Morphology of reactive PP/PS blends with hyperbranched polymers

Abstract:Polymer-based multilayer packaging materials are commonly used in order to combine the respective performance of different polymers. By this approach, the tailored functionality of packaging concepts is created to sufficiently protect sensitive food products and thus obtain extended shelf life. However, because of their poor recyclability, most multilayers are usually incinerated or landfilled, counteracting the efforts towards a circular economy and crude oil independency. This review depicts the current state of the European multilayer packaging market and sketches the current end-of-life situation of postconsumer multilayer packaging waste in Germany. In the main section, a general overview of the state of research about material recycling of different multilayer packaging systems is provided. It is divided into two subsections, whereby one describes methods to achieve a separation of the different components, either by delamination or the selective dissolution-reprecipitation technique, and the other describes methods to achieve recycling by compatibilization of nonmiscible polymer types. While compatibilization methods and the technique of dissolution-reprecipitation are already extensively studied, the delamination of packaging has not been investigated systematically. All the presented options are able to recycle multilayer packaging, but also have drawbacks like a limited scope or a high expenditure of energy.

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“…Also, the compatibilization of packaging plastics other than polyolefins, PET, and PA is described in the literature [111][112][113][114][115].…”

Section: Othersmentioning

confidence: 99%

Recycling of Polymer-Based Multilayer Packaging: A Review

2017

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“…The dispersion of rubber in PP matrix is very good on the whole, but some big dispersed particles appear when SEEPS is >5%, which may result from the aggregation of EPR particle and/or EP domain. Generally speaking, PP and PS is immiscible, but the interfaces between PP matrix and PS domain of SEEPS are hardly observed from Figure . It may mean that PP matrix and PS domain has a better compatibility, because PS segment and EP segment which has a pretty good interfacial strength with PP are held together by covalent bonds.…”

Section: Resultsmentioning

confidence: 96%

Fabrication of polypropylene blends with excellent low‐temperature toughness and balanced toughness‐rigidity by a combination of EPR and SEEPS

Jia

Shangguan

Xiong

et al. 2017

J of Applied Polymer Sci

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To overcome serious rigidity depression of rubber‐toughened plastics and fabricate a rigidity‐toughness balanced thermoplastic, a combination of styrene‐[ethylene‐(ethylene‐propylene)]‐styrene block copolymer (SEEPS) and ethylene‐propylene rubber (EPR) was used to toughen polypropylene. The dynamic mechanical properties, crystallization and melting behavior, and mechanical properties of polypropylene (PP)/EPR/SEEPS blends were studied in detail. The results show that the combination of SEEPS and EPR can achieve the tremendous improvement of low‐temperature toughness without significant strength and rigidity loss. Dynamic mechanical properties and phase morphology results demonstrate that there is a good interfacial strength and increased loss of compound rubber phase comprised of EPR component and EP domain of SEEPS. Compared with PP/EPR binary blends, although neither glass transition temperature (Tg) of the rubber phase nor Tg of PP matrix in PP/EPR/SEEPS blends decreases, the brittle‐tough transition temperature (Tbd) of PP/EPR/SEEPS blends decreases, indicating that the increased interfacial interaction between PP matrix and compound rubber phase is also an effective approach to decrease Tbd of the blends so as to improve low‐temperature toughness. The balance between rigidity and toughness of PP/EPR/SEEPS blends is ascribed to the synergistic effect of EPR and SEEPS on toughening PP. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45714.

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“…It can be seen that for PP/(2%)HBP blend, the time to reach the maximum degree of crystallization increases, as the crystallization temperature increases. The isothermal crystallization kinetics can be analyzed using Avrami equation [3]. Assuming the relative degree of crystallinity increases with increasing crystallization time, the Avrami equation can be rewritten in a double logarithm form:…”

Section: Resultsmentioning

confidence: 99%

Isothermal Crystallization Kinetics of Polypropylene and Hyperbranched Polyester Blends

Fan

Duan

Guo

et al. 2011

AMR

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The isothermal crystallization kinetics of PP with different contents of AB2 hyperbranched polyester(HBP) added has been investigated. The results show that HBP acts as a nucleating agent for PP, and the hyperbranched polyester can decrease the half crystallization time (t1/2) and increase the crystallization rate of PP greatly. The Avrami exponents of PP and nucleated PP are all close to 2.5. Hoffman theory was adopted to calculate the interfacial free energy per unit area perpendicular to PP chains σe of PP and PP/HBP blends.

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Morphology of reactive PP/PS blends with hyperbranched polymers

Cited by 6 publications

References 0 publications

Recycling of Polymer-Based Multilayer Packaging: A Review

Recycling of Polymer-Based Multilayer Packaging: A Review

Fabrication of polypropylene blends with excellent low‐temperature toughness and balanced toughness‐rigidity by a combination of EPR and SEEPS

Isothermal Crystallization Kinetics of Polypropylene and Hyperbranched Polyester Blends

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