This article describes our results for the thermal stability and thermal degradation of poly(alkyl methacrylates) based on selected methacrylate monomers, namely methyl methacrylate, butyl methacrylate, and 2-ethylhexyl methacrylate, which are used in the polymer industry in the manufacture of construction polymers, polymeric films, and a wide range of adhesives. Quantitative analyses of the thermal degradation products of poly(methyl methacrylate), poly(butyl methacrylate), and poly(2-ethylhexyl methacrylate) were performed, principally with pyrolysisgas chromatography at temperatures between 200 and 400°C. The dependencies of the thermal stabilities of the tested poly(alkyl methacrylates) on their molecular weight were investigated. The major degradation products are the corresponding methacrylate monomers; the other thermal degradation by-products are carbon dioxide, carbon monoxide, methane, ethane, methanol, ethanol, and 1-propanol.

Badano wp³yw zawartooeci (0,5-3,0 % mas.) zwi¹zków sieciuj¹cych -nadtlenku benzoilu (BPO) oraz nadtlenku dichlorobenzoilu (DClBPO) -na proces sieciowania wybranych samoprzylepnych klejów silikonowych (Si-PSA). Wszystkie badane samoprzylepne kleje silikonowe charakteryzowa-³y siê doskona³¹ adhezj¹ oraz du¿¹ wartooeci¹ kohezji. W wiêkszooeci przypadków zwiêkszenie udzia³u zwi¹zków sieciuj¹cych wp³ywa³o na zwiêkszenie kohezji i na zmniejszenie adhezji kleju. Stwierdzono, ¿e odpowiedni dobór nadtlenku organicznego pozwala na uzyskanie okreoelonych wartooeci kohezji i adhezji silikonowych klejów samoprzylepnych.

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This manuscript describes a novel class of copolymerizable benzophenone photoinitiators and their influence on viscosity and molecular mass of acrylic pressure-sensitive adhesives (PSAs) during radical solvent polymerization and shrinkage of acrylic PSAs coated on PVC film and crosslinked using UV radiation.

This article presents a new class of copolymerizable photoinitiators containing vinyloxycarbonyl groups, known such as organic carbonate or carbamate. Novel copolymerizable photoinitiators have been prepared through the reaction between vinyl chloroformate and hydroxyl groups containing photoreactive derivatives such as benzophenone-, acetophenone-, benzoine-and anthrachinone-derivatives. The main emphasis is given to the influence of this new class of unsaturated photoinitiators on UV-crosslinking process of acrylic pressure-sensitive adhesives (PSA). Moreover, the paper describes the influence of various parameters such as UV-initiated crosslinking time and concentration of unsaturated photoinitiators on relevant PSA properties like tack, peel adhesion and shear strength (cohesion).