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2014, Volume 28 Issue 11 Publication date: 26 November 2014 Previous Issue Next Issue

Research Progress in Natural Vegetable Fibre Reinforced PP Composites

2014, 28 (11): 1-6 ; DOI: 10.19491/j.issn.1001-9278.2014.11.001

Abstract ( 508 )

The variety and quality of natural vegetable fibers(NVF) were introduced. The methods for improvement of compatibility between NVF and PP matrix were summarized, including physical methods and chemical methods.The progress in natural vegetable fiber reinforced PP composites in recent years was reviewed. The trend of the research on PP/NVF composites was proposed.

Research Progress of Polyaniline Composites

2014, 28 (11): 7-11 ; DOI: 10.19491/j.issn.1001-9278.2014.11.002

Abstract ( 449 )

Polyaniline composite have potential applications in many fields due to their unique electromagnetic, thermodynamic and mechanical properties. The latest progresses of researches on the modifications of polyaniline was reviewed. Applications of the composites included electrodes in supercapacitors, sensors, and wave-absorbing materials. The future trend of the polyaniline composites was prospected.

Development Situation of Polyimide Film in China

2014, 28 (11): 12-19 ; DOI: 10.19491/j.issn.1001-9278.2014.11.003

Abstract ( 666 )

This paper introduces the domestic industrial development course of the polyimide film from manufacturing technology, market distribution and product quality and concludes the production capacity, characteristics, planning of major manufactures. At the same time, it points out the existing problems of the domestic polyimide film development and the technology trends as well.

Study of Oil/Heat Resistance Mechanism of Rubber-plastic Blends from SEM and XPS Analyses

2014, 28 (11): 20-24 ; DOI: 10.19491/j.issn.1001-9278.2014.11.004

Abstract ( 391 )

Rubber-plastic blends were prepared from methyl vinyl silicone rubber(MVQ) and ethylene-vinyl acetate copolymer(EVA28,VA content 28%). They were superior to neat MVQ in tensile strength and elongation at break and also have good oil/heat resistance. The changes of the morphology and the element compositions as well as their chemical state before and after the oil/heat resistance were characterized by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The oil/heat resistant mechanism of the blends was analyzed. XPS showed that C element increased while O and Si element decreased on the surface on resistance due to the high oil absorption expansion rate of EVA component. C element decreased while Si and O element increased on the surface on heat resistance test for the migration of SiO2 to the surface.

Preparation and performance of Silver-coated Fe3O4 with PANI Composites

2014, 28 (11): 25-29 ; DOI: 10.19491/j.issn.1001-9278.2014.11.005

Abstract ( 470 )

A layer of elemental silver was electrodless plating coated on the surface of Fe3O4 forming Ag/Fe3O4. Subsequently, conductive polymer magnetic composites(PANI/Ag/Fe3O4) was prepared through in situ polymerization of PANI.When the amount of Ag/Fe3O4 was 20% of the mass of PANI,the conductivity of PANI/Ag/Fe3O4 composites was 0.85 S/cm and saturation magnetization was 16.34 emu/g.Ag/Fe3O4 hindered the decomposition of PANI and thus high decomposition temperature and thermal stability was obtained.

Effect of Composite Fillers of Talc and ZnO Pillared Organic Saponite on Crystallization and Properties of PLA

2014, 28 (11): 30-36 ; DOI: 10.19491/j.issn.1001-9278.2014.11.006

Abstract ( 413 )

PLA based nanocomposites was prepared by solution intercalation with modified talc and ZnO pillared organic saponite. X-ray diffraction (XRD) and scanning electron microscope (SEM) analysis suggested that the interlamellar spacing of talc was increased and the surface of talc was coated by KH570. Moreover, the mechanical properties testing showed that when the addition of ZnO pillared organic saponite was 0.3 phr, the tensile strength of PLA based nanocomposites attained 40.3MPa, which was increased by 140.9% compared with that of PLA matrix.Differential scanning calorimetry results displayed that modified talc and ZnO pillared organic saponite performed a hererogeneous nucleation effect and enhanced the crystallinity of PLA matrix, which was in accordance with XRD analysis, and the decomposition temperature of PLA based nanocomposites was increased by 7.07oC compared with that of PLA matrix.

