Photo-Oxidative Degradation of Metallocene Linear Low-Density Polyethylene

2009 ◽  
Vol 610-613 ◽  
pp. 243-247 ◽  
Author(s):  
Fu Chen Bai ◽  
Chun Xiao Zhang ◽  
Xi Yao Zhang ◽  
Jian Liu ◽  
Wei Tian
Keyword(s):  
Oxidative Degradation ◽  
Metallocene Catalyst ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Elongation At Break ◽  
Photo Oxidation ◽  
Chemical Structures ◽  
Natta Catalyst ◽  
Physical And Chemical ◽  
Ziegler Natta Catalyst

Films of linear-low density polyethylenes, made from metallocene catalyst and Ziegler-Natta catalyst , were exposed to accelerate photo-oxidation conditions. The investigations were focused on the changes of the physical and chemical structures and elongation at break occurring in the photo-oxidation process. The results showed that ethylene-hexene m-LLDPE was more favorer to photo-oxidize than ethylene-octene LLDPE. The other two ethylene-ocetene m-LLDPEs were comparable to LLDPE with the same comonomer. The oxidation rate of LDPE is slower than those of all the LLDPEs.

Study on the effect of galbanic acid on photo-oxidative degradation of linear low density polyethylene (LLDPE) films

e-Polymers ◽  
2008 ◽  
Vol 8 (1) ◽  
Author(s):  
Reza Jahanmardi ◽  
Homa Assempour
Keyword(s):  
Oxidative Degradation ◽  
Low Density Polyethylene ◽  
Coumarin Derivatives ◽  
Linear Low Density Polyethylene ◽  
Prooxidant Activity ◽  
Neat Polymer ◽  
Carbonyl Index ◽  
Photo Oxidation ◽  
Time Periods ◽  
Galbanic Acid

AbstractPhoto-oxidative degradation of LLDPE films (~ 250 μm thick) containing varying amounts of galbanic acid (a type of coumarin derivatives) was investigated by exposing the films to an artificial sunlight (emitted by 300 W OSRAM Ultra- Vitalux lamps) at 40°C for extended time periods. Photo-oxidative degradation of the neat polymer film and the LLDPE films containing benzophenone (an active photo-initiator for PE) and coumarin alone were also studied under similar conditions for comparison. The rate of photo-oxidation was assessed by measuring tensile properties, gel content, carbonyl index, molecular weight and density. It was shown that galbanic acid was highly effective in accelerating photo-oxidation of LLDPE films and an outstanding acceleration of photo-oxidation was observed for the film containing 0.2 wt % of galbanic acid in comparison with the film containing the same amount of benzophenone. However, the film containing coumarin did not exhibit considerable difference in behaviour in photo-oxidation relative to the neat LLDPE film during the exposure time. On the basis of the obtained results, the prooxidant activity of galbanic acid was described in terms of activity of the functional groups existing in the substituted moiety of its molecules.

Initiation of oxidative degradation in polypropylene reactor powder produced by Ziegler-Natta catalyst

2017 ◽  
Vol 137 ◽  
pp. 131-137 ◽  
Author(s):  
Taira Tobita ◽  
Patchanee Chammingkwan ◽  
Minoru Terano ◽  
Toshiaki Taniike
Keyword(s):  
Oxidative Degradation ◽  
Reactor Powder ◽  
Natta Catalyst ◽  
Ziegler Natta Catalyst

Tensile Properties LLDPE/Soya Spent Powder Blends: Oven Aging

2013 ◽  
Vol 795 ◽  
pp. 429-432
Author(s):  
S.T. Sam ◽  
N.Z. Noriman ◽  
S. Ragunathan ◽  
H. Ismail
Keyword(s):  
Tensile Strength ◽  
Tensile Properties ◽  
Aging Time ◽  
Thermal Aging ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Elongation At Break ◽  
Powder Blends ◽  
Internal Mixer

Linear low-density polyethylene (LLDPE)/soya spent powder blends with different blends ratio were prepared by using internal mixer. Soya spent powder was varied from 5 to 40 wt. The thermal degradability was assessed by subjecting the dumbbell sample to oven aging. Thermal aging was carried out for 5 weeks. The degradability was measured by the periodic change in tensile properties of the blend samples. The tensile strength and elongation at break of the blends reduced as increasing the aging time. The effect of degradation was obvious in higher soya spent powder blends.

