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2011, Volume 25 Issue 05 Publication date: 26 May 2011 Previous Issue Next Issue

China Plastics Industry(2010)

LIAO Zhengpin

2011, 25 (05): 1-10; DOI: 10.19491/j.issn.1001-9278.2011.05.002

Abstract ( 155 )

Research Progress on the Preparation and Conductive Properties of Epoxy/Carbon Nanotubes Composites

LI Hong-Yan

2011, 25 (05): 11-16 ; DOI: 10.19491/j.issn.1001-9278.2011.05.003

Abstract ( 2181 )

The preparation methods of epoxy/carbon nanotubes composites were introduced, including solution casting，in-situ polymerization，chemistry modification, mixed-curing agent assisted laying out, and resin transferring molding. The dispersion of carbon nanotubes in epoxy matrix was discussed. The recent development of conductive epoxy/carbon nanotubes composites at home and abroad were summarized and the factors effecting the conductive properties of the composites were analyzed, including the aspect ratio，surface modification, shear rate，and curing condition of the composites.

Surface Modification and Characterization of PEEK

SUN Hui

2011, 25 (05): 17-23 ; DOI: 10.19491/j.issn.1001-9278.2011.05.004

Abstract ( 2709 )

Some features and applications of poly (ether ether ketone) were briefly introduced. Several recent surface modification methods for PEEK films were reviewed, including plasma treatment, ultraviolet irradiation, and wet chemistry. In addition, several major surface characterization methods such as scanning electron microscope (SEM), X-ray photoelectron spectroscopy (XPS) and atomic force microscope (AFM) were described.

Light Degradation and Light Stabilization of Wood-plastic Composites

LUO Hai

2011, 25 (05): 24-29 ; DOI: 10.19491/j.issn.1001-9278.2011.05.005

Abstract ( 2212 )

The development situation of the wood-plastic composites(WPC) was introduced. The light degradation mechanism of WPC was discussed. In order to ensure the light stability of WPC, the nature and properties of both the wood and plastics must be considered. The possible way for stabilization of WPC were also discussed, and the future development of WPC in China and the world were forecast.

Reactive Compatibilization of EAA in PE-HD/ LDH Composites

2011, 25 (05): 30-34 ; DOI: 10.19491/j.issn.1001-9278.2011.05.006

Abstract ( 2064 )

EAA/LDH masterbatch and PE-HD/LDH composites were prepared by melt blending; the interaction between EAA and LDH, and the compatibilization of EAA in the composites were studied. It showed that EAA had released the original interlayer exchangeable carbonate anions of the LDH, and reacted with LDH forming carboxylic acid-metal ionic bond. EAA partially destroyed the long-range order in LDH and thus weakened its diffraction peaks. EAA acted as an effective compatibilizer for the composite, enhanced the interfacial adhesion between LDH and PE-HD obviously, promoted the dispersion of LDH in the matrix; The mechanical properties measurements showed the mechanical properties of the composites containing EAA were better than those without EAA, both tensile strength and toughness of the composites increased simultaneously.

Preparation of Fluorene-containing Cross-linkable Poly(arylene ether ketone)s

2011, 25 (05): 35-38 ; DOI: 10.19491/j.issn.1001-9278.2011.05.008

Abstract ( 2009 )

A series of fluorene-containing cross-linkable poly(arylene ether ketone)s (PAEKs) with pendant propenyl group was synthesized by copolymerization from 9,9-bis(4-hydroxyphenyl)fluorene, diallyl bisphenol-A, and 4,4'-difluorobenzophenone via the gradual addition reaction of nucleophilic substitution. FTIR, NMR, DSC, and TG were emloyed to characterized the structure, thermal cross-linking reaction, and the thermal stability of the polymers. It showed that the cross-linking reaction occurred under heating, with the gel content reaching to 97.5 %. After cross-linking, the thermal stability and solvent resistance of the polymer were increased.

