Improving properties of natural rubber/polyamide 12 blends through grafting of diacetone acrylamide functional group

2017 ◽  
Vol 28 (9) ◽  
pp. 1148-1155 ◽  
Author(s):  
Bencha Thongnuanchan ◽  
Suwat Rattanapan ◽  
Kosalee Persalea ◽  
Anoma Thitithammawong ◽  
Skulrat Pichaiyut ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Functional Group ◽  
Polyamide 12 ◽  
Diacetone Acrylamide

Phase Morphology, Thermal and Mechanical Properties of Compatibilized Nylon12/Natural Rubber Blends Using PS/MNR

2013 ◽  
Vol 844 ◽  
pp. 53-56
Author(s):  
Saravalee Saengthaveep ◽  
Sadhan C. Jana ◽  
Rathanawan Magaraphan
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Moisture Absorption ◽  
Rubber Particle ◽  
Impact Resistance ◽  
Phase Morphology ◽  
Thermal And Mechanical Properties ◽  
Binary Blend ◽  
Polyamide 12 ◽  
The Impact

To produce a tough material for application demanding high impact resistance and low moisture absorption, melt blending of Nylon12 (Polyamide 12, PA12) and natural rubber (NR) was carried out in a brabender plasticorder at 210 °C with rotor speed of 70 rpm in the presence of polystyrene/maleated natural rubber (PS/MNR) blend as a compatibilizer. The effect of compatibilizer content (1, 3, 5, 7 and 10 phr) on phase morphology, thermal, and mechanical properties of [Nylon12/NR]/[PS/MNR] blends was investigated by using SEM, DSC, and Izod impact tester, respectively. The result revealed that PS/MNR blend improved the compatibility of Nylon12/NR blends efficiently due to the presence of amide linkage at the interfaces from the reaction between the reactive groups of MNR and the NH2 end groups of Nylon12 during mixing. A fine phase morphology (good dispersion and small dispersed phase size of NR domains in Nylon12 matrix) of [Nylon12/NR]/[PS/MNR] blends was observed at the optimum compatibilizer content of 7 phr, relating to the improvement of mechanical property. The impact energy of [Nylon12/NR]/[PS/MNR] blends was 503 J/m higher than that of neat Nylon12 (115 J/m) and Nylon12/NR binary blend (241 J/m) due to the toughening effect of rubber and proper morphology. The melting temperature of all blends did not change obviously from thermal analysis. However, the presence of rubber particle obstructed the crystallization of Nylon12 phase, leading to the decreasing of %crystallinity from 93% to around 70%.

Novel thermoplastic natural rubber based on polyamide 12 blends

2014 ◽  
Vol 47 (8) ◽  
pp. 697-718 ◽  
Author(s):  
C Nakason ◽  
M Narathichat ◽  
C Kummerlöwe ◽  
N Vennemann
Keyword(s):  
Natural Rubber ◽  
Polyamide 12 ◽  
Thermoplastic Natural Rubber

scholarly journals Free-Radical Photopolymerization of Acrylonitrile Grafted onto Epoxidized Natural Rubber

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 660
Author(s):  
Rawdah Whba ◽  
Mohd Sukor Su’ait ◽  
Lee Tian Khoon ◽  
Salmiah Ibrahim ◽  
Nor Sabirin Mohamed ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Chemical Structure ◽  
Functional Group ◽  
Loss Modulus ◽  
Epoxidized Natural Rubber ◽  
Thermal And Mechanical Properties ◽  
Sample Analysis ◽  
Free Radical Photopolymerization ◽  
Ft Ir

The exploitation of epoxidized natural rubber (ENR) in electrochemical applications is approaching its limits because of its poor thermo-mechanical properties. These properties could be improved by chemical and/or physical modification, including grafting and/or crosslinking techniques. In this work, acrylonitrile (ACN) has been successfully grafted onto ENR- 25 by a radical photopolymerization technique. The effect of (ACN to ENR) mole ratios on chemical structure and interaction, thermo-mechanical behaviour and that related to the viscoelastic properties of the polymer was investigated. The existence of the –C≡N functional group at the end-product of ACN-g-ENR is confirmed by infrared (FT-IR) and nuclear magnetic resonance (NMR) analyses. An enhanced grafting efficiency (~57%) was obtained after ACN was grafted onto the isoprene unit of ENR- 25 and showing a significant improvement in thermal stability and dielectric properties. The viscoelastic behaviour of the sample analysis showed an increase of storage modulus up to 150 × 103 MPa and the temperature of glass transition (Tg) was between −40 and 10 °C. The loss modulus, relaxation process, and tan delta were also described. Overall, the ACN-g-ENR shows a distinctive improvement in characteristics compared to ENR and can be widely used in many applications where natural rubber is used but improved thermal and mechanical properties are required. Likewise, it may also be used in electronic applications, for example, as a polymer electrolyte in batteries or supercapacitor.

