Enhancement of pro‐degradant performance in polyethylene/starch blends as a function of distribution

Liu, Xingxun; Petinakis, Eustathios; Bateman, Stuart; Sangwan, Parveen; Ammala, Anne; Dean, Katherine; Wong-Holmes, Susan; Yuan, Qiang; Siew, Chee Kiong; Samsudin, Farid; Ahamid, Z.

doi:10.1002/app.38229

Cited by 10 publications

(11 citation statements)

References 31 publications

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“…Usually, this process can be accelerated by metal ions. Starches contain various impurities and hydroxyl functional groups . The UV photo‐oxidation degradation is a combined effect of photolysis and oxidative reactions and usually has been as a radical‐based oxidative process .…”

Section: Resultssupporting

confidence: 93%

“…Starches contain various impurities and hydroxyl functional groups . The UV photo‐oxidation degradation is a combined effect of photolysis and oxidative reactions and usually has been as a radical‐based oxidative process . The hydroxyl functional groups present in starches could combine with the bronsted acidic to form the catalytic active sites thus accelerating the degradation of HDPE.…”

Section: Resultsmentioning

confidence: 99%

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New evidences of accelerating degradation of polyethylene by starch

Liu

Xie²,

Petinakis

et al. 2013

J of Applied Polymer Sci

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An investigation into the effects of starch on both, UV photo-oxidative degradation and biodegradation, of HDPE was focused on the interface between HDPE and starch using Synchrotron-FTIR microscope (SFTIR-M) and scanning electronic microscope (SEM). Carbonyl group detection by FTIR was conducted to evaluate the effect of degradation following exposure to UV photo-oxidative degradation. The results showed that the concentration of carbonyl groups on the interface were higher, suggesting the role of starch in accelerating the UV photo-oxidative degradation of HDPE. The interface between HDPE and starch was further observed under SEM to study the morphological changes after UV photo-oxidative degradation and biodegradation. Micro-cracking was observed on the interface between starch and HDPE after UV photo-oxidative degradation. Tensile testing after UV exposure showed that the variation rate of elongation was higher for the samples containing starch. Starch, an easily biodegradable material, can also act as initial source of nutrients for micro-organisms (bacteria, fungi, and algae) in the blend materials thus enhancing their biodegradability.

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Section: Resultssupporting

confidence: 93%

Section: Resultsmentioning

confidence: 99%

New evidences of accelerating degradation of polyethylene by starch

Liu

Xie²,

Petinakis

et al. 2013

J of Applied Polymer Sci

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“…Attenuated total reflection (ATR) model is normally used to determine the short‐range structural change of starch and surface properties of starch film. Yu.et al 34 recently have used ATR to successfully detect the surface degradation of polyethylene (PE)/starch blends after ultraviolet (UV) photo‐oxidative with different time. FTIR microscopy 35, 36 is a novel method to detect new chemical group at spatial distribution, and is widely used in starch phase distribution in starch materials 37.…”

Section: Techniques Used For Studying Thermal Decomposition Of Starchmentioning

confidence: 99%

Thermal degradation and stability of starch under different processing conditions

Liu¹,

Wang²,

et al. 2012

Starch Stärke

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269

145

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The objectives of this paper are to review the thermal degradation and stability of starch and starch‐based materials, including both fundamental sciences such as detecting techniques, the effect of amylose/amylopectin content in starches and starches modifications, as well as the effect of different processing environments, such as an open or sealed system, and shearless or shear stress conditions. The decomposition temperature of starches was increased with increasing amylopectin content in an open system. In the open system, the initial water content did not affect the decomposition temperature because all water had evaporated from samples prior to reaching the decomposition temperature. Two decomposition temperatures were observed in the sealed system: the first at lower temperature represents long chain scission; and the second at higher temperature involves decomposition of glucose ring. In the sealed system, the first degradation was increased with increasing amylopectin content. There is no observable difference of the second degradation for the samples containing different amylose/amylopectin ratios. The higher the moisture content is, the lower the second decomposition temperature is detected in the sealed system. Significant shear degradation was observed in amylopectin component of starch, while high amylose starch proved less sensitive to shear stress. The achievements in this area have increased the knowledge of polymer science, in particular to understand the degradation of natural polymers.

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“…Many strategies have been tried, such as recycling the used ones and introducing prodegradant additives. Unfortunately, there still lacks a fully effective method. , Adding organic fractions will complicate the recycling of plastics and the use of prodegradants is still in dispute. From the viewpoint of sustainability, the substitution of petrochemical polymers with biobased and biodegradable alternatives is necessary. − …”

Section: Introductionmentioning

confidence: 99%

Modification of Poly(butylene 2,5-furandicarboxylate) with Lactic Acid for Biodegradable Copolyesters with Good Mechanical and Barrier Properties

Zhang

Shi

et al. 2018

Ind. Eng. Chem. Res.

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Fully biobased poly(butylene 2,5-furandicarboxylate)-co-poly(lactic acid)s (PBFLAs) of lactic acid composition from 10% to 40% are synthesized. They are subjected to molecular, thermal, diffractometric, degradable and mechanical characterizations. Thermogravimetric analysis shows that PBFLA are thermally stable at least 350 °C, much higher than PLA. After the incorporation of lactic acid units, both T m and crystallization rate decrease with respect to homopolymers. X-ray diffraction measurements indicate that no PLA crystal is present during crystallization. All samples perform better barrier properties with respect to PLA, implying potential application in packaging. These samples behave like semicrystalline plastic in the tensile tests. PBFLA copolyesters show Young's modulus, maximum tensile strength and breakage elongation higher than 1000 MPa, 38 MPa, and 230%, respectively. Such comprehensive mechanical behaviors exceed most biodegradable materials. Lastly, biodegradability could be significantly improved when more than 20% of lactic acid units are introduced into homopolymers.

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Enhancement of pro‐degradant performance in polyethylene/starch blends as a function of distribution

Cited by 10 publications

References 31 publications

New evidences of accelerating degradation of polyethylene by starch

New evidences of accelerating degradation of polyethylene by starch

Thermal degradation and stability of starch under different processing conditions

Modification of Poly(butylene 2,5-furandicarboxylate) with Lactic Acid for Biodegradable Copolyesters with Good Mechanical and Barrier Properties

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