Very Sensitive 13C NMR Method for the Detection and Quantification of Long-Chain Branches in Ethylene–Hexene Linear Low-Density Polyethylene

2021 ◽  
Author(s):  
Zhe Zhou ◽  
Clemens Anklin ◽  
Rainer Kuemmerle ◽  
Rongjuan Cong ◽  
Xiaohua Qiu ◽  
...  
Keyword(s):  
13C Nmr ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Nmr Method ◽  
Long Chain ◽  
Detection And Quantification

13C NMR Determination of the Composition of Linear Low-Density Polyethylene Obtained with [η3-Methallyl-nickel-diimine]PF6Complex

1999 ◽  
Vol 32 (5) ◽  
pp. 1620-1625 ◽  
Author(s):  
Griselda Barrera Galland ◽  
Roberto F. de Souza ◽  
Raquel Santos Mauler ◽  
Fernanda F. Nunes
Keyword(s):  
13C Nmr ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene

Determination of the composition of common linear low density polyethylene copolymers by 13C-NMR spectroscopy

1991 ◽  
Vol 42 (2) ◽  
pp. 399-408 ◽  
Author(s):  
M. De Pooter ◽  
P. B. Smith ◽  
K. K. Dohrer ◽  
K. F. Bennett ◽  
M. D. Meadows ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
13C Nmr ◽  
13C Nmr Spectroscopy ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene

scholarly journals Identification of the LLDPE Constitutive Material Model for Energy Absorption in Impact Applications

Polymers ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1537
Author(s):  
Luděk Hynčík ◽  
Petra Kochová ◽  
Jan Špička ◽  
Tomasz Bońkowski ◽  
Robert Cimrman ◽  
...  
Keyword(s):  
Strain Rate ◽  
Material Model ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Stress Strain ◽  
Rate Dependent ◽  
Constitutive Material Model ◽  
Principal Directions ◽  
Constitutive Material

Current industrial trends bring new challenges in energy absorbing systems. Polymer materials as the traditional packaging materials seem to be promising due to their low weight, structure, and production price. Based on the review, the linear low-density polyethylene (LLDPE) material was identified as the most promising material for absorbing impact energy. The current paper addresses the identification of the material parameters and the development of a constitutive material model to be used in future designs by virtual prototyping. The paper deals with the experimental measurement of the stress-strain relations of linear low-density polyethylene under static and dynamic loading. The quasi-static measurement was realized in two perpendicular principal directions and was supplemented by a test measurement in the 45° direction, i.e., exactly between the principal directions. The quasi-static stress-strain curves were analyzed as an initial step for dynamic strain rate-dependent material behavior. The dynamic response was tested in a drop tower using a spherical impactor hitting a flat material multi-layered specimen at two different energy levels. The strain rate-dependent material model was identified by optimizing the static material response obtained in the dynamic experiments. The material model was validated by the virtual reconstruction of the experiments and by comparing the numerical results to the experimental ones.

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