12
P. Senthil Kumar and G. Janet Joshiba
7.3 Thermal Properties
The thermal properties and fire retardancy properties of the recycled polyesters encapsulated with magnesium hydroxide nanocomposites is investigated by Naugib. The
thermal properties are generally studies using thermal gravimetric analysis. The
results concluded that the nanocomposites enclosed recycled polyesters showed great
thermal properties because of the dehydration of Mg(OH) 2 and inhibition of CaO
layers [21]. The PET polymers are generally flammable materials and they do not
possess great fire retardancy characteristics. The fire retardancy characteristics of the
PET polymer fibers are enhanced by combining it with synthetic halogen composed
fire retardants [21]. Generally, the polyesters are prone to hydrolytic degradation
which affects the fire resistance properties of the fibers. To combat these defects the
processing of recycled polyesters are performed using the polycondensation method.
Delva et al. have utilized the Brominated polystyrenics combined with the recycled
polybutylene terephthalate for enhancing its fire reatardancy [22]. Naugib investigated the thermal stability and fire resistance characteristics of the recycled polyesters
encapsulated with Mg(OH) 2 . In this work, the recycled PET polyester is combined
with the synthesized Mg(OH) 2 nanocomposites through in situ polymerization technique and tested for their flame resistance properties. The results concluded that this
recycled polyesters possess great fire resisting capacity due to its prolonged time for
ignition, mass loss rate and smoke rate [21].
7.4 Sound Absorption Properties
The less specific gravity and feasibility are the two main factors contributing to the
utilization of the textile fibers for effective sound absorption properties. In common, the materials which absorb sound are majorly categorized into three types
such as porous, resonator and panel. Lee and Joo have investigated about the sound
absorption characteristics of the recycled polyester fibers. They determined the interrelationship between the properties of the fiber and sound absorption coefficient. In
this experimental work, the sound absorption capacity of the recycled polyesters is
compared with the conventional woven materials such as rock wool and glass wool.
[23]. Patnaik et al. have investigated the thermal properties of the recycled polyester
fibers and wool fibers. Various proportions of the woolen and recycled polyester
fibers are examined for the properties such as fire resistance, sound insulation, thermal insulation, and moisture retardancy. The recycled polyesters combined with the
woolen fibers showed an effective sound absorption capacity of about 70% in the
frequency range of 50–5700 Hz [24]. The recycled polyesters are preferred more
than the conventional virgin fibers due to some of the factors such as less expense,
easy handling and outstanding properties [23].
P. Senthil Kumar and G. Janet Joshiba
7.3 Thermal Properties
The thermal properties and fire retardancy properties of the recycled polyesters encapsulated with magnesium hydroxide nanocomposites is investigated by Naugib. The
thermal properties are generally studies using thermal gravimetric analysis. The
results concluded that the nanocomposites enclosed recycled polyesters showed great
thermal properties because of the dehydration of Mg(OH) 2 and inhibition of CaO
layers [21]. The PET polymers are generally flammable materials and they do not
possess great fire retardancy characteristics. The fire retardancy characteristics of the
PET polymer fibers are enhanced by combining it with synthetic halogen composed
fire retardants [21]. Generally, the polyesters are prone to hydrolytic degradation
which affects the fire resistance properties of the fibers. To combat these defects the
processing of recycled polyesters are performed using the polycondensation method.
Delva et al. have utilized the Brominated polystyrenics combined with the recycled
polybutylene terephthalate for enhancing its fire reatardancy [22]. Naugib investigated the thermal stability and fire resistance characteristics of the recycled polyesters
encapsulated with Mg(OH) 2 . In this work, the recycled PET polyester is combined
with the synthesized Mg(OH) 2 nanocomposites through in situ polymerization technique and tested for their flame resistance properties. The results concluded that this
recycled polyesters possess great fire resisting capacity due to its prolonged time for
ignition, mass loss rate and smoke rate [21].
7.4 Sound Absorption Properties
The less specific gravity and feasibility are the two main factors contributing to the
utilization of the textile fibers for effective sound absorption properties. In common, the materials which absorb sound are majorly categorized into three types
such as porous, resonator and panel. Lee and Joo have investigated about the sound
absorption characteristics of the recycled polyester fibers. They determined the interrelationship between the properties of the fiber and sound absorption coefficient. In
this experimental work, the sound absorption capacity of the recycled polyesters is
compared with the conventional woven materials such as rock wool and glass wool.
[23]. Patnaik et al. have investigated the thermal properties of the recycled polyester
fibers and wool fibers. Various proportions of the woolen and recycled polyester
fibers are examined for the properties such as fire resistance, sound insulation, thermal insulation, and moisture retardancy. The recycled polyesters combined with the
woolen fibers showed an effective sound absorption capacity of about 70% in the
frequency range of 50–5700 Hz [24]. The recycled polyesters are preferred more
than the conventional virgin fibers due to some of the factors such as less expense,
easy handling and outstanding properties [23].