Preparation and Properties of Thermally Conductive PA6/BN/MgO Composites

2014, 28 (11): 37-41 ; DOI: 10.19491/j.issn.1001-9278.2014.11.007

Abstract ( 494 )

Thermally conductive composites were prepared with the polyamide 6（PA6）as matrix and hexagonal boron nitride（BN）and magnesium oxide（MgO）as fillers.Keeping the dosage of fillers at 50%, the effect of weight ratio of MgO to BN, thermal conductivity（λ）, mechanical properties, melt flow rate was studied. With increasing weight ratio of MgO to BN，thermal conductivity，tensile strength, and blending strength of the composites increased，while the impact strength and elongation at breaking decreased. Besides, the melt flow rate increased first, and then reduced.

Mechanical and Flame Retardant Properties of PEEK/MWCNT Composites

2014, 28 (11): 42-46 ; DOI: 10.19491/j.issn.1001-9278.2014.11.008

Abstract ( 441 )

Poly( ether ether ketone) (PEEK) and multi-walled carbon nanotubes（MWCNT）were mixed via melt blending leading to composites. The effect of MWCNT on the properties of PEEK was analyzed. It showed that a certain amount of MWCNT could improve the mechanical and flame retardant properties of PEEK. When 5%(mass content)of MWCNT was added,the flexural strength increased by 53%. When the mass content of MWCNT was 1% (mass content), the composites had minimum peak heat release rate and maximum cone calorimetry combustion index value. Thermogravimetric analysis showed that the initial decomposition temperature was increased about 13 ℃, which indicates that MWCNT effectively improve the flame retardant and thermal stability of PEEK.

Preparation and Aging Resistance of PP/PP-g-AN/nano-TiO₂

2014, 28 (11): 47-51 ; DOI: 10.19491/j.issn.1001-9278.2014.11.009

Abstract ( 408 )

PP-g-AN and TiO2 were introduced into polypropylene in order to improve its aging resistance.The aging of the system was monitored for 500, 1000, 1500, 2000 and 2500h. When the PP-g-AN/TiO2 content was 590/5/5, the tensile strength of modified polypropylene reached a maximum of 25.58MPa and an impact strength of 62.73 KJ/m2 after accelerated aging 2500h.

Synthesis and Application of Cyclotriphosphazene Derivative in PET

2014, 28 (11): 52-56 ; DOI: 10.19491/j.issn.1001-9278.2014.11.010

Abstract ( 398 )

A novel flame retardant composed of hexachlorocyclotriphosphazene (HCCP) modified by silicon and boron moieties (HCCP-Si-B) was used as flame retardant for PET. The chemical structure of HCCP-Si-B was characterized by FTIR and NMR. The flame retardancy of PET was investigated by limited oxygen index and vertical burning test. SEM was used to investigate the morphology of the char residue. It showed that HCCP-Si-B had excellent flame retardant property,the sample achieved UL 94 V-0 rating and the limited oxygen index value more than 30% while the content of HCCP-Si-B was only 1%. The coat-like char formed in the outer char surface of composites and many micro porous cells in inner surface. Such a structure provided a barrier for the PET material during burning.

Grafting PAAM from Surface of PP/EPDM Blend Sheet via UV Irradiation

2014, 28 (11): 57-61 ; DOI: 10.19491/j.issn.1001-9278.2014.11.011

Abstract ( 393 )

The surface of PP/EPDM blend sheet was grafted by polyacrylamide (PAAM) via UV Irradiation. The surface composition of the grafted blend sheet was characterized by Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy（XPS, contact angle, and scanning electron microscopy (SEM). The effects of the content of EPDM, radiation time, monomer, and initiator on grafting and properties were discussed.When the content of EPDM was 20%, the mass of graft per unit area was 0.75 mg/cm^2 and the water contact angle was reduced from 102.5o to 72.5o, the surface tension was increased from 16.6 mN/m to 48.7 mN/m.

