Comparison of QUV accelerated weathering to outdoor exposure for PVC compounds

1991 ◽  
Vol 13 (1) ◽  
pp. 42-46 ◽  
Author(s):  
Elvira B. Rabinovitch ◽  
Robert S. Butler
Keyword(s):  
Outdoor Exposure ◽  
Accelerated Weathering

Exposure of Polymeric Glazing Materials Using NREL’s Ultra-Accelerated Weathering System (UAWs)

2010 ◽  
Author(s):  
Carl Bingham ◽  
Gary Jorgensen ◽  
Amy Wylie
Keyword(s):  
Light Intensity ◽  
Thermal Effects ◽  
Outdoor Exposure ◽  
Exposure Chamber ◽  
Accelerated Weathering ◽  
Intensity Level ◽  
Design And Implementation ◽  
Different Temperatures ◽  
Exposure Testing ◽  
Ultraviolet Irradiance

NREL’s Ultra-Accelerated Weathering System (UAWS) selectively reflects and concentrates natural sunlight ultraviolet irradiance below 475 nm onto exposed samples to provide accelerated weathering of materials while keeping samples within realistic temperature limits. This paper will explain the design and implementation of the UAWS which allow it to simulate the effect of years of weathering in weeks of exposure. Exposure chamber design and instrumentation will be discussed for both a prototype UAWS used to test glazing samples as well as a commercial version of UAWS. Candidate polymeric glazing materials have been subjected to accelerated exposure testing at a light intensity level of up to 50 UV suns for an equivalent outdoor exposure in Miami, FL exceeding 15 years. Samples include an impact modified acrylic, fiberglass, and polycarbonate having several thin UV-screening coatings. Concurrent exposure is carried out for identical sample sets at two different temperatures to allow thermal effects to be quantified along with resistance to UV.

scholarly journals Temperate UV-Accelerated Weathering Cycle Combined with HT-GPC Analysis and Drop Point Testing for Determining the Environmental Instability of Polyethylene Films

Polymers ◽  
2021 ◽  
Vol 13 (14) ◽  
pp. 2373
Author(s):  
Celine Moreira ◽  
Richard Lloyd ◽  
Gavin Hill ◽  
Florence Huynh ◽  
Ana Trufasila ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Outdoor Exposure ◽  
Accelerated Weathering ◽  
Polyethylene Films ◽  
Parallel Testing ◽  
Mapping Analysis ◽  
Environmental Instability ◽  
Weight Analysis ◽  
Physical Changes ◽  
Ir Spectroscopic

Polyethylene films are one of the most frequently used packaging materials in our society, due to their combination of strength and flexibility. An unintended consequence of this high use has been the ever-increasing accumulation of polyethylene films in the natural environment. Previous attempts to understand their deterioration have either focused on their durability using polymer analysis; or they have focused on changes occurring during outdoor exposure. Herein, this study combines those strategies into one, by studying the chemical and physical changes in the polyethylene structure in a laboratory using molecular weight and IR spectroscopic mapping analysis, combined with temperate UV-accelerated weathering cycles. This approach has been correlated to real-world outdoor exposure timeframes by parallel testing of the sample polyethylene films in Florida and France. The formation of polyethylene microparticles or polyethylene waxes is elucidated through comparison of drop point testing and molecular weight analysis.

scholarly journals Correlation of a Temperate UV-Weathering Cycle to Outdoor Exposure for the Determination of the Environmental Instability of Polyethylene Films Using HT-GPC Analysis

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 591
Author(s):  
Gavin Hill ◽  
Celine Moreira ◽  
Florence Huynh ◽  
Ana Trufasila ◽  
Faith Ly ◽  
...  
Keyword(s):  
Physical Property ◽  
Gel Permeation Chromatography ◽  
Outdoor Exposure ◽  
Accelerated Weathering ◽  
Micro Particles ◽  
Exposure Site ◽  
Plastic Materials ◽  
Physico Chemical ◽  
Environmental Instability ◽  
Insight Into

Accelerated UV-weathering cycles are predominately used for evaluating the durability of plastic materials, particularly polyethylene (PE) films. The point of failure for this testing is usually the loss of a physical property, such as the loss of tensile strength over time. For plastics designed to be instable under environmental conditions, the accelerated weathering cycles are yet to be defined and their correlation to outdoor exposure has yet to be made. This study demonstrates the utility of a newly defined temperate accelerated UV-weathering cycle, recently codified in the British Standard PAS 9017:2020. In addition, the effectiveness of the laboratory weathering cycle has been correlated to real-world outdoor exposure through simultaneous testing of the same samples at a specialist outdoor exposure site in Florida. The utility of the testing methodology and the performance of the polyethylene samples was demonstrated through the use of High Temperature Gel Permeation Chromatography (HT-GPC) analysis. The data led to a detailed insight into the physico-chemical changes occurring in the PE films upon exposure to environmental stimuli. By comparison, and surprisingly, the techniques employed appear to provide an insight into the processes in which secondary micro-particles of PE are formed from macro-polyethylene samples. The temperate accelerated UV-weathering cycle over 14 days demonstrated an approximate correlation to 90 days of outdoor exposure in Florida for the PE film studied.

