Polymer Journals

Polymers and Polymer Composites

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Title: NEW GENERATION AMPHOTERIC COMB-LIKE COPOLYMER SUPERPLASTICIZER AND ITS PROPERTIES
Page Range: p.1-8
Author(s): Changwen Miao; Qianping Ran; Jiaping Liu; Yonglin Mao; Yan Shang; Jianfang Sha
File size: 331K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 19
Issue No: No.1

Abstract
The incorporation of high performance superplasticisers in concrete is one of the most effective and economic technological methods for achieving sustainable development in the concrete industry. Conventional polyelectrolytetype superplasticisers have some defects, e.g. poor dispersibility, large slump loss, increasing the shrinkage of concrete and pollution when being manufactured. Although the new generation of comb-like polycarboxylate superplasticisers has remarkable benefits in practice, it also has the shortcoming of low saturation dosage. In this study, based on adsorption-dispersion mechanism of dispersant and polyampholyte solution theory, a new class of amphoteric comb-like copolymer superplasticiser (PACP) was designed and synthesised. The effects of PACP on water reduction, setting, compressive strength, hydration and pore structure were investigated systematically. Results show that PACP can be dosed in small amounts to obtain a water reduction up to 45%. The addition of PACP also does not retard cement hydration and significantly increases the compressive strength of hardened concrete at early and ultimate stages. Moreover, PACP can further improve the rate of heat evolution, delays the time to reach the highest hydration temperature and refines the pore structure of hardened cement paste markedly, leading to decreases of porosity and average pore size. 23 Refs.

Title: EFFECTS OF MWNTS-COOH ON THE COMBUSTION BEHAVIOUR AND THE FLAME RETARDANCY PROPERTIES OF PET
Page Range: p.9-14
Author(s): Jianjun Zhang; Jingzong Zhang; Quan Ji; Liwen Tan; Yanzhi Xia; Qingshan Kong
File size: 269K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 19
Issue No: No.1

Abstract
Novel carboxyl-modified MWNTs-containing PET nanocomposites (PET/MWNTs-COOH) were successfully prepared via an in-situ method. Thermal stability and flame-retardancy properties of PET/MWNTs-COOH nanocomposites were investigated by cone calorimetry (CONE), thermogravimetric analysis (TGA) and scanning electron microscopy (SEM). The CONE calorimetry results showed that PET/MWNTs-COOH had a lower heat release rate (HRR) and total smoke production (TSR), compared with those of pure PET. TGA indicated that the incorporation of MWNTs-COOH increased the char residues and improved the thermal stability of pure PET. SEM images of the char crusts showed that PET/MWNTs-COOH formed more continuous and thicker char residues than those formed with pure PET during combustion. The above results indicated that combustion behaviour and flame retardancy properties of the MWNTs-COOH/PET nanocomposites were sufficiently enhanced that MWNTs-COOH could act as a flame retardancy agent for a PET matrix. Condensed phase and gas phase mechanisms were proposed for the PET/MWNTs-COOH flame-retardancy effect. 20 Refs.

Title: NEAR-INFRARED SPECTROSCOPY AND PRINCIPAL COMPONENTS REGRESSION FOR THE QUALITY ANALYSIS OF GLASS/EPOXY PREPREG
Page Range: p.15-20
Author(s): Wei Li; Wei Jia Gao; Ping Chen; Bao Lei Sun
File size: 358K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 19
Issue No: No.1

Abstract
A near-infrared (NIR) spectroscopic technique associated with a principal components regression (PCR) algorithm has been applied for rapid and nondestructive quality determination of glass/epoxy prepreg. Abundant information of prepreg related with the resin and volatile was observed in the spectra. The raw spectra and first derivative spectra over different spectral ranges were analyzed to obtain the optimum models. The models had correlation coefficients(R) of 0.950 for the volatile content and 0.981 for the resin content. The root mean square errors of prediction (RMSEP) for the volatile content and the resin content were 0.316% and 0.666%, respectively. The NIR spectroscopy method can be used to determine the resin content and the volatile content simultaneously, and the prepreg could be analyzed once within 30 s without sample destruction. 16 Refs.