The effect of comonomer concentration and distribution on the photo-oxidative degradation of linear low density polyethylene films

Polymer ◽  
2017 ◽  
Vol 119 ◽  
pp. 66-75 ◽  
Author(s):  
Yu-Chieh Hsu ◽  
Rowan W. Truss ◽  
Bronwyn Laycock ◽  
Michael P. Weir ◽  
Timothy M. Nicholson ◽  
...  
Keyword(s):  
Oxidative Degradation ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Polyethylene Films

Tensile Properties and Morphological Studies of Kenaf-Filled Linear Low Density Polyethylene/Poly(Vinyl Alcohol) (LLDPE/PVA/KNF) Composites: The Effects of KNF Loading

2016 ◽  
Vol 1133 ◽  
pp. 156-160 ◽  
Author(s):  
Ai Ling Pang ◽  
Hanafi Ismail ◽  
Azhar Abu Bakar
Keyword(s):  
Tensile Properties ◽  
Vinyl Alcohol ◽  
Tensile Modulus ◽  
Low Density Polyethylene ◽  
Poly Vinyl Alcohol ◽  
Low Density ◽  
Linear Low Density Polyethylene ◽  
Elongation At Break ◽  
Morphological Studies ◽  
Internal Mixer

Tensile properties and morphological studies of linear low density polyethylene (LLDPE)/poly (vinyl alcohol) (PVA)/kenaf (KNF) composites were investigated. The composites with different KNF loading (0, 10, 20, 30, 40 phr) were prepared using a Thermo Haake Polydrive internal mixer at 150°C and 50 rpm for 10 min. The results indicated that tensile strength and elongation at break were decreased with increasing KNF loading, whereas tensile modulus showed the opposite trend. Tensile fractured surfaces observed by scanning electron microscopy showed better interfacial adhesion between LLDPE/PVA and KNF at 10 phr KNF loading.

Preparation and Characterization of Functionalized Graphene/Linear Low Density Polyethylene Nanocomposites

2010 ◽  
Vol 123-125 ◽  
pp. 173-176
Author(s):  
Tapas Kuila ◽  
Md Elias Uddin ◽  
Nam Hoon Kim ◽  
Gye Hyoung Yoo ◽  
Joong Hee Lee
Keyword(s):  
Xrd Analysis ◽  
Low Density Polyethylene ◽  
Low Density ◽  
Functionalized Graphene ◽  
Linear Low Density Polyethylene ◽  
X Ray Diffraction ◽  
Elongation At Break ◽  
Pure Matrix ◽  
Thermal Stability Of

The present work deals with the functionalization of graphene sheet and preparation of functionalized graphene/linier low density polyethylene (LLDPE) nanocomposites by solution-mix techniques. Dodecyl amine (DA) has been used for the surface modification of graphene oxide (GO) and hydrazine as reducing agent. Fourier transform infrared (FTIR) spectra exhibits the appearance of new peaks in the functionalized graphene (DA-G), which suggests the functionalization of graphene by DA. X-ray diffraction (XRD) analysis infers the formation of fully exfoliated DA-G/LLDPE nanocomposites. The tensile strength (TS) and elongation at break (EB) of the composites are higher in comparison to neat LLDPE. The nanocomposites with only 0.5 wt.% of DA-G content results in TS and EB to be 17% and 10% higher compared to neat LLDPE. TGA shows that the thermal stability of the DA-G/LLDPE nanocomposites is higher compared to pure matrix polymer.

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