4 results listed
Poly (ethylene terephthalate) (PET) and poly(butylene terephthalate) (PBT) are the members of the most
important commercial thermoplastic polyesters. PBT has the advantages of rapid crystallization rate and good
mouldability properties compared with the PET, while heat-deflection temperature and rigidity of PET are superior to
those of PBT. The blending of PET and PBT offers the potential of improvements property between PET and PBT to
obtain a new material with comprehensive properties [1]. Considerable attention has been given to the graphene/polymer
nanocomposites, which greatly improve the electrical and thermal conductivity, mechanical, thermal stability, and flame
retardant properties of polymers [2]. Similar to the other nanofillers, dispersion and interfacial interactions are the two
main parameters of graphene/polymer nanocomposites. Because these parameters directly influence the properties of
the prepared nanocomposites [3].
International Symposium on Light Alloys and Composite Materials
UHAKS
Mehmet Özdemir
Seda HAZER
Ayse AYTAC
Abstract
The interest in biodegradable polymers is increasing day by day owing to the environmental problems
caused by petroleum-based plastics. Among the biodegradable polymers, poly (lactic acid) (PLA) has attracted
increasing interest by industry. Due to its good mechanical properties, gas permeability, biocompatibility, and
transparency, PLA takes the place of the other synthetic polymers in a wide variety of industrial applications.
Besides these advantages, there is a disadvantage such as low toughness and easy flammability limit the use of
PLA in different areas. The toughness of PLA can be improved with other polymers by the blending. Polycarbonate
(PC) which has thermal stability, toughness, easy processability and high impact strength, has been widely used
as an engineering plastic [1]. Enormous mechanical properties such as high toughness demonstrated by the PLA
and the PC's good features can be combined with the PLA/PC blend. However, the mechanical properties of the
resulting blend are lower than expected value due to the incompatibility [3,4,5]. Synthetic fiber reinforcement is
a commonly used method to improve mechanical properties of the polymers.
International Symposium on Light Alloys and Composite Materials
UHAKS
Seda HAZER
Meral COBAN
Ayse AYTAC
Polylactide (PLA) is a biodegradable polyester obtained from the synthesis of lactic acid, which can be produced from
renewable resources such as sugarcane or corn [1]. PLA is environmentally friendly biopolymer due to its
biocompatibility and biodegradability [2]. PLA has high modulus and tensile strength value. However, it also possesses
some disadvantages, for example, films of PLA is very brittle and poor heat stability [3]. Therefore, is limited its some
industrial applications. In the recent years, the great attention has been devoted to PLA modification leading to the
improvement of thermal and mechanical properties. In the literature, various studies have been realized by using different
methods in order to improve the properties of the PLA. Many technologies, such as annealing, adding nucleating agents,
forming composites with fibers or nanoparticles, chain extending and introducing crosslinking structures were used to
enhancing the heat stability or mechanical properties of PLA materials [1,3]. Formation of polymer blends is one of the
using methods to improve the polymer properties.
International Symposium on Light Alloys and Composite Materials
UHAKS
Yesim TOP
Ayse AYTAC
Abstract
Recently, there has been an increasing interest in biodegradable packaging materials because of the increasing
of the environmental damage of plastic waste. Among the various natural sources, proteins have been used as a packaging
material because of their abundance and renewability [1]. Casein is a commercially available protein obtained from cow’s
milk. Casein can be used several application areas due to its good film-forming properties, high O2, CO2 barrier and
transparency. On the other hand, there are some drawbacks of casein-based films. Such as high water permeability, poor
mechanical properties and stiffness compared to the synthetic polymer films. To improve these properties, proteins can
be blended with other polymers and plasticizers [2,3]. Plasticizers such as glycerol increased the free volume and
flexibility of casein. Poly (vinyl alcohol) (PVA) is the water-soluble synthetic polymer and it is convenient to
biodegradation with enzymes and microorganisms. PVA can be blended with natural polymers and proteins. It provides
good mechanical properties, chemical resistance, biodegradability and barrier properties to O2 and aroma [4,5].
International Symposium on Light Alloys and Composite Materials
UHAKS
Bedriye Ucpinar
Ayse AYTAC