Thermoplastic Natural Rubber Based on Blending of Maleated Natural Rubber and Copolyester: Effect of Blend Ratios on Mechanical, Thermal, Dynamic and Morphological Properties

2012 ◽  
Vol 626 ◽  
pp. 66-70 ◽  
Author(s):  
Suwaiyah Lamlaeh ◽  
Azizon Kaesaman ◽  
Charoen Nakason
Keyword(s):  
Natural Rubber ◽  
Morphological Properties ◽  
Thermoplastic Natural Rubber ◽  
Blend Ratios ◽  
Maleated Natural Rubber

Thermoplastic Natural Rubber of Co-Polyamide: Effect of Blend Ratios on Mechanical, Swelling, Dynamic and Morphological Properties

2013 ◽  
Vol 844 ◽  
pp. 89-92
Author(s):  
Boripat Sripornsawat ◽  
Azizon Kaesaman ◽  
Charoen Nakason
Keyword(s):  
Natural Rubber ◽  
Dynamic Properties ◽  
Complex Viscosity ◽  
Continuous Phase ◽  
Morphological Properties ◽  
Elongation At Break ◽  
Degree Of Swelling ◽  
Tan Δ ◽  
Thermoplastic Natural Rubber ◽  
Blend Ratios

Maleated natural rubber (MNR) was synthesized and formulated to prepare thermoplastic natural rubber (TPNR) by blending with co-polyamide (COPA). It was found that 100% modulus, tensile strength, elongation at break, hardness and degree of swelling increased with increasing proportion of COPA. However, degree of swelling and tension set value decreased which reflects enhancing of rubber elasticity. Dynamic properties were also determined by a rotor less oscillating shear rheometer (Rheo Tech MDpt). It was found that increasing proportion of MNR caused increasing of storage modulus and complex viscosity but decreasing tan δ value. Morphological properties were also determined by SEM technique. It was found that the MNR/COPA simple blends with the proportion of rubber 40, 50 and 60 wt% exhibited the co-continuous phase structures.

Properties of Thermoplastic Natural Rubber (TPNR): Influence of Polypropylene Grades on TPNR Properties

2013 ◽  
Vol 844 ◽  
pp. 127-130 ◽  
Author(s):  
Chanida Manleh ◽  
Charoen Nakason ◽  
Natinee Lopattananon ◽  
Azizon Kaesaman
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Crosslink Density ◽  
Rubber Particle ◽  
Complex Viscosity ◽  
Morphological Properties ◽  
Dynamic Vulcanization ◽  
Thermoplastic Natural Rubber ◽  
Pp Blends ◽  
Vulcanization Process

Thermoplastic vulcanizate (TPV) based on natural rubber (NR) and polypropylene (PP) blends were successfully prepared through a dynamic vulcanization process using Brabender Plastograph EC Plus with a rotor speed of 60 rpm at 180°C. Sulfur vulcanization system was used to cure rubber phase in the TPVs. Three grades of PP (i.e., PP700J, HP553R and HP544T) were used to blend with NR at a fixed blend ratio of NR/PP = 60/40. The mechanical properties, crosslink density, complex viscosity and morphological properties of the blends were examined. The results revealed that the dynamically cured NR/PP700J samples showed the best mechanical properties because of higher crosslink density and smaller rubber particle size when compared with those of the blends combined with HP553R and HP544T. Furthermore, the complex viscosity of the TPVs was highest for the blends with PP700J.

Effect of Modified Natural Rubber on Properties of Thermoplastic Natural Rubber Based on Co-Polyamide Blends

2012 ◽  
Vol 626 ◽  
pp. 233-236 ◽  
Author(s):  
Boripat Sripornsawat ◽  
Charoen Nakason ◽  
Azizon Kaesaman
Keyword(s):  
Natural Rubber ◽  
Interfacial Adhesion ◽  
Grain Morphology ◽  
Thermoplastic Elastomers ◽  
Morphological Properties ◽  
Oil Resistance ◽  
Different Types ◽  
Rubber Phase ◽  
Thermoplastic Natural Rubber ◽  
Good Set

Thermoplastic elastomers (TPEs) based on natural rubber (NR)/co-polyamine (COPA) blends with different types of NR (i.e., unmodified NR, MNR, ENR-30 and ENR-50) were prepared using simple blend technique. Mechanical, elastic, oil resistant and morphological properties were investigated. The main objective was to prepare TPEs based on NR with good set property and oil resistance. It was found that the blends with modified NRs exhibited higher moduli, tensile strength, oil resistance and elastic properties than the blend with NR. This is due to higher interaction between functional groups of modified NRs (i.e., ENR and MNR) and COPA. Furthermore, the blends using modified NRs showed finer grain morphology than the blend with NR. This may be caused by higher interfacial adhesion between rubber phase and COPA matrix.