Study on the Properties of Poly(lactic acid)/Ethylene Vinyl Acetate / Calcium Carbonate Composites

Yang Gang Yang DOU Qiang

2011, 25 (05): 39-45 ; DOI: 10.19491/j.issn.1001-9278.2011.05.009

Abstract ( 2278 )

Poly (lactic acid) (PLA)/ethylene vinyl acetate(EVA)/CaCO3 composites were prepared via melt blending using a twin screw extruder. The effect of CaCO3 and EVA on crystallization, fracture surface, mechanical properties, and heat resistance of the composite were investigated by means of DSC, XRD, PLM, SEM, mechanical property and HDT tests. The toughness of the composite was increased, but the stiffness and heat resistance were decreased by the addition of EVA. While the stiffness, toughness, crystallization rate, and heat resistance were increased by the addition of CaCO3. A synergistic effect was observed in the combination of CaCO3 and EVA. No changes of crystal forms was found in the composites. The optimum comprehensive properties were achieved in case of the composite containing 10 wt % CaCO3 while PLA/EVA=90/10.

Study on the Thermal Oxidation of Wood-plastic Composites

ZHANG Qingfeng

2011, 25 (05): 46-50 ; DOI: 10.19491/j.issn.1001-9278.2011.05.010

Abstract ( 2183 )

Wood-plastic composites(WPC) were prepared from polypropylene（PP）and wood flour. Thermal properties and oxidation induction time (OIT) of the WPC, PP, and wood flour were studied using differential scanning calorimetry (DSC) and thermogravimetric (TG). The effects of wood flour and antioxidant on OIT of WPC were investigated. No significant oxidation was observed in PP or WPC containing antioxidant 1010. An exothermic peak in DSC curve and a rapid weight loss on TG curve were found after exhausting antioxidant 1010 (after OIT), which means an obvious thermal oxidation decomposition of PP or WPC. The antioxidant had little effect on the thermal stability of wood flour. The thermal stability of WPC was improved obviously by adding antioxidant dilauryl thiodipropionate (DLTP).

Synthesis and Properties of PBS with Star-shaped Structure

2011, 25 (05): 51-54 ; DOI: 10.19491/j.issn.1001-9278.2011.05.011

Abstract ( 1955 )

Three arm star-shaped poly (butylene succinate) (s-PBS) was synthesized by melt polycondensation from 1,4-succinate, butanediol, and glycerin, with titanic acid ester as chief catalyst and acetate as assistant catalyst. The property of s-PBS was characterized using FTIR, DSC, GPC,TGA, and POM. The number average molecular weight was found to be 7.32×104, the degree of crystallinity was 76 %, the melting temperature was 115.4 ℃. After biodegradation in compost for 60 days, the biodegradation percentage of s-PBS reached to 54.16 %.

Study on Wet Extrusion Process and Mechanical Property of ABS Resin

2011, 25 (05): 55-59 ; DOI: 10.19491/j.issn.1001-9278.2011.05.012

Abstract ( 2280 )

In this paper, wet extrusion process was used to prepare ABS resin. Firstly, ABS graft copolymer wet powder was synthesized by emulsion polymerization, and then filtering, dewatering. Secondly, the ABS graft copolymer wet powder was blended with SAN resin and then extruded in wet extruder, getting the ABS resin. The effects of moisture, rubber content, antioxidant content, and extrusion temperature and screw rotating speed on mechanical properties of ABS resin were studied. It was found that a too high extrusion temperature caused the degradation of the resin, the impact and tensile strengths decreased with increasing extrusion temperature. The moisture content had little effect on the mechanical property of ABS resin. TEM showed that rubber particles dispersed in the SAN matrix uniformly. The optimum parameters in the processing were extrusion temperature 180 °C, screw rotating speed 200 r/min, and antioxidant content 0.154 wt %.

Influencing Factors Analysis on Permeability of PET Package Films

Guo Yan-feng

2011, 25 (05): 60-64 ; DOI: 10.19491/j.issn.1001-9278.2011.05.013

Abstract ( 2621 )

The influence of temperature, relative humidity, and film thickness on the permeability of PET packaging films was investigated. Based on the gas molecular osmotic reaction kinetics, empirical equations for permeating rates of water vapor, O2, and CO2 were formulated through regression analysis method. With the increasing of ambient temperature, the permeating rate of H2O, O2, and CO2 through PET film and PET/Al film increased. The logarithm of permeating rate of H2O,, and CO2 was linearly related to the reciprocal temperature. In the 12 ?m-thick PET film, the permeating rate of water vapor was independent, in the 20 ?m-thick PET film and 18 ?m-thick PET/Al film, that was weakly dependent of humidity. PET film had prominent perm-selectivity for O2 and CO2, with the permeating rate of CO2 being twice that of O2. The permeating rates of O2 and CO2 in PET/Al film were comparable, both lower than those in PET film.

