Blends Increases (blend + increase)

Distribution by Scientific Domains
Polymers and Materials Science60%

Selected Abstracts

Hydrogen-bonding interaction between poly(,-caprolactone) and low-molecular-weight amino compounds

POLYMER INTERNATIONAL, Issue 4 2001
Takumi Watanabe
Abstract The specific interactions between several low-molecular-weight diamino compounds and poly(,-caprolactone) (PCL) have been investigated by FT-IR. It was found that PCL and 3,3,-diaminodiphenylmethane (3,3,-DADPM) interact through strong intermolecular hydrogen bonds in the blend. Thermal and mechanical properties of PCL/3,3,-DADPM blends were investigated by DSC and tensile measurements, respectively. The glass transition temperature of the blend increases while both the melting point and the elongation-at-break of the blend decrease with the increase of 3,3,-DADPM content. Besides 3,3,-DADPM, several other low-molecular-weight compounds containing two amino groups, such as o -phenylenediamine or 1,6-diaminohexane, were also added into PCL and the corresponding blend systems were investigated by FT-IR and DSC. The effect of the chemical structure of the additives on the properties of PCL is discussed. © 2001 Society of Chemical Industry [source]

Influence of post-extrusion parameters on the final morphology of polystyrene/high density polyethylene blends

POLYMER ENGINEERING & SCIENCE, Issue 10 2003
H. Padilla-Lopez
The deformation of the dispersed phase in polystyrene/high density polyethylene (PS/HDPE) blends produced by ribbon extrusion was studied numerically and experimentally. A mathematical model for the deformation of the dispersed phase in ribbon extrusion processing of polymer blends was developed assuming uniaxial deformation of the ribbon and the equilibrium shapes of the dispersed particles with a pressure balance over a drop. Simulated morphologies as function of the post-extrusion parameters were obtained and compared with experiments. The analysis of the ribbon extrusion process showed that parameters such as draw ratio (DR) and ribbon-water contact length (X) significantly influence the ribbon dimensions, the extensional stress, and the stretching force. The results also showed that deformation and coalescence of the dispersed phase in the ribbon extrusion processing of polymer blends increase at higher DR and/or lower X values. The comparison between the model and the experimental morphologies of PS/HDPE produced a good agreement. [source]

Improved compatibility of EVOH/LDPE blends by ,-ray irradiation

ADVANCES IN POLYMER TECHNOLOGY, Issue 3 2009
Haihong Li
Abstract The change of compatibility of poly(ethylene- co -vinyl alcohol) (EVOH)/LDPE blends induced by,-ray radiation was studied. Gel extraction experiment results show that the gel fraction of blends increases linearly with the content of LDPE and reaches a maximum at 100 kGy, because neat EVOH is difficult to cross-link by irradiation. A comparison of theoretical and experimental gel contents indicates that some EVOH molecular chains enter the LDPE gel network. The peak at 3363 cm,1 on the Fourier transform infrared spectrum of pure blend gel is assigned to typical stretching of an OH bond, which indicates that a "graft" reaction occurs in the interface between EVOH and LDPE phases during the irradiation process. Mechanical property measurement results support such a structural change. The tensile strength of cross-linked blends increases with absorbed dose first, reaches a maximum value at 150 kGy, and then decreases with dose. A similar trend can also be observed in bending tests. © 2009 Wiley Periodicals, Inc. Adv Polym Techn 28:192,198, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/adv.20160 [source]

Toughening and compatibilization of polyphenylene sulfide/nylon 66 blends with SEBS and maleic anhydride grafted SEBS triblock copolymers

JOURNAL OF APPLIED POLYMER SCIENCE, Issue 4 2007
Weihua Tang
Abstract In this study, styrene- b -ethylene/butylene- b -styrene triblock copolymer (SEBS) and maleic anhydride grafted SEBS (SEBS- g -MA) were used as compatibilizers for the blends of polyphenylene sulfide/nylon 66 (PPS/PA66). The mechanical properties, including impact and tensile properties and morphology of the blends, were investigated by mechanical properties measurements and scanning electron microscopy. Impact measurements indicated that the impact strength of the blends increases slowly with elastomer (SEBS and SEBS- g -MA) content upto 20 wt %; thereafter, it increases sharply with increasing elastomer content. The impact energy of the elastomer-compatibilized PPS/PA66 blends exceeded that of pure nylon 66, implying that the nylon 66 can be further toughened by the incorporation of brittle PPS minor phase in the presence of SEBS or SEBS- g -MA. The compatibilization efficiency of SEBS- g -MA for nylon-rich PPS/PA66 was found to be higher than SEBS due to the in situ forming SEBS interphase between PPS and nylon 66. The correlation between the impact property and morphology of the SEBS- g -MA compatibilized PPS/PA66 blends is discussed. The excellent impact strength of the nylon-rich blends resulted from shield yielding of the matrix. © 2007 Wiley Periodicals, Inc. J Appl Polym Sci, 2007 [source]