Degradation Studies of Polyolefins

Austin, Richard G.

doi:10.1201/9781351071321-9

Cited by 2 publications

(7 citation statements)

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“…Ayrıca polimerik matriksler ile bir araya getirilen inorganik katkılar bitmiş üründe rengin koyulaşmasına sebep olmakta ve polimer yapısında küçük molekül ağırlıklı bileşikler oluşabildiği için istenmeyen kokulara da sebep olmaktadır. Bunun yanında, katkılı plastiklerin degredasyonu sebebiyle göreceli yüksek sıcaklıklarda farklı bozunma ürünleri oluşmakta bu oluşan ürünlerde istenmeyen plastik bazlı kokulara sebebiyet vermektedir (Austin, 1990, Mottarm, 1998, Sajilata vd. 2007, Baigrie, 2003.…”

Section: şEkil 1 Polipropilenin Polimerik Formlarıunclassified

“…Plastik malzemelerden adsorbanlara tutunan koku moleküllerinin; 2-metil-pentan, 2,2,3,3 tetrametil butan, 4-metil-oktan, etil alkol, 4,7-dimethyl undekan, 5,7dimetil undekan, 2,3,6,7-tetrametil oktan bileşikleri olduğu görülmüştür. Bu bileşikler uçucu ve kokulu bileşikler olarak literatür ile de eşleştirilmiştir (Ezquerro vd.,2002;Austin, 1990;Mottarm, 1998).…”

Section: Polipropilen Malzemelerden Yayılan Koku Bileşiklerinin Gc-ms Ile Analizleriunclassified

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Bulaşık Makinelerinde Oluşan Plastik ve Gıda Kaynaklı Kokuların Head Space GC-MS ile Tespiti

Doğan¹

2021

European Journal of Science and Technology

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Section: şEkil 1 Polipropilenin Polimerik Formlarıunclassified

Section: Polipropilen Malzemelerden Yayılan Koku Bileşiklerinin Gc-ms Ile Analizleriunclassified

Bulaşık Makinelerinde Oluşan Plastik ve Gıda Kaynaklı Kokuların Head Space GC-MS ile Tespiti

Doğan¹

2021

European Journal of Science and Technology

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“…3 PE and other polyolefins are resistant to most chemicals and environmental conditions; they do not degrade hydrolytically or by enzymes. 4 The durability of PE is an attractive feature and has driven its success not only in lightweight materials and packaging but also in biomedical applications, for example, for long-term implants. 5 However, if littered in nature, PE plastic parts do not degrade over a period of decades to centuries.…”

Section: Introductionmentioning

confidence: 99%

“…5 However, if littered in nature, PE plastic parts do not degrade over a period of decades to centuries. 4…”

Section: Introductionmentioning

confidence: 99%

“…With the invention of Karl Ziegler in the past century, perfectly linear PE was accessible that changed our everyday life drastically . PE and other polyolefins are resistant to most chemicals and environmental conditions; they do not degrade hydrolytically or by enzymes . The durability of PE is an attractive feature and has driven its success not only in lightweight materials and packaging but also in biomedical applications, for example, for long-term implants .…”

Section: Introductionmentioning

confidence: 99%

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Aliphatic Long-Chain Polypyrophosphates as Biodegradable Polyethylene Mimics

2019

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Biodegradable polyethylene mimics have been synthesized by the introduction of pyrophosphate groups into the polymer backbone, allowing not only hydrolysis of the backbone but also further degradation by microorganisms. Because of cost, low weight, and good mechanical properties, the use of polyolefins has increased significantly in the past decades and has created many challenges in terms of disposal and their environmental impact. The durability and resistance to degradation make polyethylene difficult or impossible for nature to assimilate, thus making the degradability of polyolefins an essential topic of research. The biodegradable polypyrophosphate was prepared via acyclic diene metathesis polymerization of a diene monomer. The monomer is accessible via a three-step synthesis, in which the pyrophosphate was formed in the last step by DCC coupling of two phosphoric acid derivatives. This is the first report of a pyrophosphate group localized in an organic polymer backbone. The polypyrophosphate was characterized in detail by NMR spectroscopy, size exclusion chromatography, FTIR spectroscopy, differential scanning calorimetry, and thermogravimetry. X-ray diffraction was used to compare the crystallization structure in comparison to analogous polyphosphates showing poly(ethylene)-like structures. In spite of their hydrophobicity and water insolubility, the pyrophosphate groups exhibited fast hydrolysis, resulting in polymer degradation when films were immersed in water. Additionally, the hydrolyzed fragments were further biodegraded by microorganisms, rendering these PE mimics potential candidates for fast release of hydrophobic cargo, for example, in drug delivery applications.

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Degradation Studies of Polyolefins

Cited by 2 publications

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Bulaşık Makinelerinde Oluşan Plastik ve Gıda Kaynaklı Kokuların Head Space GC-MS ile Tespiti

Bulaşık Makinelerinde Oluşan Plastik ve Gıda Kaynaklı Kokuların Head Space GC-MS ile Tespiti

Aliphatic Long-Chain Polypyrophosphates as Biodegradable Polyethylene Mimics

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