Preparation and Properties of Polypropylene-Graft-Cardanol by Reactive Extrusion

2014 ◽  
Vol 936 ◽  
pp. 39-42
Author(s):  
Qin Hui Chen ◽  
Jin Huo Lin
Keyword(s):  
Tensile Strength ◽  
Yield Strength ◽  
Reactive Extrusion ◽  
Cross Linking ◽  
Dicumyl Peroxide ◽  
Elongation At Break ◽  
Chemical Inertness ◽  
Bamboo Powder ◽  
Aging Performance

The polypropylene-graft-cardanol (CAPP) was prepared by reactive extrusion with polypropylene (PP) and natural renewable cardanol which could improve the inherent defects of PP such as chemical inertness and hydrophobicity. Moreover, the cardanol grafted onto PP could resolve the degradation of PP during the process of reactive extrusion. In this paper, CAPP was prepared in the presence of three different kinds initiator. The compatibilization and the anti-aging performance of cardanol grafted onto PP were studied. Results showed that the initiator dicumyl peroxide (DCP) exhibited the optimum initiated efficiency. Cardanol grafted onto PP was benificial for the composite of bamboo powder and PP.The initiator of DCP caused the degradation of PP chains during the aging processing. After aged for 24 h, the yield strength decreased from 28 MPa to 15 MPa and the elongation at break reduced by 795 %. The CAPP possessed outstanding anti-aging performance owing to the cross-linking and entanglement of the side chains of cardanol grafted onto PP. The yield strength, tensile strength and the elongation at break of CAPP-DCP changed lightly even when it was in long-term irradiation for 480 h.

Preparation and Properties of DCP-Crosslinked Biobased Polyamide

2013 ◽  
Vol 634-638 ◽  
pp. 1037-1043 ◽  
Author(s):  
Xiao Xue ◽  
Qing Xiu Jia ◽  
Guo Liang Zhao
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Infrared Spectroscopy ◽  
Cross Linking ◽  
Dicumyl Peroxide ◽  
Elongation At Break ◽  
Gel Content ◽  
Dose Ranging ◽  
The Cross ◽  
Higher Doses

In this work, a new bio-based hybrid polyamide (BDIS) was prepared and was cross-linked by dicumyl peroxide (DCP) with dose ranging from 1 to 7%. The state of cure was observed in vulcameter, and the vulcanization condition was determined subsequently. The cross-linking efficiency of BDIS/DCP blends was assessed using torque, gel content measurements and infrared spectroscopy (FTIR). DCP dose below 1% was not sufficient to reach gelation. Over 1%, the gel content increased with increasing DCP dose. The cross-linked BDIS films exhibited enhanced toughness and mechanical properties compared to precursors. Optimal mechanical properties were obtained with concentration of about 5 wt % DCP. At higher doses, the tensile strength and the elongation at break were decreased due to scission reactions.

Influences of Particle Sizes on Properties of Natural Rubber/Waste Ground Rubber Powders Blends

2013 ◽  
Vol 773 ◽  
pp. 668-672
Author(s):  
Jun Liang Liu ◽  
Ping Liu ◽  
Xiao Qiang Tang ◽  
Dong Zeng ◽  
Xing Kai Zhang ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Natural Rubber ◽  
Chemical Activation ◽  
Cross Linking ◽  
Particle Sizes ◽  
Elongation At Break ◽  
Tear Strength ◽  
Rubber Waste ◽  
Ground Rubber

In this paper, the blends of natural rubber with waste ground rubber powders have been prepared by mechano-chemical activation method. The influences of particle sizes on both processing performances and mechanical properties have been investigated. The results indicated that: the blends with waste ground rubber powders of smaller particle sizes approached to higher surface tensile and easily mechano-chemical activation, which led to the formation of complete homogenous re-vulcanization cross-linking structure and resulted in the improvements of the whole performances of the final products. The tensile strength, the elongation at break and tear strength approached to the highest value of 20.7MPa, 530% and 33.0 kN/m as the 100mesh waste ground rubber powders were used as the starting materials.

