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Effects of Pine Needle Extracts on the Degradation of LLDPE

Polyolefin suffers from degradation during processing and application. To prolong the service life, antioxidants are needed in the packing formula of polyolefin products. The usage of natural antioxidants could avoid potential health hazards aroused by synthetic ones. Pine needles have long lives an...

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Autores principales: Li, Xiangyao, Zhang, Jie, Liu, Chengchao, Mu, Wenmin, Kong, Zhe, Li, Yan, Wang, Zhongwei, Yu, Qing, Cheng, Guiqing, Chen, Long
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9824879/
https://www.ncbi.nlm.nih.gov/pubmed/36616382
http://dx.doi.org/10.3390/polym15010032
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author Li, Xiangyao
Zhang, Jie
Liu, Chengchao
Mu, Wenmin
Kong, Zhe
Li, Yan
Wang, Zhongwei
Yu, Qing
Cheng, Guiqing
Chen, Long
author_facet Li, Xiangyao
Zhang, Jie
Liu, Chengchao
Mu, Wenmin
Kong, Zhe
Li, Yan
Wang, Zhongwei
Yu, Qing
Cheng, Guiqing
Chen, Long
author_sort Li, Xiangyao
collection PubMed
description Polyolefin suffers from degradation during processing and application. To prolong the service life, antioxidants are needed in the packing formula of polyolefin products. The usage of natural antioxidants could avoid potential health hazards aroused by synthetic ones. Pine needles have long lives and hardly rot, suggesting their high resistance to degradation. To provide a new candidate of natural antioxidants and add more value to pine needles, pine needle extracts (PNE) were investigated as the antioxidant of linear low-density polyethylene (LLDPE). PNE-modified LLDPE (PE-PNE) exhibited much better short-term and long-term aging resistance than pure LLDPE (PE): Oxidation induction time (OIT) of PE-PNE was 52 times higher than that of PE, and the increments of carbonyl index (CI) of PE-PNE-1st samples placed under daylight and in the dark were approximately 75% and 63% of PE under the same conditions. It could be attributed to the attractive antioxidant capacity of PNE (IC(50) of DPPH radical scavenging was 115 μg/mL). In addition, the PE-PNE sample showed high processing stability and maintenance of the mechanical property during multiple extrusions: only a 0.2 g/10 min decrease in melting flow rate was found after five extrusions; the tensile strength and elongation at break were almost unchanged. All results reveal that pine needle extracts could play a role in LLDPE stabilization. Moreover, as pine needles are mainly considered a kind of waste, the present study would benefit the budget-reducing polyolefin industry.
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spelling pubmed-98248792023-01-08 Effects of Pine Needle Extracts on the Degradation of LLDPE Li, Xiangyao Zhang, Jie Liu, Chengchao Mu, Wenmin Kong, Zhe Li, Yan Wang, Zhongwei Yu, Qing Cheng, Guiqing Chen, Long Polymers (Basel) Article Polyolefin suffers from degradation during processing and application. To prolong the service life, antioxidants are needed in the packing formula of polyolefin products. The usage of natural antioxidants could avoid potential health hazards aroused by synthetic ones. Pine needles have long lives and hardly rot, suggesting their high resistance to degradation. To provide a new candidate of natural antioxidants and add more value to pine needles, pine needle extracts (PNE) were investigated as the antioxidant of linear low-density polyethylene (LLDPE). PNE-modified LLDPE (PE-PNE) exhibited much better short-term and long-term aging resistance than pure LLDPE (PE): Oxidation induction time (OIT) of PE-PNE was 52 times higher than that of PE, and the increments of carbonyl index (CI) of PE-PNE-1st samples placed under daylight and in the dark were approximately 75% and 63% of PE under the same conditions. It could be attributed to the attractive antioxidant capacity of PNE (IC(50) of DPPH radical scavenging was 115 μg/mL). In addition, the PE-PNE sample showed high processing stability and maintenance of the mechanical property during multiple extrusions: only a 0.2 g/10 min decrease in melting flow rate was found after five extrusions; the tensile strength and elongation at break were almost unchanged. All results reveal that pine needle extracts could play a role in LLDPE stabilization. Moreover, as pine needles are mainly considered a kind of waste, the present study would benefit the budget-reducing polyolefin industry. MDPI 2022-12-22 /pmc/articles/PMC9824879/ /pubmed/36616382 http://dx.doi.org/10.3390/polym15010032 Text en © 2022 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Li, Xiangyao
Zhang, Jie
Liu, Chengchao
Mu, Wenmin
Kong, Zhe
Li, Yan
Wang, Zhongwei
Yu, Qing
Cheng, Guiqing
Chen, Long
Effects of Pine Needle Extracts on the Degradation of LLDPE
title Effects of Pine Needle Extracts on the Degradation of LLDPE
title_full Effects of Pine Needle Extracts on the Degradation of LLDPE
title_fullStr Effects of Pine Needle Extracts on the Degradation of LLDPE
title_full_unstemmed Effects of Pine Needle Extracts on the Degradation of LLDPE
title_short Effects of Pine Needle Extracts on the Degradation of LLDPE
title_sort effects of pine needle extracts on the degradation of lldpe
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9824879/
https://www.ncbi.nlm.nih.gov/pubmed/36616382
http://dx.doi.org/10.3390/polym15010032
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