scholarly journals The impact of crosslinking monomers concentration on the properties of unsaturated polyester resins

2017 ◽  
Vol 72 (1) ◽  
pp. 13
Author(s):  
Artur Chabros ◽  
Barbara Gawdzik
Keyword(s):  
Thermal Properties ◽  
Maleic Anhydride ◽  
Mechanical Behaviour ◽  
Diethylene Glycol ◽  
Unsaturated Polyester ◽  
Mechanical And Thermal Properties ◽  
Glycol Dimethacrylate ◽  
Polyester Resins ◽  
Unsaturated Polyester Resins ◽  
The Impact

<p>The article illustrates the preparation of unsaturated polyester as well as the mechanical and thermal properties of his copolymers with crosslinking monomers (styrene and diethylene glycol dimethacrylate). The starting polyester was obtained from maleic anhydride, propylene glycol and isobutanol. The prepared series of unsaturated polyester resins were subjected to different studies concerning evaluation of their viscosity, mechanical and thermal properties and also dynamic mechanical behaviour (DMA).</p>

scholarly journals Composites of Unsaturated Polyester Resins with Microcrystalline Cellulose and Its Derivatives

Materials ◽  
2019 ◽  
Vol 13 (1) ◽  
pp. 62 ◽  
Author(s):  
Artur Chabros ◽  
Barbara Gawdzik ◽  
Beata Podkościelna ◽  
Marta Goliszek ◽  
Przemysław Pączkowski
Keyword(s):  
Thermal Properties ◽  
Flexural Strength ◽  
Microcrystalline Cellulose ◽  
Unsaturated Polyester ◽  
Hydroxyl Groups ◽  
Resin Composites ◽  
Polyester Resins ◽  
Unsaturated Polyester Resins ◽  
Hydrophilic Character

The paper investigates the properties of unsaturated polyester resins and microcrystalline cellulose (MCC) composites. The influence of MCC modification on mechanical, thermomechanical, and thermal properties of obtained materials was discussed. In order to reduce the hydrophilic character of the MCC surface, it was subjected to esterification with the methacrylic anhydride. This resulted in hydroxyl groups blocking and, additionally, the introduction of unsaturated bonds into its structure, which could participate in copolymerization with the curing resin. Composites of varying amounts of cellulose as a filler were obtained from modified MCC and unmodified (comparative) MCC. The modification of MCC resulted in obtaining composites characterized by greater flexural strength and strain at break compared with the analogous composites based on the unmodified MCC.

Mechanical and Thermal Properties of Rubber Toughened Carbon Black-Filled Polyester Composite

2013 ◽  
Vol 812 ◽  
pp. 163-168 ◽  
Author(s):  
Mohd Redzuan Aein Afina ◽  
Bonnia Noor Najmi ◽  
Shuhaimen Siti Shakirah ◽  
Siti Norasmah Surip
Keyword(s):  
Thermal Properties ◽  
Carbon Black ◽  
Unsaturated Polyester ◽  
Impact Testing ◽  
Mechanical And Thermal Properties ◽  
Heat Flow Rate ◽  
Scanning Calorimetry ◽  
Rubber Toughened ◽  
Polyester Composite ◽  
The Impact

The influences of Carbon Black (CB) as filler for rubber toughened polyester composite on thermal properties were investigated, in consideration for applications such as automotive parts and integrated circuits (IC) encapsulations. The usage of CB as filler is one of the efforts in increasing and varying the use of rubber and unsaturated polyester thermoset in composite materials. Unsaturated polyester was mixed with 3% liquid natural rubber (LNR) as toughening agent and CB, which were varied from 0, 2, 4, 6, 8, and 10% using mechanical stirrer and moulded by using the open mould technique. Impact testing was conducted for mechanical property and it was found that the addition of CB increased the impact strength by 87%. Thermal properties of the composites were evaluated using a thermogravimetric analyzer (TGA) and differential scanning calorimetry (DSC). The TGA curves of the composites were quite similar, but there were slight increment in thermal stability for several CB filled composites compared to the neat polyester matrix. DSC analysis showed that all the composites were fully cured, and CB filled composites had a slower heat flow rate compared to the neat rubber toughened composite.