Study on Mechanical Properties Aging of Spray Pure Polyurea for Hydraulic Concrete Protection

2011 ◽  
Vol 374-377 ◽  
pp. 1325-1329 ◽  
Author(s):  
Wei Bo Huang ◽  
Jia Yu Xiang ◽  
Ping Lv ◽  
Xin Mao Li
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Development Trend ◽  
Elongation At Break ◽  
Tear Strength ◽  
Hydraulic Concrete ◽  
Before And After ◽  
Ultraviolet Ray ◽  
Resistance Performance

Researches of spray pure polyurea technology for hydraulic concrete protection in water conservancy facilities to ensure long term security operation has a great significance. With an emphasis upon mechanical properties and surface morphology of spray pure polyurea coatings comparing before and after aging by means of the artificial accelerated xenon arc lamp(AAXAL) and scanning electron microscope(SEM) in this paper. Besides, the dry-wet circulation resistance performance of coatings wre analyzed through experiment. It is shown that tensile strength, elongation at break and tear strength of coatings increased by 0.2%, 0.5% and 1.7% respectively after AAXAL aging 720h. By contrast, after aging 3000h the results were 22.6%, 3.8% and 17.4% respectively, the tendency of increasing at first and then reducing can be obtained. The mechanical properties reduced slightly for adding defects of coating surface after aging, however, the resistance performance of ultraviolet ray was excellent. The similar development trend of mechanical properties were gained from dry-wet circulation experiment. After aging 200 cycles, the tensile strength and tear strength descended by 4.1% and 1.7% severally but the elongation at break ascended by 5.0%. In a word, it is suggested that the aging of coatings were negligible in dry-wet circulation in short term.

Direct Reactive Compatibilization of GMA on PE/Wood-Flour Composite

2011 ◽  
Vol 378-379 ◽  
pp. 735-739
Author(s):  
Yue Wen Li ◽  
Xin Hua Chen
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Impact Strength ◽  
Flexural Strength ◽  
Wood Flour ◽  
Reactive Extrusion ◽  
Rupture Surface ◽  
Elongation At Break ◽  
Reactive Compatibilization ◽  
Anchoring Strength

Reactive compatibilization between high-density polyethylene(HDPE) and wood-flour was achieved via direct reactive extrusion of glycidyl methacrylate(GMA), initiator, HDPE and wood-flour. Impact rupture surface of the composite was observed by scanning electron microscope(SEM), and its load deformation temperature(HDT) and mechanical properties were tested. Effect of GMA dosage and extrusion temperature on reactive compatibilization of the composite was analysed. The result indicated that the anchoring strength of interface in the composite was obviously strengthened, and its HDT, tensile strength, flexural strength, notched impact strength and elongation at break of the composite were distinctly improved due to the addition of GMA and dicumyl peroxide(DCP). When the composite was extruded at 180°C, the peak values of its HDT, tensile strength, flexural strength, elongation at break and notched impact strength respectively were 84°C, 40Mpa, 45Mpa, 11% and 6.6KJ.m-2, which respectively increased by 17°C, 74%, 36%, 83% and 69% than that of the composite without reactive compatibilization, and when the composite was extruded at 190°C, the peak values of its HDT, tensile strength, flexural strength, elongation at break and notched impact strength respectively were 84°C, 40Mpa, 44Mpa, 11% and 6.6KJ.m-2, which respectively increased by 20°C, 60%, 26%, 83% and 83% than that of the composite without reactive compatibilization. When GMA usage increased, the HDT and mechanical properties of the composite increased first, then descended, and the optimum usage of GMA was 1wt%-3wt%.

Effect of Activated Zinc Oxide on the Property of Sole Rubber

2009 ◽  
Vol 87-88 ◽  
pp. 167-171
Author(s):  
Ti Kun Shan ◽  
Tao Zhuang ◽  
Li Ling Zhou
Keyword(s):  
Tensile Strength ◽  
Zinc Oxide ◽  
Cross Linking ◽  
Shore Hardness ◽  
Elongation At Break ◽  
Tear Strength

The application of activated zinc oxide compared with ordinary zinc oxide in sole rubber was investigated. The experiment showed that activated zinc oxide could improve the microstructure and cross-linking degree of cross-linked rubber, the tensile strength at 100% elongation and at 300% elongation. The ageing resistance increased by 12%. With the amount of activated zinc oxide increased, the modulus at 100% elongation, the modulus at 300% elongation and shore hardness assumed increased, but the elongation at break, tear strength, the ageing resistance presented dropped.

