC-SiC composites are investigated. Preparation and microstructures of the composites were studied in part I of the paper. The ablation behaviors and mechanical properties of the composites in a ground arc-jet wind tunnel and plasma torch with temperatures above 2000 °C and heating rate around 30K/s were studied in Part II. The major aims of these studies were to evaluate the possibility of producing a nano-size dispersed ZrB -ZrC-SiC matrix using these complex polymeric precursors, which are expected to exhibit improved oxidation and ablation resistance, compared to those composites with layered or large particle incorporated UHTC matrices. 

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