Analysis of weathering of a thermoplastic polyester elastomer II. Factors affecting weathering of a polyether–polyester elastomer

Nagai, Yasutaka; Ogawa, Takahiro; Nishimoto, Yuko; Ohishi, Fujio

doi:10.1016/s0141-3910(99)00007-5

Cited by 46 publications

(25 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[26] First, assisted by the anion [NTf 2 ] À , 1 generates the alkyl radical ao nt he b-C atom linkingt ot he ether bond with UV light irradiation. It has been reported that the ether parts in the polymer are attacked selectively and form radicals during photodegradation.…”

Section: Mechanism Of the Photochemical Degradationmentioning

confidence: 99%

“…It has been reported that the ether parts in the polymer are attacked selectively and form radicals during photodegradation. [26] First, assisted by the anion [NTf 2 ] À , 1 generates the alkyl radical ao nt he b-C atom linkingt ot he ether bond with UV light irradiation. Then, free radicala reacts with atmospherico xygen to form the peroxy radicalb .R adical bs ubsequently abstracts protons from H 2 O to generate hydroperoxide da nd hydroxyl radical c,w hich react furtherw ith 1 to produce H 2 Oa nd radical a.…”

Section: Mechanism Of the Photochemical Degradationmentioning

confidence: 99%

See 1 more Smart Citation

Metal‐Free Photochemical Degradation of Lignin‐Derived Aryl Ethers and Lignin by Autologous Radicals through Ionic Liquid Induction

et al. 2019

View full text Add to dashboard Cite

show abstract

Section: Mechanism Of the Photochemical Degradationmentioning

confidence: 99%

Section: Mechanism Of the Photochemical Degradationmentioning

confidence: 99%

Metal‐Free Photochemical Degradation of Lignin‐Derived Aryl Ethers and Lignin by Autologous Radicals through Ionic Liquid Induction

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Thermoplastic polyester elastomer (TPEE), a kind of thermoplastic elastomer, is widely used in automobile, electric and electronic applications because of its excellent properties of good elasticity, superior oil and chemical resistance, as well as excellent low temperature impact strength . However, to the best of our knowledge, TPEE/graphene nanocomposites have scarcely been reported.…”

Section: Introductionmentioning

confidence: 99%

Functionalized graphene/thermoplastic polyester elastomer nanocomposites by reactive extrusion‐based masterbatch: preparation and properties reinforcement

Qian

et al. 2014

Polymers for Advanced Techs

View full text Add to dashboard Cite

A reactive extrusion process was developed to fabricate polymer/graphene nanocomposites with good dispersion of graphene sheets in the polymer matrix. The functionalized graphene nanosheet (f-GNS) activated by diphenylmethane diisocyanate was incorporated in thermoplastic polyester elastomer (TPEE) by reactive extrusion process to produce the TPEE/f-GNS masterbatch. And then, the TPEE/f-GNS nanocomposites in different ratios were prepared by masterbatchbased melt blending. The structure and morphology of functionalized graphene were characterized by Fourier transform infrared, X-ray photoelectron spectroscopy, X-ray diffraction and transmission electron microscopy (TEM). The incorporation of f-GNS significantly improved the mechanical, thermal and crystallization properties of TPEE. With the incorporation of only 0.1 wt% f-GNS, the tensile strength and elongation at break of nanocomposites were increased by 47.6% and 30.8%, respectively, compared with those of pristine TPEE. Moreover, the degradation temperature for 10 wt% mass loss, storage modulus at À70°C and crystallization peak temperature (T cp ) of TPEE nanocomposites were consistently improved by 17°C, 7.5% and 36°C. The remarkable reinforcements in mechanical and thermal properties were attributed to the homogeneous dispersion and strong interfacial adhesion of f-GNS in the TPEE matrix. The functionalization of graphene was beneficial to the improvement of mechanical properties because of the relatively well dispersion of graphene sheets in TPEE matrix, as suggested in the TEM images. This simple and effective approach consisting of chemical functionalization of graphene, reactive extrusion and masterbatch-based melt blending process is believed to offer possibilities for broadening the graphene applications in the field of polymer processing.

show abstract

“…When exposed to UV radiation PE and PP films lose their mechanical integrity and tensile strength, which is accompanied by a decrease in their average molecular weight (Singh and Sharma 2008). UV absorption in PS has been found to occur at the benzene ring, causing loss of mechanical properties, chain scission, cross-linking reactions and is a precursor to oxidative degradation (Nagai et al 1999). Nagai et al (2005b) analyzed the photo-degradation of a polyether-polyester elastomer under laboratory conditions and found the degradation mechanism upon UV exposure was a selective degradation of the ether parts of soft segments in the polymer matrix, and resulted in the formation of ester, aldehyde, formate, and propyl end groups.…”

Section: Photo-degradationmentioning

confidence: 99%

Occurrence, Degradation, and Effect of Polymer-Based Materials in the Environment

Lambert

Sinclair

Boxall

2013

Reviews of Environmental Contamination and Toxicology

158

151

View full text Add to dashboard Cite

There is now a plethora of polymer-based materials (PBMs) on the market, because of the increasing demand for cheaper consumable goods, and light-weight industrial materials. Each PBM constitutes a mixture of their representative polymer/sand their various chemical additives. The major polymer types are polyethylene, polypropylene,and polyvinyl chloride, with natural rubber and biodegradable polymers becoming increasingly more important. The most important additives are those that are biologically active, because to be effective such chemicals often have properties that make them resistant to photo-degradation and biodegradation. During their lifecycle,PBMs can be released into the environment form a variety of sources. The principal introduction routes being general littering, dumping of unwanted waste materials,migration from landfills and emission during refuse collection. Once in the environment,PBMs are primarily broken down by photo-degradation processes, but due to the complex chemical makeup of PBMs, receiving environments are potentially exposed to a mixture of macro-, meso-, and micro-size polymer fragments, leached additives, and subsequent degradation products. In environments where sunlight is absent (i.e., soils and the deep sea) degradation for most PBMs is minimal .The majority of literature to date that has addressed the environmental contamination or disposition of PBMs has focused on the marine environment. This is because the oceans are identified as the major sink for macro PBMs, where they are known to present a hazard to wildlife via entanglement and ingestion. The published literature has established the occurrence of microplastics in marine environment and beach sediments, but is inadequate as regards contamination of soils and freshwater sediments. The uptake of microplastics for a limited range of aquatic organisms has also been established, but there is a lack of information regarding soil organisms, and the long-term effects of microplastic uptake are also less well understood.There is currently a need to establish appropriate degradation test strategies consistent with realistic environmental conditions, because the complexity of environmental systems is lost when only one process (e.g., hydrolysis) is assessed in isolation. Enhanced methodologies are also needed to evaluate the impact of PBMs to soil and freshwater environments.

show abstract

Analysis of weathering of a thermoplastic polyester elastomer II. Factors affecting weathering of a polyether–polyester elastomer

Cited by 46 publications

References 7 publications

Metal‐Free Photochemical Degradation of Lignin‐Derived Aryl Ethers and Lignin by Autologous Radicals through Ionic Liquid Induction

Metal‐Free Photochemical Degradation of Lignin‐Derived Aryl Ethers and Lignin by Autologous Radicals through Ionic Liquid Induction

Functionalized graphene/thermoplastic polyester elastomer nanocomposites by reactive extrusion‐based masterbatch: preparation and properties reinforcement

Occurrence, Degradation, and Effect of Polymer-Based Materials in the Environment

Contact Info

Product

Resources

About