Influence of Blend Proportions on Properties of ENR-25/TPU Simple Blends

2013 ◽  
Vol 844 ◽  
pp. 93-96
Author(s):  
Skulrat Pichaiyut ◽  
Charoen Nakason ◽  
Ekwipoo Kalkornsurapranee ◽  
Norbert Vennemann ◽  
Claudia Kummerlöwe
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Thermoplastic Polyurethane ◽  
Polymer Melt ◽  
Continuous Phase ◽  
Morphological Properties ◽  
Elongation At Break ◽  
Soft Segments ◽  
Lower Elongation ◽  
Thermoplastic Natural Rubber

Thermoplastic natural rubber (TPNR) based on blending of thermoplastic polyurethane (TPU) and epoxidized natural rubber with 25 mol % epoxide (ENR-25) was prepared by simple blend technique. Influence of various blend proportions was investigated. It was found that an incorporation of rubber caused decreasing of mechanical properties in terms of tensile strength, elongation at break and hardness. This is attributed to incorporation of rubber phase may cause chain restriction of the soft segments in TPU and hence lower elongation at break and tensile strength. It was also found that the tension set value decreased with increasing proportion of natural rubber which indicates greater elasticity or tendency to recover to the original shape after prolonged deformation. Additionally, shear stress and shear viscosity of the blends increased with increasing rubber proportions due to higher viscosity of the ENR-25 component which leads to higher force to compress the polymer melt flowing through a capillary channel. Morphological properties of the simple blend with various blend proportions exhibited formation of co-continuous phase structure was observed where larger rubber formation are observed in the blend with higher content of ENR-25 phase.

Effect of Mixing Temperature on the Mechanical Dynamic and Morphological Properties of Maleated Natural Rubber/Copolyester Blends

2013 ◽  
Vol 844 ◽  
pp. 105-108
Author(s):  
Suwaiyah Lamlaeh ◽  
Azizon Kaesaman ◽  
Charoen Nakason
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Morphological Properties ◽  
Tan Δ ◽  
Internal Mixer ◽  
Maleated Natural Rubber

Maleated natural rubber/copolyester (MNR/COPE) blends with different mixing temperatures were prepared by using an internal mixer (Brabender® GmbH & Co.KG, Duisburg, Germany). The effect of mixing temperatures on mechanical, dynamic and morphological properties has been investigated. It was found that the mixing temperature at 190 ̊°C provided the blend with the highest tensile strength. While the mixing temperature at 170 °C showed superior elastomeric properties, in terms of tension set and tan δ with the finest morphology.

Investigation of Structure-Properties Relationship of High Performance TPV Based on ENR/TPU

2013 ◽  
Vol 844 ◽  
pp. 113-116 ◽  
Author(s):  
Ekwipoo Kalkornsurapranee ◽  
Charoen Nakason ◽  
Skulrat Pichaiyut ◽  
Claudia Kummerlöwe ◽  
Norbert Vennemann
Keyword(s):  
Natural Rubber ◽  
Functional Groups ◽  
High Performance ◽  
Grain Morphology ◽  
Morphological Properties ◽  
Dynamic Vulcanization ◽  
Thermoplastic Natural Rubber ◽  
Polar Functional Groups ◽  
Relationship Of ◽  
Structure Properties

Thermoplastic natural rubber based on blending of ENR-50/TPU and un-modified NR/TPU was prepared via dynamic vulcanization technique. Influences types of natural rubber (i.e., un-modified NR and ENR-50) on mechanical and morphological properties of the blends were investigated. It was found that the blends with ENR-50 exhibited superior properties than that of the blend with unmodified NR. This is attributed to the interactions between the functional groups of ENR molecules and polar functional groups in TPU molecules which caused higher interfacial adhesion and interaction between both phases. The chemical interactions were confirmed by ATR-FTIR. Furthermore, it was found that the ENR-50/TPU blend showed smaller and finer grain morphology compared with the un-modified NR/TPU.

Mechanical and Morphological Properties Evaluation of HDPE/Organoclay Nanocomposites with Various Percentages of NR Content

2011 ◽  
Vol 471-472 ◽  
pp. 115-120
Author(s):  
Engku Zaharah Engku Zawawi ◽  
Ahmad Haji Sahrim ◽  
Rozaidi Rashid
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Morphological Properties ◽  
Silicate Layer ◽  
X Ray ◽  
Transmission Electron ◽  
The Matrix ◽  
Izod Impact ◽  
Thermoplastic Natural Rubber ◽  
Internal Mixer

Nanocomposites prepared from blend of high density polyethylene (HDPE), natural rubber (NR) and organoclay were melt compounded using an internal mixer. The phase morphology and mechanical properties of this thermoplastic natural rubber nanocomposites samples were examined. The transmission electron microscope (TEM) and wide angle X-ray scattering (WAXS) was used to determine the exfoliation of organoclay in this blend. The tensile and Izod impact test were used to evaluate the mechanical properties of HDPE/organoclay nanocomposites with and without the presence of NR. The Izod impact results shows an improvement more than 300% with addition of 10% NR content in the matrix. The X-ray diffraction results indicated intercalation of blend into the silicate interlayer of nano-filler I.44P and partially exfoliation of silicate layer into the blend. The SEM morphology revealed that there was some part of uneven dispersion of organoclay in the blend.

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