scholarly journals Evaluation of the Impacts of Four Weathering Methods on Two Acrylic Paints: Showcasing Distinctions and Particularities

Coatings ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 121 ◽  
Author(s):  
Antoine Cogulet ◽  
Pierre Blanchet ◽  
Véronic Landry
Keyword(s):  
Uv Radiation ◽  
Outdoor Exposure ◽  
Accelerated Weathering ◽  
Accurate Assessment ◽  
End Use ◽  
Weathering Resistance ◽  
Weathering Process ◽  
Acrylic Paints

Two commercial waterborne wood acrylic paints were applied to wood samples and the weathering resistance of samples was tested using four different weathering methods: outdoor exposure in Arizona (USA), Florida (USA), and the province of Quebec (Canada), and accelerated weathering in a QUV (fluorescent) weatherometer. Degradation was characterised by colorimetric and FTIR analyses. FTIR confirmed the importance of paint composition in the resistance of samples to weathering. Polymer sensitivity to UV radiation was clearly evident. An interpretation of discoloration in terms of either the energy received by the samples or the length of exposure is presented. Strong differences existed between the four weathering methods. Particularities of each method are discussed and recommendations regarding their application for effective testing are proposed. Overall, in addition to accelerated weathering tests, we conclude that it is necessary to test paints in an end-use environment for accurate assessment of their likely performance. This study confirms the multifactorial aspect of the weathering process.

Polyurethan VC, a Virtually Crosslinked Elastomer

1962 ◽  
Vol 35 (3) ◽  
pp. 742-752 ◽  
Author(s):  
C. S. Schollenberger ◽  
H. Scptt ◽  
G. R. Moore
Keyword(s):  
Room Temperature ◽  
Weather Conditions ◽  
Outdoor Exposure ◽  
Accelerated Weathering ◽  
High Tensile Strength ◽  
Beneficial Effects ◽  
Ultraviolet Absorbers ◽  
Weather Resistance ◽  
Induced Changes ◽  
Ozone Resistance

Abstract Many of the outstanding physical properties that characterize elastomeric Polyurethans have been realized in a soluble, thermoplastic variety, Polyurethan VC, which displays the superficial properties of a rubbery vulcanizate at room temperature and so is considered to be virtually crosslinked. High tensile strength as well as good tear, abrasion, solvent, oil, and ozone resistance characterizes this polymer. Since these properties are realized in the unvulcanized state, many useful applications of the readily processable polymer can be made, avoiding the complications which attend the use of conventional (vulcanizing) urethan elastomers. Outdoor exposure and indoor accelerated weathering studies demonstrated a deficiency in the weather resistance of the raw polymer. Weather-induced changes, believed to be due to ultraviolet-initiated autoxidation, have been estimated by noting changes in the stress-strain properties as well as the ultraviolet and infrared absorption spectra of the polymer on exposure to natural and artificial weather conditions. The beneficial effects of certain carbon blacks, conventional antioxidants, and ultraviolet absorbers on the weather resistance of the polymer have been described.

Outdoor exposure and accelerated weathering of polyurethane/polysiloxane hybrid coatings

2019 ◽  
Vol 130 ◽  
pp. 44-57 ◽  
Author(s):  
Tongzhai Gao ◽  
Zhouying He ◽  
Lloyd H. Hihara ◽  
Hamideh Shokouhi Mehr ◽  
Mark D. Soucek
Keyword(s):  
Outdoor Exposure ◽  
Hybrid Coatings ◽  
Accelerated Weathering

scholarly journals Weatherability of Polypropylene by Accelerated Weathering Tests and Outdoor Exposure Tests in Japan

2016 ◽  
Vol 2016 ◽  
pp. 1-14 ◽  
Author(s):  
Kenichi Shimizu ◽  
Yuuki Tokuta ◽  
Akihiro Oishi ◽  
Takashi Kuriyama ◽  
Masao Kunioka
Keyword(s):  
Reference Sample ◽  
Outdoor Exposure ◽  
Accelerated Weathering ◽  
Test Machine ◽  
Exposure Test ◽  
Average Temperature ◽  
Outdoor Exposure Test ◽  
Promotion Committee ◽  
Accelerated Weathering Test ◽  
The One

As a joint study of the Polymer Subcommittee in the Industrial Technology Cooperative Promotion Committee, in which members are Japanese local governmental research institutes and National Institute of Advanced Industrial Science and Technology (AIST, Japan), carried out from 2010 to 2012, polyethylene reference sample (PE-RS) pieces and six types of polypropylene (PP) were subjected to accelerated weathering tests and outdoor exposure tests, resulting in the following findings. (1) The PE-RS was subjected to eight 100 h exposure tests in the same test machine. The accelerated weathering test machines of the participating institutes had high reproducibility. (2) The PE-RS CI values were greater when the temperature in the chamber was greater during accelerated weathering tests, and there was a high correlation with the average temperature in the outdoor exposure tests at 20 places in Japan. (3) By comparing the change in PP strength by normalizing the degradation environment using the PE-RS CI values, the accelerated weathering test with results showing the highest correlation with the outdoor exposure test results was the one with the xenon arc lamp at an irradiance of 60 W/m2 and a BPT of 63°C.

Sign in / Sign up

Export Citation Format

Share Document