EFFECTS OF GRAFTED VINYL TRIETHOXY SILANE ON MOISTURE CROSSLINKED EPDM

2021 ◽  
Author(s):  
Zhengwei Lin ◽  
Haotian Zhao ◽  
Yanlu Chen ◽  
Jie Mao ◽  
Martin Hoch ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Fourier Transform ◽  
Mechanical Performance ◽  
Weight Ratio ◽  
Dicumyl Peroxide ◽  
Rubber Compound ◽  
Elongation At Break ◽  
Melt Grafting ◽  
Vinyl Triethoxysilane

ABSTRACT An EPDM terpolymer grafted with silane vinyl triethoxysilane (EPDM-g-VTES) was prepared by melt grafting, with dicumyl peroxide (DCP) as an initiator. Next, dibutyl tin dilaurate was added as a catalyst to promote moisture crosslinking of EPDM-g-VTES. By means of the rheological response of the rubber compound, Fourier transform infrared spectroscopy, and moving die rheometer, the VTES graft ratio and DCP partial crosslinking (pre-crosslinking) of EDPM-g-VTES were characterized to show the feasibility of moisture crosslinking. The mechanical properties of moisture crosslinked EPDM-g-VTES specimens were tested by universal material tester. The results showed that when the weight ratio of VTES to DCP was fixed at 15:1, the VTES graft ratio and DCP partial crosslinking of EDPM-g-VTES increased with the increase of VTES content. But the torque in the moisture crosslinking curve of EPDM-g-VTES increased significantly with the extension of crosslinking time, which proved that EPDM grafted with VTES was cured by moisture successfully. The tensile strength and elongation at break of EPDM-g-VTES were improved by moisture cure. Furthermore, the moisture cured specimen with 3 wt% VTES had the best mechanical performance.

scholarly journals The effect of curing on sorption and diffusion of a brake fluid in EPDM elastomer

e-Polymers ◽  
2005 ◽  
Vol 5 (1) ◽  
Author(s):  
Tahereh Darestani Farahani ◽  
Gholam Reza Bakhshandeh
Keyword(s):  
Tensile Strength ◽  
Oxidative Degradation ◽  
Dicumyl Peroxide ◽  
Curing Agent ◽  
Elongation At Break ◽  
Brake Fluid ◽  
Abrasion Loss ◽  
Technical Properties ◽  
And Diffusion

AbstractThe effect of a poly(ether glycol) brake fluid on cured EPDM (ethylenepropylene- diene monomer) elastomer based on 5-ethylidene-2-norborene has been studied. Different amounts of dicumyl peroxide (DCP) curing agent were used and the effect of ageing in a brake fluid (at 100°C for 70 h) on technical properties of EPDM have been investigated. By increasing the amount of DCP, significant changes were not observed. Tensile strength and modulus increased but elongation at break and abrasion loss decreased due to oxidative degradation and crosslinking. Hardness was constant due to the replacement of plasticizer with brake oil.

Eco-friendly synthesis of biodegradable and high strength ternary blend films of PVA/starch/pectin: Mechanical, thermal and biodegradation studies

2020 ◽  
pp. 096739112097288
Author(s):  
Sohan Lal ◽  
Vinod Kumar ◽  
Sanjiv Arora
Keyword(s):  
Thermal Stability ◽  
Tensile Strength ◽  
Tensile Properties ◽  
Food Packaging ◽  
Corn Starch ◽  
Plastic Material ◽  
Ternary Blend ◽  
Cross Linking ◽  
Elongation At Break ◽  
Blend Films