Research of the Gas Phase Copolymerization of Ethylene and Propylene

2014, 28 (11): 62-66 ; DOI: 10.19491/j.issn.1001-9278.2014.11.012

Abstract ( 578 )

The content of the hexane-soluble part in the copolymers and the thermal properties of copolymers were measured by differential scanning calorimeter, the ethylene content in the copolymers was measured by 13C-NMR, the composition of the copolymers was analyzed by Fourier infrared spectrometer. It showed that the hexane-soluble part of the copolymer was obviously effected by the reaction pressure and reaction temperature, the thermodynamic properties and the content of ethylene in the copolymers were greatly influenced by monomer proportion, but were not obviously influenced by the temperature and pressure. The ethylene content in the hexane-soluble part was higher than hexane-insoluble part.

Test Analysis of Tensile Mechanical Properties and Failure Mode of GFRP Bars

2014, 28 (11): 67-72 ; DOI: 10.19491/j.issn.1001-9278.2014.11.013

Abstract ( 416 )

Tensile mechanical properties and failure mode of GFRP bars was different from common engineering materials. By one-time tensile and cyclic tensile test on GFRP thread bars with different sizes and fiber content conditions, the relationship between apparent characteristics and the stress was observed, and stress-strain behavior of GFRP bars on the locations of 1/2 and 1/4 length was compared and analysed.It was found that cracks emerged near the sleeves when the stresses of GFRP bars reached a certain value, and developed to the central of bars with increasing stress. The cracks closed gradually as the stress decreasing before the failure of bars. Before failure, the cracks develop longitudinally and became jagged in shape.Failure property is between brittle and plastic failures.Strength analysis shows that GFRP bars with diameters of 20 and 25 mm had the maximum utilization efficiency.

Preparation and Performance Research of Urea Formaldehyde Coated Epoxy Resin Microcapsules

2014, 28 (11): 73-77 ; DOI: 10.19491/j.issn.1001-9278.2014.11.014

Abstract ( 630 )

Urea formaldehyde coated epoxy resin microcapsule was prepared.The effects of weight ration of core/shell materials and preparation condition on the performance of microcapsule were investigated.The healing process of microcapsule for epoxy resin matrix was studied.When the synthesis temperature of urea formaldehyde was 70oC and weight ratio of epoxy resin over benzyl alcohol was 10:3,weight ratio of core/shell materials was 0.8, and the amount of emulsifier was 5%~7%, the dispersing stirring speed was 500r/min,the obtained EP-UF microcapsule had an average particle size of 55μm with a good airtight property and high strength.When a higher coating ratio and a more flexible core was used, the microcapsule may reach higher tensile strength and higher healing rate.

Study on Corona Treatment of IXPE Foam

2014, 28 (11): 78-81 ; DOI: 10.19491/j.issn.1001-9278.2014.11.015

Abstract ( 617 )

Improving surface tension of radiation crosslinked polyethylene (IXPE) foam by corona treatment be introduced .The main influence factors on surface tension such as ratio of materials, power and speed of corona treatment, product thickness, temperature, etc, have been studied.It has been observed that surface tension increase along with ratios; stronger power,slower speed, and higher temperature can improve the corona treatment results;the reduction of surface tension after corona treatment depends on storage condition of the materials.The material with surface tension reaching 38mN/m can maintain for a week,but it can be easily corona treated secondly.

