Results 61 to 70 of about 4,008 (250)

Desenvolvimento de Materiais à Base de Poliolefinas e Elastômeros Metalocênicos

Polímeros, 2001
O presente trabalho teve por objetivo avaliar as propriedades mecânicas, térmicas e morfológicas de sistemas à base de poliolefinas (PP e HDPE) e copolímero metalocênico de etileno/1-octeno (EOC), produzido pela Dow Chemical.
Ana L. N. Silva, Marisa C. G. Rocha, Maria José O. C. Guimarães, Humberto Lovisi, Fernanda M. B. Coutinho, Luiz C. Santa Maria   +5 more
doaj   +1 more source

Safety assessment of the substance α‐tocopherol acetate for use in food contact materials

EFSA Journal, 2016
This scientific opinion of the EFSA Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF) deals with the safety assessment of α‐tocopherol acetate, CAS Nos 7695‐91‐2 and 58‐95‐7, and FCM No 1055, as an antioxidant for its use in
EFSA Panel on Food Contact Materials, Enzymes, Flavourings and Processing Aids (CEF)
doaj   +1 more source

Linear Viscoelastic Behavior of n‐Alkane Diluted Polyethylene Melts: Sorption, Desorption, and Oscillatory Rheometry

Journal of Applied Polymer Science, EarlyView.
This study systematically maps polyolefin dilution dynamics using a homologous series of n‐alkanes. Integrating gravimetric sorption, subsequent controlled desorption, and oscillatory rheometry establishes a precise framework to analyze reduction in viscosity at least for polymer diluent mixtures with polymer concentration > 35% and diluent ...
Ernst Georg Viehböck, Georg Gschwendner, Dario Pindrić, Gunnar Spiegel, Alexander Hammer, Christian Paulik, Gerald Berger‐Weber   +6 more
wiley   +1 more source

Entropy Engineering for the Efficient Hydrogenolysis of Waste Polyolefins

Engineering
The chemical upcycling of waste plastics has emerged as a cornerstone of ecological development and the circular economy. However, the high entropy of polymers during chemical conversion severely limits catalytic activity, emphasizing the urgent need to ...
Qianyue Feng, Shengming Li, Feng Jiang, Panpan Xu, Yeping Xie, Mingyu Chu, Zhongyu Li, Weilin Tu, Muhan Cao, Qiao Zhang, Jinxing Chen   +10 more
doaj   +1 more source

Adhesion and sliding tribological properties of polyolefins treated by diffuse coplanar surface barrier discharges

eXPRESS Polymer Letters, 2018
A study is presented on the plasma treatment of two different ultra-high molecular weight polyethylene (UHMWPE) and polypropylene (PP) surfaces by using diffuse coplanar surface barrier discharges under atmospheric air conditions.
A. Saranko, Z. Szakal, G. Kalacska, P. Samyn, J. Sukumaran, S. Klebert, Z. Karoly   +6 more
doaj   +1 more source

Valorization of Post‐Consumer Waste From Metallized Flexible Packaging and Industrial EPM Waste: Development of Sustainable Composites

Journal of Applied Polymer Science, EarlyView.
Post‐consumer metallized flexible packaging waste and industrial EPM waste are transformed into sustainable composites through mechanical recycling. The incorporation of 30 wt% EPM provides the most favorable balance between stiffness, ductility, and impact resistance, achieving 53.36 kJ/m2.
Tiago O. Oliveira, Samara L. Santos, Ruth M. C. Santana   +2 more
wiley   +1 more source

Key Challenges for Commercializing Perovskite–Silicon Tandem Solar Cells

Carbon Energy, EarlyView.
This review discusses the scientific and technological challenges in advancing perovskite–silicon tandem solar cells (PSTSCs) from lab‐scale to commercial viability, focusing on long‐term stability, scalability, and economic feasibility. Key issues include intrinsic and extrinsic degradation factors, installation conditions, environmental impacts, and ...
Bilal Mehmood, Yuanyuan Qin, Abdul Sattar, Rabeea Eman, Faheem Abbas, Shan Wu, Yipeng Xu, Xu Zheng, Jiangying Lu, Wei Jiang, Jiankai Liu, Shudi Lu, Shizhong Yue, Zhijie Wang, Kong Liu, Xiaopeng Zheng, Shengchun Qu   +16 more
wiley   +1 more source

Upcycling Real‐World Post‐Consumer Polyolefins Plastics Into Light Olefins Via Microwave‐Assisted Processing

Carbon Energy, EarlyView.
Microwave‐driven Ru@α‐Fe2O3 selectively upgrades real‐world post‐consumer mixed polyolefin waste into light olefins with high gas yields and olefin selectivity at markedly reduced temperatures compared with conventional thermal pyrolysis. Strong tolerance of additives and feed heterogeneity highlights an energy‐efficient and scalable route for circular
Yi Su, Chunlin Luo, Md Emdadul Haque, Kangqi Gao, Brandon Robinson, Yujuan Chen, Debangsu Bhattacharyya, Jianli Hu, Yuxin Wang   +8 more
wiley   +1 more source

Effects of low-dose electron beam irradiation on linear low density polyethylene/ternary copolymer polypropylene polyolefin structure and properties

Fushe yanjiu yu fushe gongyi xuebao
This study investigated the impact of low-dose electron beam irradiation on the structure-property correlation of linear low-density polyethylene (LLDPE), ternary copolymer polypropylene (co-PP), and their blends.
ZHANG Maojiang, WU Yanfu, CUI Kexin, ZHANG Xinwei, WANG Jinghua, DONG Chunlei, GAN Jie, WU Guozhong   +7 more
doaj   +1 more source

One century of teaching, research, and innovation in chemical engineering in Mexico: The role of chemical engineering in the background and future of polymer science and industrial production in Mexico

The Canadian Journal of Chemical Engineering, EarlyView.
Timeline of key academic milestones and individuals that shaped chemical engineering at FQ‐UNAM and in Mexico. Abstract One hundred years after the beginning of the teaching of Chemical Engineering in Mexico, which started in 1925 in the former National School of Chemical Sciences, currently Faculty of Chemistry (FQ) at National Autonomous University ...
Patricia Pérez‐Salinas, Alberto Rosas‐Aburto, Eduardo Vivaldo‐Lima   +2 more
wiley   +1 more source