Properties of Recycled Polyester
11
7.2 Mechanical Properties
The mechanical properties of the polyesters are estimated in the form of tensile
strength, flexibility, randomness and defects present in the yarn and fabric [16]. In
the study conducted by Jo et al. the mechanical properties of the recycled polyesters
are studied and their impact in the polymer concretes has been studied. Due to the
effective mechanical properties of the recycled polyesters, it is utilized in the construction sectors to enhance the strength of the concretes. The studies concluded that
the recycled polyesters possess a compressive strength of about 73.7 MPa, Tensile
strength of about 7.85 MPa, Flexural strength of about 22.4 MPa and elasticity of
about 27.9 MPa at a time period of 7 days. A strong interrelationship is seen in
between the compressive strength and other physical properties of the polyesters
such as elasticity, tensile strength, and flexibility. The application of the recycled
polyesters on the concretes have some major advantages such as conservation of
energy resources, minimum expenditure, reduction of solid waste [17]. Saeed et al.
have investigated the properties of recycled polyester fibers. In this research work, the
virgin hyperbranched polyester is fabricated and combined with recycled polyester
fibers, consecutively; both the virgin and recycled polyesters are subjected to spinning
and thermal drawing process. The characterization results concluded that the mechanical properties of the fibers are seemed to be higher than the virgin polyesters. The
enhanced mechanical properties of the recycled polyesters are due to the distributed
arrangement of the fibers along the axis [16]. Jo et al. have studied the mechanical
properties of polymer concretes made out of recycled polyester materials. In this
study, the acid resistance, stress resistance and mechanical strength of the concrete
prepared from the recycled polyesters are studied. The mechanical properties of the
recycled polyesters are seemed to be effective than the normal concrete material [18].
Lin et al. have implemented the recycled polyethylene terephthalate waste as short
fibres as hardening cementitious composites. The results seemed to be convincing
and it declared that this recycled PET materials can be potentially used in the construction industry and it is also seemed to be economically feasible and eco-friendly
technique [19]. The Post- consumer PET materials exhibit lower intrinsic velocity
after thermal and mechanical reprocessing system because of the impacts created
by hydrolytic and thermal degradation. In addition, the hydrolytic degradation lowers the tensile and mechanical properties. To combat this issue, the PET materials
are extruded with some chain elongation such as bis-iminocarbonate, diphenyl carbonate, bis-2-oxazolines, diphenyl oxalate, pyromellitic dianhydride (PMDA) and
diisocyanate [20]. Yuksekkaya et al. have investigated the comparative analysis of the
mechanical properties of the virgin and recycled polyesters. The results concluded
that the recycled polyester fibres exerted enhanced mechanical properties when it
is compared with the virgin polyesters. Also, this study clearly Inferred that the
recycled polyester fibres have higher tensile strength and it is highly suited in the
manufacturing of sweatshirts, T-shirts, etc., [16].
11
7.2 Mechanical Properties
The mechanical properties of the polyesters are estimated in the form of tensile
strength, flexibility, randomness and defects present in the yarn and fabric [16]. In
the study conducted by Jo et al. the mechanical properties of the recycled polyesters
are studied and their impact in the polymer concretes has been studied. Due to the
effective mechanical properties of the recycled polyesters, it is utilized in the construction sectors to enhance the strength of the concretes. The studies concluded that
the recycled polyesters possess a compressive strength of about 73.7 MPa, Tensile
strength of about 7.85 MPa, Flexural strength of about 22.4 MPa and elasticity of
about 27.9 MPa at a time period of 7 days. A strong interrelationship is seen in
between the compressive strength and other physical properties of the polyesters
such as elasticity, tensile strength, and flexibility. The application of the recycled
polyesters on the concretes have some major advantages such as conservation of
energy resources, minimum expenditure, reduction of solid waste [17]. Saeed et al.
have investigated the properties of recycled polyester fibers. In this research work, the
virgin hyperbranched polyester is fabricated and combined with recycled polyester
fibers, consecutively; both the virgin and recycled polyesters are subjected to spinning
and thermal drawing process. The characterization results concluded that the mechanical properties of the fibers are seemed to be higher than the virgin polyesters. The
enhanced mechanical properties of the recycled polyesters are due to the distributed
arrangement of the fibers along the axis [16]. Jo et al. have studied the mechanical
properties of polymer concretes made out of recycled polyester materials. In this
study, the acid resistance, stress resistance and mechanical strength of the concrete
prepared from the recycled polyesters are studied. The mechanical properties of the
recycled polyesters are seemed to be effective than the normal concrete material [18].
Lin et al. have implemented the recycled polyethylene terephthalate waste as short
fibres as hardening cementitious composites. The results seemed to be convincing
and it declared that this recycled PET materials can be potentially used in the construction industry and it is also seemed to be economically feasible and eco-friendly
technique [19]. The Post- consumer PET materials exhibit lower intrinsic velocity
after thermal and mechanical reprocessing system because of the impacts created
by hydrolytic and thermal degradation. In addition, the hydrolytic degradation lowers the tensile and mechanical properties. To combat this issue, the PET materials
are extruded with some chain elongation such as bis-iminocarbonate, diphenyl carbonate, bis-2-oxazolines, diphenyl oxalate, pyromellitic dianhydride (PMDA) and
diisocyanate [20]. Yuksekkaya et al. have investigated the comparative analysis of the
mechanical properties of the virgin and recycled polyesters. The results concluded
that the recycled polyester fibres exerted enhanced mechanical properties when it
is compared with the virgin polyesters. Also, this study clearly Inferred that the
recycled polyester fibres have higher tensile strength and it is highly suited in the
manufacturing of sweatshirts, T-shirts, etc., [16].