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.

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.

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.

Preparation and Characterization of Nature Rubber/Attapulgite Composites

2009 ◽  
Vol 79-82 ◽  
pp. 1763-1766 ◽  
Author(s):  
Ji Hu Wang ◽  
Da Jun Chen ◽  
Hui Ling Min ◽  
Zhong Feng Tang
Keyword(s):  
Natural Rubber ◽  
Coupling Agent ◽  
Interfacial Adhesion ◽  
Melt Blending ◽  
Different Types ◽  
Infrared Spectroscopic ◽  
Blending Process

In this paper, attapulgite(AT)/nature rubber (NR) composites have been prepared through melt blending process. First, different types of attapulgite were prepared.Secend,Fourier infrared spectroscopic (FTIR) was used to analyze attapulgite.Then,different types of attapulgite were filled into natural rubber according to different proportion.Finally, The mechanisms of composites were analyzed. The results showed that siliane coupling agent Si-69 can improve the dispersion of calcined attapulgite and enhance the chemical interfacial adhesion.

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.

Influence of Curing Systems on Mechanical, Dynamic, and Morphological Properties of Dynamically Cured Epoxidized Natural Rubber/ Copolyamide Blends

2013 ◽  
Vol 844 ◽  
pp. 81-84 ◽  
Author(s):  
Rawviyanee Romin ◽  
Charoen Nakason ◽  
Anoma Thitithammawong
Keyword(s):  
Natural Rubber ◽  
Storage Modulus ◽  
Phenolic Resin ◽  
Complex Viscosity ◽  
Thermoplastic Elastomers ◽  
Epoxidized Natural Rubber ◽  
Morphological Properties ◽  
Vulcanized Rubber ◽  
Rubber Particles ◽  
Curing Systems

Thermoplastic elastomers (TPEs) based on dynamically cured epoxidized natural rubber/copolyamide (ENR/COPA) blends were prepared. Influence of curing systems (i.e., sulphur, peroxide, mixed sulphur and peroxide and phenolic resin cured systems on mechanical, dynamic and morphological properties of the blends were investigated. It was found that the blend with phenolic cured system exhibited superior mechanical and set properties. That is higher tendency to recover to its original shape after a prolong extension. It was also found that the blend with peroxide cured system exhibited higher storage modulus and complex viscosity than those of the blends with mixed sulphur and peroxide, phenolic and sulphur cured system, respectively. Furthermore, the TPVs blend with peroxide cured system showed the smallest vulcanized rubber particles.

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