scholarly journals Effects of Coagent Functionalities on Properties of Ultrafine Fully Vulcanized Powdered Natural Rubber Prepared as Toughening Filler in Rigid PVC

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 289
Author(s):  
Yiting Lin ◽  
Lunjakorn Amornkitbamrung ◽  
Phattarin Mora ◽  
Chanchira Jubsilp ◽  
Kasinee Hemvichian ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Functional Group ◽  
Scanning Calorimetry ◽  
Glycol Diacrylate ◽  
Physical Chemical ◽  
Reactive Groups ◽  
Promising Application ◽  
Dipropylene Glycol ◽  
Rigid Pvc ◽  
First Time

Ultrafine fully vulcanized powdered natural rubber (UFPNR) has a promising application as a renewable toughening modifier in polymer matrices. In this work, the effects of acrylate coagents, which had different amounts of functional groups, on properties of UFPNR produced by radiation vulcanization and spray-drying was systematically investigated for the first time. Dipropylene glycol diacrylate (DPGDA), trimethylol propane trimethaacrylate (TMPTMA), and ditrimethylol propane tetraacrylate (DTMPTA) were used as coagents with two, three, and four acrylate groups, respectively. The radiation in the range of 250 to 400 kGy and coagent contents of up to 11 phr were used in the production process. Physical, chemical, and thermal properties of the UFPNR were characterized by swelling analysis, scanning electron microscopy, infrared spectroscopy, thermogravimetric analysis, and differential scanning calorimetry. The properties of UFPNR produced by using different type and content of coagents were compared and discussed. The results revealed that UFPNR with the smallest particle size of 3.6 ± 1.1 μm and the highest thermal stability (Td5 = 349 °C) could be obtained by using DTMPTA, which had the highest amount of functional group. It was proposed that the coagent with the greater number of acrylate groups enhanced the crosslinking of natural rubber as it had more reactive groups. Finally, an application of UFPNR as a toughening filler in rigid PVC was demonstrated with 34% improvement of impact strength.

An Optimization Study on the Inclusion of Aluminium Hydroxide into Natural Rubber Latex as Deproteinization Agent

2013 ◽  
Vol 844 ◽  
pp. 399-405
Author(s):  
Lim Keuw Keuw Wei ◽  
Khairiah Haji Badri ◽  
Wong Chong Ban
Keyword(s):  
Fourier Transform ◽  
Natural Rubber ◽  
Protein Content ◽  
Functional Group ◽  
Ph Value ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Optimum Amount ◽  
Optimization Study ◽  
Preliminary Study

A preliminary study was conducted to investigate the effect of aluminum hydroxide (ATH) as a deproteinizing agent in commercial natural rubber latex (NRL) onto the physicochemical properties of the NRL. The loading of ATH in NRL was varied at 0.05 parts per hundred rubbers (phr), 0.10 phr, 0.15 phr and 0.20 phr. The optimum amount of ATH in NRL was determined from pH value, mechanical strength time (MST), protein content and Fourier Transform Infrared spectroscopy. The addition of ATH in NRL reduced the protein content of NRL (3.52%) to the lowest (1.19%) at 0.15 phr ATH. Protein-aluminate complex was detected from the FTIR spectra through peak at 3498 cm-1, referred to as C-N-H functional group.

Thermoplastic natural rubber based on polyamide-12 blended with various types of natural rubber

2012 ◽  
Vol 45 (1) ◽  
pp. 47-75 ◽  
Author(s):  
Charoen Nakason ◽  
Maswanee Narathichat ◽  
Claudia Kummerlöwe ◽  
Norbert Vennemann
Keyword(s):  
Natural Rubber ◽  
Polyamide 12 ◽  
Thermoplastic Natural Rubber
Sign in / Sign up

Export Citation Format

Share Document