Title: SYNTHESIS AND CHARACTERIZATION OF POLYIMIDE/SILICA NANOCOMPOSITES WITH COUPLING AGENT
Page Range: p.21-28
Author(s): Shang-Chih Chou; Yao-Yi Cheng; Chi-An Dai
File size: 351K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 19
Issue No: No.1

Abstract
In this study, silica particles were introduced into a polyimide (PI) matrix to enhance its thermal and mechanical properties. Monomers of 3,3',4,4'-biphenyl tetracarboxylic dianhydride (BPDA) and p-phenylenediamine (p-PDA) were employed to synthesize the poly(amic acid) (PAA). Polyimide/SiO2 composites were obtained through a sol-gel process using tetraethoxysilane and multi-step thermal curing processes. The properties of the PI/SiO2 composites with various kinds of coupling agents to enhance the bonding between them were also studied. TGA results indicated that silica particles were dispersed uniformly in the PI matrix at the nano-scale level, as observed in SEM images. The coefficient of thermal expansion was decreased by an increase of the silica content. 33 Refs.

Title: PLASMA TREATMENT AND ITS EFFECTS ON THE TRIBOLOGICAL BEHAVIOUR OF BASALT/EPOXY WOVEN COMPOSITES IN A MARINE ENVIRONMENT
Page Range: p.29-34
Author(s): Kim M H; Rhee K Y; Park S J
File size: 313K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 19
Issue No: No.1

Abstract
Interfacial debonding at the fibre/matrix interface is known to cause the critical fracture of fibre-reinforced polymer composites (FRPs). Especially in a marine environment, the bonding between fibre and matrix is easily weakened by moisture absorption. In this study, a basalt woven fabric was surface-treated by atmospheric oxygen plasma to improve adhesive force at the fibre/matrix interface and its effects on the wear properties of a basalt/epoxy woven composite in a marine environment were investigated. Ball-on-disk wear tests were performed and scanning electron microscopy (SEM) was used to analyze the wear track. The results indicated that oxygen plasma treatment of a basalt fibre reduced moisture diffusion in basalt/epoxy woven composites; while an untreated specimen took 30 days to reach maximum moisture content, similar moisture content was only observed in the oxygen plasma treated specimen after 40 days. In addition, oxygen plasma treatment of a basalt fibre improved the wear properties of the basalt/epoxy woven composite, and the wear volume of the basalt/epoxy woven composite (prior to moisture absorption) was reduced from 2.95 mm3 to 0.65 mm3. The surface treatment also appeared to cause an increase in the interfacial adhesion between the fibre and resin, thus reducing the debonding of basalt fibres on the wear surface. 17 Refs.

Title: PREPARATION OF LOW MOLECULAR WEIGHT POLY(VINYL ALCOHOL)/MONTMORILLONITE COMPOSITE NANOPARTICLES USING AN ELECTROSPRAYING TECHNIQUE
Page Range: p.35-40
Author(s): Sung Min Park; Jae Hyeung Park; Md Shahidul Islam; Jin Hyun Choi; Han Do Ghim; Nam Sik Yoon; Jeong Hyun Yeum
File size: 229K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 19
Issue No: No.1

Abstract
Composite nanoparticles composed of low molecular weight poly(vinyl alcohol) (LMW-PVA) and montmorillonite (MMT) were prepared using the electrospraying technique by regulating PVA solution concentration. Field emission type scanning electron microscopy, transmission electron microscopy, Fourier transform infrared spectroscopy, reflection type X-ray diffraction and thermal gravimetric analysis were utilized to characterize the LMW-PVA/MMT composite nanoparticles morphology and properties. MMT platelets were exfoliated and well distributed within the composite nanoparticles. It was also found that the thermal stability was enhanced by the addition of MMT. 37 Refs.

Title: FAILURE LOAD OF MECHANICALLY FASTENED IMMERSED COMPOSITE LAMINATED PLATES UNDER A PRELOADED MOMENT
Page Range: p.41-46
Author(s): Emre Ciplak; Onur Sayman
File size: 502K
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Journal: Polymers and Polymer Composites
Issue Year: ppc
Volume: 19
Issue No: No.1

Abstract
The effect of water absorption and corrosive sea water on the failure response of an angle ply glass fibre reinforced-epoxy composite oriented as [0/0/90/45]s has been experimentally investigated. The specimens were first tested in unimmersed conditions, and afterwards another group of specimens was immersed in sea water for 200 days. The experiments were performed using some parameters for the pinned and bolted specimens. The specimens were tested under pre-load moments of 3 Nm and 6 Nm. The results point out that the pre-load moments increase the failure load. Moreover, immersion of the composite specimens into the sea water under preload moments can cause a notable decrease of the failure load. 21 Refs.

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