Search Results

You are looking at 1 - 10 of 230 items for :

  • Refine by Access: All Content x
Clear All

Abstract  

Styrene is an important commodity chemical that is globally applied in various polymerization processes. The aim of this study was to obtain integrated thermokinetics and safety parameters for polymerization of styrene. We mainly used differential scanning calorimetry (DSC), thermal activity monitor (TAM), and simulative methods to investigate thermal polymerization of styrene and styrene containing various levels of 4-tertiary-butylcatechol (TBC). The results obtained included the rate constant (k), reaction order (n), apparent activation energy (E a), frequency factor (A), and so on, from various DSC curves and simulative methods. From DSC curves, the exothermic onset temperature (T 0) was about 105 and 132C for styrene and styrene containing 10 ppm TBC. On the other hand, the test results from TAM indicated that styrene polymerization displays an autocatalytic phenomenon from 50–85C. By means of this study, the intrinsic safety of a system for styrene during transportation and storage could be established.

Restricted access

Abstract  

The application of solution microcalorimetry was demonstrated on two model examples – inhibited oxidation of cumene and radical polymerization of styrene.From the experimental dependences of the rate of heat release on time, the rate constants k 7 of the interaction of an inhibitor with radicals of substrate (RO 2 . or R.) in oxidation or in polymerization were determined for the set of inhibitors of N-aryl N-(2-quinone) amine series. It was shown that these compounds are weak inhibitors of oxidation of cumene and rather efficient inhibitor of polymerization of styrene.

Restricted access

combustibility of styrene–butadiene rubber. The results of these investigations have been compared with influence of montmorillonite modified by means of various organic compounds on the same properties of styrene–butadiene rubber

Open access

composites containing different fillers were elucidated and compared. Experimental Materials Styrene–(ethylene butylene)–styrene (SEBS) triblock copolymer, Kraton G1650, with a styrene/rubber wt% ratio of 29

Restricted access

new epoxy polyester materials. This paper presents the studies on the thermal and viscoelastic properties of novel epoxy-dicyclopentadiene-terminated polyesters-styrene copolymers. The influence of the structure of polyester and styrene content on the

Open access

styrene polymers containing phosphorus or nitrogen/phosphorus moieties as pendants has been described [ 19 – 21 ]. Thermogravimetry TG was performed using a TA Instruments 2950 Hi-Res TG instrument interfaced with the

Restricted access

studied the kinetics of styrene oxidation over supported dodecatungstophosphate and undecaphosphotungstate using 30% aqueous H 2 O 2 as an oxidant. In the present article, we report the kinetic behavior of zirconia supported dodecatungstophosphate

Restricted access

[ 13 ]. In the previous study, we described the synthesis of new biocidal materials based on poly (chloromehtyl- p -styrene), in which the active organic compounds—hydantoin derivatives—were introduced instead of chlorine atoms in macro chains

Open access
Journal of Thermal Analysis and Calorimetry
Authors: Zuzana Cibulková, Andrea Černá, Peter Šimon, Ján Uhlár, Karol Kosár, and Peter Lehocký

measurements were also successfully employed to study the antioxidant action of several p -phenylenediamines, p -substituted diphenyl amines, heterocyclic compounds, trisubstituted amines and triazine derivatives in styrene-butadiene rubber (SBR) [ 7 , 8

Restricted access

Introduction ABS resin (styrene–butadiene–acrylonitrile) is one of the most successful engineering thermoplastics. It is widely used in the auto motive industry, telecommunications, business machines and consumer markets

Restricted access