The present study described reduces of plastic based non-biodegradable food packaging material and sustainability toward the environmental protection. The polyvinyl alcohol (PVA) based ternary blend biodegradable films with bio-materials (corn starch and pectin) in ratio 1:5, 1:2, 1:1 and 2:1 were synthesized by solution casting method in water as a solvent to improve the tensile strength, high % elongation at break, and sustained packaging properties. Citric acid and glycerol were used for cross-linking and plasticizing purposes which are also bio-degradable and non-toxic. Blend films were characterized by FTIR and checked out the cross-linking of different components. The dispersion of contents in films was analyzed by SEM images. Thermal stability and degradation behavior of casted films were studied with thermogravimetry and thermal stability increased in blends as compared to neat PVA film. Biodegradability of cast films was also checked by Soil Burial method and bio-degradation increased with time i.e. almost 50% degrades in 30 days and 68% after 90 days. Tensile properties of blend films were tested and found that tensile strength (18.85 MPa) and elongation at break (516%) are high in blend films as compared with neat PVA film (12.04 MPa, 170%). The films are eco-friendly and biodegradable, might be a replacement of plastic material in food packaging having improved tensile properties.

scholarly journals The effect of chemical modifications on rheological properties of collagen from of baltic cod (Gadus morhua) skin stabilized by interaction with κ-carrageenan

2004 ◽  
Vol 22 (SI - Chem. Reactions in Foods V) ◽  
pp. S227-S230
Author(s):  
R. Tylingo ◽  
M. Sadowska
Keyword(s):  
Tensile Strength ◽  
Rheological Properties ◽  
Gadus Morhua ◽  
Cross Linking ◽  
Mechanical Resistance ◽  
Complex Stability ◽  
Chemical Modifications ◽  
Elongation At Break ◽  
Carbodiimide Hydrochloride ◽  
Baltic Cod

The κ-carrageenan-collagen complex was precipitated by κ-carrageenan from solution of collagen sourced from Baltic cod (Gadus morhua) skin in 0.5M acetic acid. The influence of glutaraldehyde or EDC [1-ethyl-3-(3-dimethyl aminopropyl) carbodiimide hydrochloride] concentration on rheological properties of κ-carrageen-collagen complex was examined. At 5 to 30mM glutaraldehyde content in 0.5 κ-carrageenan-collagen dispersion a rapid increase in its viscosity was observed, which remained unchanged over 120 min. Further increase in glutaraldehyde concentration to 30mM caused enhanced viscosity and shorten time of complex stability, which not exceed 45 min. The level of dispersion viscosity caused by glutaraldehyde cross-linking ranged from 70 to 420 mPa·s. For comparison, at EDC concentrations from 30 up to 180mM the viscosity of suspension changed after 200 min from 130–280 mPa·s. Glutaraldehyde not influenced on mechanical resistance of the membranes as well as elongation at the break. However, EDC cross-linking significantly increased the flexibility of the membranes and decreased the stress needed at break. It was observed that at 30 mM concentration of EDC the tensile strength of the membranes was reduced from about 21 MPa to 11 MPa, and the elongation at the break was enhanced from about 0.4 to 20%. At 60mM concentration of EDC the stress at break was reduced to 1.4 MPa, whereas the elongation at break was about 17%. Cross-linking of the membranes decreases their hydrophilic properties.

scholarly journals Experimental study on aging performance of elevator polyurethane buffer

2021 ◽  
Vol 236 ◽  
pp. 01051
Author(s):  
Facai Ren ◽  
Tao Jiang ◽  
Xiao Liang ◽  
Shaoyi Hou
Keyword(s):  
Experimental Study ◽  
Tensile Strength ◽  
Aging Process ◽  
Quality Change ◽  
Elongation At Break ◽  
Hygrothermal Aging ◽  
Hot Environment ◽  
Before And After ◽  
Hardness Change ◽  
Aging Performance

In this paper, the hygrothermal aging experiments of polyurethane buffer materials for elevator were carried out for 5 days, 10 days, 15 days, 20 days, 25 days and 33 days. The quality change, hardness change, tensile strength and elongation at break of the test materials before and after the experiment were compared and analyzed. The results show that the aging process of polyurethane materials is accelerated by the humid and hot environment.

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