Thermal and Mechanical Analysis of N ‐Vinyl Pyrrolidone and N ‐Vinyl Caprolactam‐Based Polymers

Abstract

The techniques and methods used to measure thermal and mechanical properties are interrelated and routinely used to investigate the material properties of polymers. This chapter provides an overview of differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), and dynamic mechanical analysis (DMA) and delve into their application to study polymers based on vinyl pyrrolidone and vinyl caprolactam. DSC is an extremely useful tool for investigating the behavior of blends of PVP, with other polymers providing insight into their interactions and miscibility. TGA is a thermal technique that is used to monitor changes in polymer structure as a function of temperature. The chapter provides an introduction to TGA followed by its application and use to characterize VP‐based polymers. DMA is essential to study the mechanical properties of polymers. DMA is also known as dynamic thermomechanical analysis, dynamic mechanical thermal analysis, forced oscillatory measurements, or dynamic rheology.

Photopolymerization Inks for 3D Printing of Elastic, Strong, and Biodegradable Oral Delivery Devices

“…[41,49] An increasing concentration of NVP also increased the glass transition temperature (T g ) of the printed objects, as previously shown. [50] However, after extracting all leachable content from the printed objects, similar T g values were obtained for pA1-90 (T g ext = −38.9 °C), pA1-80 (T g ext = −38.6 °C), and pA1-70 (T g ext = −35.6 °C) (Figure S11 and Table S2, Supporting Information). These findings suggest that NVP undergoes homopolymerization during 3D printing, and these NVP oligomers are not chemically linked to the resulting network in all cases (Figure S9, Supporting Information).…”

The Low-Waste Grafting Copolymerization Modification of Chitosan Is a Promising Approach to Obtaining Materials for Food Applications

“…Additionally, the thermograms of graft copolymers have a flatter shape, and their residual masses are lower than those of the unmodified chitosan. This difference is quite noticeable in the region of 400–600 °C, where the thermal decomposition of PVP occurs [ 38 ]. Thus, the grafting of hydrophilic poly( N -vinylpyrrolidone) chains reduces the thermal stability of chitosan.…”

“…For graft copolymers, these signals are in the range of 234–242 °C. It is also worth noting that, for the copolymer with the highest PVP content, Cht- g -PVP-3, exothermic peaks of the decomposition of PVP links are observed at 404 and 411 °C, respectively [ 38 ], while, for the copolymer with the lowest PVP content, Cht- g -PVP-1, the signal is less pronounced, which is due to its lower content of grafted chains.…”