Effect of Modified AC Foaming Agent

2011, 25 (05): 65-69 ; DOI: 10.19491/j.issn.1001-9278.2011.05.014

Abstract ( 1983 )

Performance of homemade modified azodicarbonamide(AC) foaming agent in PVC/wood composites was studied using differential scanning calorimeter. It was shown that the decomposition temperature of modified AC foaming agent was in the range from 165 ℃ to 187 ℃. Compared with the traditional AC foaming agent, the decomposition temperature was reduced by 40 ℃ and peak exothermic was also reduced about 39.5 ％. The average gas evolution of modified AC was 189 mL/mg .When 1.2 phr modified AC foaming agent was used, fine and uniform pores were obtained, which was witnessed by scanning electron microscope (SEM) micrographs. Compared with un-foamed PVC/wood composites, the impact strength of foamed composites increased by 34.6 % and apparent density decreased by 22.5 %

Study of Glyzinc and its compound stabilitizer on Photostabilization of PVC

2011, 25 (05): 70-72 ; DOI: 10.19491/j.issn.1001-9278.2011.05.015

Abstract ( 2010 )

Glyzinc was used as a light stabilizer of PVC, and its effect on the after aging mechanical properties and color of PVC was investigated. It showed that the photostabilization of glyzinc on PVC was excellent, a synergistic effect of glyzinc with Tinuvin770 was observed. When the weight ratio of glyzinc to Tinuvin770 was 2:3, the photostabilization was the best.

Study on the Preparation of Bamboo Charcoal/ Water-borne Polyurethane Antistatic Coating

Yang Lei

2011, 25 (05): 73-78 ; DOI: 10.19491/j.issn.1001-9278.2011.05.016

Abstract ( 2058 )

Water-borne polyurethane(WPU) was filled with bamboo charcoal (BC) forming antistatic paint film. The effect of BC loading, BC modifier, BC granularity, and mixing time on the properties of the film was investigated. γ-APTES was found a good modifier for BC. When the content of γ-APTES was 2 wt% of BC, BC content was 20 phr, BC granularity was 25?m, and mixing time was 40 min, the obtained WPU/BC film a volume resistivity of 1.7×104 Ω·cm, a pencil hardness of 4H, an impact strength of 73 kg.cm, a washability of 11350 times.

Experimental Study on Flexural Behavior of Post-tensioned Method Unbonded Prestressed Concrete Beams Reinforced with BFRP Tendons

Fei Wei

2011, 25 (05): 79-84 ; DOI: 10.19491/j.issn.1001-9278.2011.05.017

Abstract ( 2132 )

BFRP tendon reinforced un-bonded full post-tensioned and partially post-tensioned concrete beams were prepared, the differences in the flexural behaviors of the concrete beams was studied with non-pre-stressed bars as references. The influence of reinforcement ratios of non-pre-stressed steel bars on the flexural behavior of un-bonded partially post-tensioned concrete beams was analyzed. It showed that, the cracking resistance, crack widths, and deflections of concrete beams were greatly improved by BFRP tendons, resulting in better serviceability. The ductility of partially post-tensioned concrete beams was better than that of full post-tensioned beams, and the yield loads and ultimate loads was enhanced as the reinforcement ratios of non-pre-stressed steel bars increased, whereas the crack intervals and ultimate crack widths was decreased.

