Compatibilization of iPP/HDPE Blends with PE-g-iPP Graft Copolymers

Kļimoviča, Kristīne; Pan, Sanshui; Lin, Ting Wei; Peng, Xiayu; Ellison, Christopher J.; LaPointe, Anne M.; Bates, Frank S.; Coates, Geoffrey W.

doi:10.1021/acsmacrolett.0c00339

Cited by 68 publications

(83 citation statements)

References 22 publications

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“…119 Coates, Bates, LaPointe, and co-workers used differing bespoke PE/iPP multiblock copolymer topologies to lower compatibilizer levels while still dramatically toughening otherwise brittle blends. 120,121 Analogous work has been carried out by Loṕez-Barroń's group at ExxonMobil with similar results. 122,123 While these materials perform well, there are concerns that these complex blends will further complicate recycling efforts.…”

Section: ■ Sustainable Polymerssupporting

confidence: 61%

100th Anniversary of Macromolecular Science Viewpoint: Redefining Sustainable Polymers

et al. 2020

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Although Staudinger realized makromoleküles had enormous potential, he likely did not anticipate the consequences of their universal adoption. With 6.3 billion metric tons of plastic waste now contaminating our land, water, and air, we are facing an environmental and public health crisis. Synthetic polymer chemists can help create a more sustainable future, but are we on the right path to do so? Herein, a comprehensive literature survey reveals that there has been an increased focus on “sustainable polymers” in recent years, but most papers focus on biomass-derived feedstocks. In contrast, there is less focus on polymer end-of-life fates. Moving forward, we suggest an increased emphasis on chemical recycling, which sees value in plastic waste and promotes a closed-loop plastic economy. To help keep us on the path to sustainability, the synthetic polymer community should routinely seek the systems perspective offered by life cycle assessment.

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Section: ■ Sustainable Polymerssupporting

confidence: 61%

100th Anniversary of Macromolecular Science Viewpoint: Redefining Sustainable Polymers

et al. 2020

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“…[ 92,151,152 ] More recently, this research group has presented polyethylene grafted with isotactic polypropylene copolymers (PE‐ g ‐iPP) as blending agents for PP and PE with similar compatibilising effects as multi‐block copolymers. [ 153 ] The grafted compatibilisers are formed by copolymerising macromonomers in the presence of a hafnium pyridylamido catalyst rather than by living polymerisation. These new copolymer compatibilisers Thus, providing an economically favourable method to compatibilised MPO wastes.…”

Section: Mechanical Recycling Of Polyolefinsmentioning

confidence: 99%

“…These new copolymer compatibilisers Thus, providing an economically favourable method to compatibilised MPO wastes. [ 153 ] Successful compatibilization of polyolefins is of great interest to the recycling industry. The qualities of one polyolefin can be used to enhance that of another.…”

Section: Mechanical Recycling Of Polyolefinsmentioning

confidence: 99%

Mechanical Recycling of Packaging Plastics: A Review

Schyns

Shaver

2020

Macromol. Rapid Commun.

877

692

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The current global plastics economy is highly linear, with the exceptional performance and low carbon footprint of polymeric materials at odds with dramatic increases in plastic waste. Transitioning to a circular economy that retains plastic in its highest value condition is essential to reduce environmental impacts, promoting reduction, reuse, and recycling. Mechanical recycling is an essential tool in an environmentally and economically sustainable economy of plastics, but current mechanical recycling processes are limited by cost, degradation of mechanical properties, and inconsistent quality products. This review covers the current methods and challenges for the mechanical recycling of the five main packaging plastics: poly(ethylene terephthalate), polyethylene, polypropylene, polystyrene, and poly(vinyl chloride) through the lens of a circular economy. Their reprocessing induced degradation mechanisms are introduced and strategies to improve their recycling are discussed. Additionally, this review briefly examines approaches to improve polymer blending in mixed plastic waste streams and applications of lower quality recyclate.

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“… 28 More recent studies investigating MBCP compatibilizers with four or more blocks—enabled by synthetic advancements—have revealed that MBCPs actually outperform traditional diblocks. 18 , 35 − 37 These and other recent advances are discussed in depth in later sections of this perspective.…”

Section: Introductionmentioning

confidence: 97%

Linear, Graft, and Beyond: Multiblock Copolymers as Next-Generation Compatibilizers

Self

Zervoudakis

Peng

et al. 2022

JACS Au

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Properly addressing the global issue of unsustainable plastic waste generation and accumulation will require a confluence of technological breakthroughs on various fronts. Mechanical recycling of plastic waste into polymer blends is one method expected to contribute to a solution. Due to phase separation of individual components, mechanical recycling of mixed polymer waste streams generally results in an unsuitable material with substantially reduced performance. However, when an appropriately designed compatibilizer is used, the recycled blend can have competitive properties to virgin materials. In its current state, polymer blend compatibilization is usually not cost-effective compared to traditional waste management, but further technical development and optimization will be essential for driving future cost competitiveness. Historically, effective compatibilizers have been diblock copolymers or in situ generated graft copolymers, but recent progress shows there is great potential for multiblock copolymer compatibilizers. In this perspective, we lay out recent advances in synthesis and understanding for two types of multiblock copolymers currently being developed as blend compatibilizers: linear and graft. Importantly, studies of appropriately designed copolymers have shown them to efficiently compatibilize model binary blends at concentrations as low as ∼0.2 wt %. These investigations pave the way for studies on more complex (ternary or higher) mixed waste streams that will require novel compatibilizer architectures. Given the progress outlined here, we believe that multiblock copolymers offer a practical and promising solution to help close the loop on plastic waste. While a complete discussion of the implementation of this technology would entail infrastructural, policy, and social developments, they are outside the scope of this perspective which instead focuses on material design considerations and the technical advancements of block copolymer compatibilizers.

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Compatibilization of iPP/HDPE Blends with PE-g-iPP Graft Copolymers

Cited by 68 publications

References 22 publications

100th Anniversary of Macromolecular Science Viewpoint: Redefining Sustainable Polymers

100th Anniversary of Macromolecular Science Viewpoint: Redefining Sustainable Polymers

Mechanical Recycling of Packaging Plastics: A Review

Linear, Graft, and Beyond: Multiblock Copolymers as Next-Generation Compatibilizers

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