scholarly journals R&D and LCA Across the Supply Chain: Choice of Unsaturated Polyester Resins for CC-GRP Pipe Systems

2017 ◽  
Vol 11 (2) ◽  
pp. 49-62
Author(s):  
Victor Vladimirov ◽  
Marcin Pazdro ◽  
Thomas Simoner ◽  
Ioan Bica
Keyword(s):  
Supply Chain ◽  
Unsaturated Polyester ◽  
Environmental Indicators ◽  
Recycled Pet ◽  
Polyester Resins ◽  
Centrifugally Cast ◽  
Pipe System ◽  
Unsaturated Polyester Resins ◽  
Pipe Systems ◽  
The Impact

Abstract In today’s economy increased attention is given towards re-using of available resources and using of resources which are re-generable, to evaluate and reduce the impact on the environment. For the polymer industry, the development of alternative and renewable raw materials represents an essential task. The study evaluates the different choices of unsaturated polyester resins (UPR) for production of centrifugally-cast glass reinforced pipe (cc-GRP) systems. The environmental impacts of three types of resin were evaluated and compared. The resins are: UPR standard, UPR containing recycled PET material (rPET-UPR) and UPR containing bio-sourced material (BIO-UPR). The analysis focuses on comparing the variations in environmental indicators caused by resin selection for three increasingly complex product layers (Base plate of cc-GRP shaft, cc-GRP Shaft and 1km cc-GRP Pipe-system). The study equally provides an insight onto R&D and LCA collaboration across the supply-chain. One of the main challenges in LCA today is using specific data from the suppliers instead of generic data. The paper indicates how LCA tools and established R&D processes can be employed to transfer LCA calculations across the supply-chain. BIO-UPR and rPET-UPR are alternatives which are realistic in terms of costs and which ensure the required quality for the manufactured products. rPET-UPR can be used for production of complete pipe systems, with positive environmental indicators. Mechanical proprieties of BIO-UPR restrict its usability and use of this resin presents similarities with the debate regarding use of bio-diesel.

Effect of Compatibilizers on Mechanical and Thermal Properties of High Density Polyethylene Filled with Bio-Filler from Eggshell

2013 ◽  
Vol 699 ◽  
pp. 57-62
Author(s):  
Wanikorn Buakaew ◽  
Ruksakulpiwat Yupaporn ◽  
Nitinat Suppakarn ◽  
Wimonlak Sutapun
Keyword(s):  
Thermal Properties ◽  
Maleic Anhydride ◽  
Impact Strength ◽  
High Density Polyethylene ◽  
Average Particle Size ◽  
High Density ◽  
Degree Of Crystallinity ◽  
Average Particle ◽  
Mechanical And Thermal Properties ◽  
The Impact

In this research work, the effect of compatibilizers on mechanical and thermal properties of ESP/HDPE composites was investigated. High density polyethylene grafted with maleic anhydride (HDPE-g-MA) and ethylene propylene rubber grafted with maleic anhydride (EPR-g-MA) were used to compatibilize the ESP/HDPE composites. The ESP/HDPE composite with and without the compatibilizes was prepared at 20 wt.% ESP. The volume average particle size of ESP was 20.35 µm. The compatibilized HDPE composites were prepared at 2, 5, 8 and 10 wt.% of HDPE-g-MA and at 2, 5, 8 and 10 wt.% of EPR-g-MA, as well. It was found that ultimate stress, yield strength, and elongation at break of the ESP/HDPE composites prepared with HDPE-g-MA increased with increasing HDPE-g-MA content. In addition, Young’s modulus was maximum at 8 wt.% HDPE-g-MA. The composites filled with HDPE-g-MA had improved impact strength with increasing HDPE-g-MA content. On the other hand, the composites with EPR-g-MA showed a decrease in tensile properties and impact strength when increasing EPR-g-MA content. The impact strength of the HDPE composites compatibilized with EPR-g-MA decreased with increasing EPR-g-MA content. In addition, degree of crystallinity of the composites with EPR-g-MA was higher than that of the composite with HDPE-g-MA. Furthermore, compatibilizing ESP/HDPE composites with either HDPE-g-MA or EPR-g-MA did not influence HDPE and ESP decomposition temperatures, HDPE melting temperature and HDPE crystallization temperature.

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