Synthesis and Properties of Phosphonite-containing Epoxy Resin

2011, 25 (05): 85-89 ; DOI: 10.19491/j.issn.1001-9278.2011.05.018

Abstract ( 1926 )

A novel epoxy resin containing phosphonite was synthesized. First, dichloromethyl phosphine was reacted with bisphenol A to form phosphonite-containing bisphenol A, which was further reacted with epichlorohydrin to obtain phosphonite-containing epoxy resin. The structure of the product was characterized with FTIR and gel permeation chromatography (GPC). The epoxy value and phosphorus content were measured using HCl-acetone titration and molybdenum blue method. The thermal stability, flame retardant, and mechanical properties of cured epoxy resin were also investigated. It was foumd that number-average molecular weight (Mn, GPC), weight-average molecular weights (Mw, GPC) were 387, 404 g/mol , respectively. Epoxy value and phosphorus content were 0.437 and 4.3 wt %, respectively. The cured epoxy resin exhibited good thermal stability and flame retardancyt with limit oxygen index of 38 %. The tensile strength, tensile modulus, elongation at break, and impact strength of cured epoxy resin were 25 MPa, 975 MPa, 5.3 %, and 24.8 kJ/m2, respectively.

Synthesis and Application of a New Non-toxic PVC Heat Stabilizer Penzinc

2011, 25 (05): 90-95 ; DOI: 10.19491/j.issn.1001-9278.2011.05.019

Abstract ( 2201 )

Penzinc was synthesized by a solid-state reaction. The structure of the complex was confirmed by infrared spectroscopy and X-ray diffraction. Thermal stability of penzinc and with several auxiliary heat stabilizers, calcium stearate, epoxidized soybean oil, LDHS and β-diketone were evaluated by Congo Red test and oven aging test. It showed that penzinc and epoxidized soybean oil had the best collaborative effect，the thermal stability time could reach 54 min. Penzinc and β-diketone had better collaborative effect on inhibition of the early color changing. Penzinc obviously enhanced the heat stability of PVC, no zinc burning phenomenon was found, closes to the traditional lead salt.

The Research of ABS Resin Modified by Recycle PC

LAI Jin-Ya Bian-Ying WEN

2011, 25 (05): 96-100 ; DOI: 10.19491/j.issn.1001-9278.2011.05.020

Abstract ( 1996 )

ABS/PC alloy was prepared with fresh ABS resin and recycled PC resin from waste CD via melt blending. The influence of the content of recycle PC on the mechanical properties of the alloy was discussed. Two compatibilizers, MBS and POE-g-GMA were used to improve the interfacial adhesion of the alloy. It showed that the tensile strength of ABS/PC alloy increased with increasing content of recycle PC . The impact strength of ABS/PC alloy increased first and then decreased, with the highest impact strength at the content of recycled PC of 10 wt %. The alloy was better toughened with MBS than with POE-g-GMA. When the content of recycled PC was 5 %，the impact strength of ABS/PC/MBS alloy increased 42.8 % compared with that of neat ABS.

Research on the Materials and Properties of Melamine Tableware

2011, 25 (05): 101-104 ; DOI: 10.19491/j.issn.1001-9278.2011.05.021

Abstract ( 1964 )

Structure and thermal stability, humidity resistance, stain resistance, and migration of formaldehyde of several tableware-resins, melamine，urea-formaldehyde, and melamine/urea-formaldehyde blends were investigated. It was found that the performance of the molding articles from melamine was much better than those from urea-formaldehyde and melamine/urea-formaldehyde blends, and melamine-coated urea-formaldehyde molding articles.

Study on Energy Distribution of Plastic Injection Molding Process Based on LabVIEW

2011, 25 (05): 105-110 ; DOI: 10.19491/j.issn.1001-9278.2011.05.022

Abstract ( 1844 )

Based on the graphical programming language of LabVIEW, an energy consumption detection system for injection molding machine was developed, which could make on-line detection for the energy consumption of the hydraulic system in the injection molding machine. With on-line integral method, the whole energy consumption of the machine and the energy distribution of different processes stage in an injection molding cycle could be detected. An experimental study on energy distribution by this system was carried out in order to find the influence between the key process parameter and the energy distribution. It was found that the major stage in this energy distribution was injection process. The major effect of injection pressure on energy consumption was in the stage of injection energy consumption, but the major effect of screw rotational speed on energy consumption was in the stage of plasticization energy consumption.