Polymer Science and Technology

Abstract

iii I hereby declare that all information in this document has been obtained and presented in accordance with academic rules and ethical conduct. I also declare that, as required by these rules and conduct, I have fully cited and referenced all materials and results that are not original to this work. The aim of the study is to synthesize poly(dibromophenyleneoxide) and polyaniline separately applying different microwave energies (90-900 watt), water amounts (1-5 ml) and time intervals (2-10 min) and investigate the effects of these parameters on the percent conversion of the polymers. The synthesis of poly(dibromophenyleneoxide) (P), radical ion polymer (RIP) and crosslinked polymer (CLP) were achieved by using tribromophenol (TBP) and Ca(OH)2 via microwave energy in a very short time interval.

Influence of Dilauroyl Peroxide on Mechanical and Thermal Properties of Different Polypropylene Matrices

“…The crystallinity is indication of amount of crystalline region in polymer with respect to amorphous content. 18 The crystallinity of PP samples was calculated with the total enthalpy method; in all calculations, the heats of fusion at equilibrium melting temperature were 209 J/g for PP crystals. 19 Scanning Electron Microscopy (SEM).…”

Numerical simulation of concrete slabs strengthened with PTFE sheets subjected to blast load

“…PTFE is chemically inert and resistant to attacks from corrosive chemicals. PTFE is highly dense and has a high melting temperature which makes it highly stable at high temperatures and has high impact strength [6,7]. Figure 1 illustrates the idealization of a blast wave pressure-time history.…”

Laboratory Investigation of the Effects of Temperature and Moisture on Interface Shear Strength of Textured Geomembrane and Geosynthetic Clay Liner

“…The glass transition temperature of polyethylene and polypropylene was determined to be approximately -120 °C and -10 °C , respectively. Polyethylene has a melting temperature of 135 °C , while polypropylene has a melting temperature of 176 °C (Ebewele 1996). Thus, the behavior of both polymeric materials resides in the intermediate rubbery phase in most landfill applications.…”

“…Two main transition temperatures of polymers exist, displayed in Thermoplastic polymers experience a decrease in modulus with increasing temperature because the linear and branched molecules, which are not chemically tied together, allow the chains to slide past each other under increasing temperatures (Ebewele 1996). The glass transition temperature of polyethylene and polypropylene was determined to be approximately -120 °C and -10 °C , respectively.…”

“…Unlike water molecules where phase changes occur over a minimal temperature change, thermoplastic polymers change phases gradually over a larger temperature range (Ebewele 1996). Two main transition temperatures of polymers exist, displayed in Thermoplastic polymers experience a decrease in modulus with increasing temperature because the linear and branched molecules, which are not chemically tied together, allow the chains to slide past each other under increasing temperatures (Ebewele 1996).…”