Long‐chain branching of polyethylene terephthalate: Rheological/thermal properties of polyethylene terephthalate/carbon nanotube nanocomposite

Dolatshah, Saeed; Ahmadi, Shervin; Ershad‐Langroudi, Amir; Alavi, Aida

doi:10.1002/pen.26012

Cited by 3 publications

(2 citation statements)

References 89 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The complex viscosity measured with the rotational rheometer as a function of the frequency superimposes to the viscosity curve measured as a function of the shear rate in the capillary viscometer. This indicates that the two polyesters follow the Cox-Merz rule [38,39]. In Figure 2 it is also possible to notice that the MB-L sample seems to show, at low frequency values, a Newtonian plateau, while, the branched sample shows a curve still increasing.…”

Section: Resultsmentioning

confidence: 71%

See 1 more Smart Citation

Influence of Branching on the Rheology, Filmability and Mechanical and Optical Properties of a Biodegradable and Compostable Co-Polyester

Citarrella,

Scaffaro,

Rallis

et al. 2023

J Polym Environ

View full text Add to dashboard Cite

Over the last years, bio-based and biodegradable alternatives have gained considerable attention both of academic and of packaging industrial communities, driven by recent legislation and increasing awareness concerning environmental issues related to traditional plastic. However, it is often observed that packaging products made from bioplastics do not exhibit comparable performance to those produced using common non-biodegradable ones. The presence of long chain branching improves the processing behavior under elongational flow and, then, the filmability of low viscosity polymers such as polyesters. In this work it has been demonstrated that the presence of long chain branching in a bio-co-polyester, induced by the use of pentaerythritol in the synthesis a of poly(butylene adipate-co-butylene terephthalate), is able to dramatically change the rheological behavior of the linear chain polyester improving its filmability. The addition of branching lead to an increase of the elastic modulus and the tensile strength in branched polyester films if compared to the linear ones, while the elongation at break decreased. This is due to the answer of the branched polyester to the non-isothermal elongational flow that allows a better orientation of the macromolecules of the branched polyester. The film obtained with the branched polyester showed a 2 decrease in clarity and a slight increase in haze if compared to linear one due to differences in the morphology of the two samples.

show abstract

Section: Resultsmentioning

confidence: 71%

“…In particular, this behavior can be observed in the presence of long chain branching as short branches do not impart this rheological behavior to linear polymers [40]. This behavior was expected since the presence of long chain branches increases the elongational viscosity and decreases the deformability of the melt [37][38][39].…”

Section: Resultsmentioning

confidence: 99%

Influence of Branching on the Rheology, Filmability and Mechanical and Optical Properties of a Biodegradable and Compostable Co-Polyester

Citarrella,

Scaffaro,

Rallis

et al. 2023

J Polym Environ

View full text Add to dashboard Cite

show abstract

Mechanical degradation of poly(ethylene terephthalate) and its structural modification by chain extender

Saabome

Lee

Hong

et al. 2023

Korea-Aust. Rheol. J.

View full text Add to dashboard Cite

Rheology of Recycled PET

Cusano

Campagnolo²,

Aurilia³

et al. 2023

Materials

View full text Add to dashboard Cite

Polyethylene terephthalate (PET) is a thermoplastic material that is widely used in many application fields, such as packaging, construction and household products. Due to the relevant contribution of PET to global yearly solid waste, the recycling of such material has become an important issue. Disposed PET does not maintain the mechanical properties of virgin material, as exposure to water and other substances can cause multiple chain scissions, with subsequent degradation of the viscoelastic properties. For this reason, chain extension is needed to improve the final properties of the recycled product. Chain extension is generally performed through reactive extrusion. As the latter involves structural modification and flow of PET molecules, rheology is a relevant asset for understanding the process and tailoring the mechanical properties of the final products. This paper briefly reviews relevant rheological studies associated with the recycling of polyethylene terephthalate through the reactive extrusion process.

show abstract

Long‐chain branching of polyethylene terephthalate: Rheological/thermal properties of polyethylene terephthalate/carbon nanotube nanocomposite

Cited by 3 publications

References 89 publications

Influence of Branching on the Rheology, Filmability and Mechanical and Optical Properties of a Biodegradable and Compostable Co-Polyester

Influence of Branching on the Rheology, Filmability and Mechanical and Optical Properties of a Biodegradable and Compostable Co-Polyester

Mechanical degradation of poly(ethylene terephthalate) and its structural modification by chain extender

Rheology of Recycled PET

Contact Info

Product

Resources

About