Preparation of Epoxy Fatty Acid Methyl Ester Plasticizer for PVC From Illegal Cooking Oil

2014, 28 (11): 82-87 ; DOI: 10.19491/j.issn.1001-9278.2014.11.016

Abstract ( 426 )

The illegal cooking oil was processed through esterification,followed by acid-catalyzed epoxidizing,and the product,epoxy fatty methyl ester,was used as a plasticizer of PVC.The structure of the product and the raw material was determined. A weak absorption peak at 839.2cm-1 was observed on FTIR Spectroscopy, which indicated the generation of epoxy groups. The composition of illegal cooking oil determined by GC-MS revealed that the content of unsaturated fatty methyl ester was decreased obviously whilst the epoxy fatty methyl ester was increased slowly with increasing epoxidizing time.After 8h of epoxidizing ,an epoxid value of 3.9% was observed and the iodine value decreased from 87.7 to 8.7.The epoxy fatty methyl ester had a high flashing point (197℃)and showed similar plasticizing efficiency as DOP. A 50wt% ester could decrease the glass transition temperature of PVC from 87℃ to -10℃.The migration resistance of epoxy fatty methyl ester was inferior to DOP.

Preparation and Application Performance of Environmental-friendly Plasticizer-epoxidized Cardanol Acetate for PVC

2014, 28 (11): 88-94 ; DOI: 10.19491/j.issn.1001-9278.2014.11.017

Abstract ( 558 )

Cardanol acetate (CA) was synthesized by the reaction of bio-based cardanol with acetic anhydride using toluene sulfonic as a catalyst. Sunsequently,CA was reacted with hydrogen peroxide with formic acid as a catalyst forming epoxidized CA (ECA)which was used as a plasticizer for PVC. The effect of ECA content on the TGA curves, Shore A hardness, glass transition temperature, tensile strength and elongation at break of plasticized PVC was studied.With the amount of ECA increased from 20 to 90 phr, the thermal stability of PVC and elongation at break increased obviously,however, the Shore A hardness, glass transition temperature, and tensile strength decreased. Compared with neat and DOP plasticized PVC,the synthesized ECA showed better plasticizing performance. Moreover, FTIR showed that ECA had a good compatibility with PVC.

Mechanical Properties of Recycled Nature Fibers Reinforced High-density Polyethylene Composites

2014, 28 (11): 95-99 ; DOI: 10.19491/j.issn.1001-9278.2014.11.018

Abstract ( 347 )

PE-HD/nature fiber composites were prepared by a twin-screw extruder. Two kinds of recycled post-consumer nature fibers, ramie noil fiber and bamboo residue were used and compared. The effect of fiber contents and fiber types on the melt index, microstructure, and mechanical properties of the composite were studied. Both kinds of fibers could improve mechanical properties of the composite. Compared with bamboo residue, ramie noil fiber played a more effective role on the composites. When 20% ramie noil fiber was used, the tensile strength is increased by 21% and the flexural strength increased by 48%.

Trunk Lid Design of Rotary Molding Cars

2014, 28 (11): 100-103 ; DOI: 10.19491/j.issn.1001-9278.2014.11.019

Abstract ( 457 )

This paper mainly described the design process of car plastic trunk lid. In order to meet the needs of automotive lightweight, high-molecular materials are used to replace original metal stamping parts, ensuring the trunk lid features an ergonomic base. Meanwhile, plastic trunk lid molding process was optimized to meet the demand for rotary molding, including stress calculation and optimized design of metal inserts .

Optimization Design of Single-screw Extrusion Mechanism on the Solid Conveying Section

2014, 28 (11): 104-107 ; DOI: 10.19491/j.issn.1001-9278.2014.11.021

Abstract ( 485 )

Based on orthogonal experiment and Matlab the solid conveying section of the single screw extruder was multiple target numerical simulated,the influence of geometrical parameter of the screw on the efficiency and rate of solid convey section and the optimal combination of screw parameters were obtained. The simulation result had a high reliability, with which the design cycle of screw can be shortened,and the costs of research and development can be reduced.