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Maleated Polypropylene (maleated + polypropylene)

Distribution by Scientific Domains

Polymers and Materials Science	100%

Selected Abstracts

Comparison of the effects of polyethylenimine and maleated polypropylene coupling agents on the properties of cellulose-reinforced polypropylene composites

JOURNAL OF APPLIED POLYMER SCIENCE, Issue 5 2008
C. González-Sánchez
Abstract The desire to improve the properties of cellulose-reinforced composites while producing them by methods as similar as possible to those used on an industrial scale is one of the driving forces in this field of research. In this work, extensive research for determining the mechanical, thermal, rheological, and physical properties of novel cellulose-reinforced polypropylene composites containing a polyethylenimine (PEI) coupling agent was conducted. A comparison of their properties with those of reference composites without any coupling agent or containing a maleated polypropylene (MAPP) coupling agent was also carried out. The presence of the PEI coupling agent mainly gave rise to a substantial increase in the tensile and flexural strengths and elongations as well as the impact strength, heat deflection temperature (HDT), melt volume flow index, and water absorption of PEI-containing composites in comparison with composites without any coupling agent added. However, the increases achieved in the tensile and flexural composite strengths and HDT were lower than those achieved with the MAPP coupling agent mainly for composites containing 50 wt % cellulose fibers. On the other hand, PEI-containing composites exhibited, in most cases, larger elongations and energies required to break in tensile tests as well as larger impact strengths, melt volume flow indices, and water absorption percentages than MAPP-containing composites. © 2008 Wiley Periodicals, Inc. J Appl Polym Sci, 2008 [source]

Compatibilization of poly(vinyl chloride) with polyamide and with polyolefin by using poly(lauryllactam- random -caprolactam- block -caprolactone)

JOURNAL OF VINYL & ADDITIVE TECHNOLOGY, Issue 3 2005
In Kim
The compatibilization of various poly(vinyl chloride) (PVC) blends was investigated. The blend systems were PVC-polyamide 12 (PA12), PVC-polypropylene (PP), and PVC-ethylene-propylene-diene rubber (EPDM) with a new compatibilizing agent, random-block terpolymer poly(,-lauryllactam- random -,-caprolactam- block -,-caprolactone) or systems containing these copolymers. The results were compared to those obtained in previous studies using poly(,-lauryllactam- block -,-caprolactone) copolymer. The new block copolymer was specially synthesized by reactive extrusion. Observation by scanning electron microscopy (SEM) revealed that compatibilized blends had a finer morphology than the noncompatibilized blends. Addition of 10 weight percent (wt%) of block copolymer proved to be sufficient to give a significant improvement of the mechanical properties of the immiscible PVC blends at room temperature and at high temperatures that were above the glass transition temperature of PVC. For polyolefins, a three-component compatibilizing system including maleated polypropylene, polyamide 12, and block copolymer was used. It was found that poly(,-lauryllactam- random -,-caprolactam- block -,-caprolactone) was the more efficient compatibilizing agent for the modification of PVC-polyamide 12, PVC-polypropylene, and PVC-ethylene-propylene-diene rubber blends. J. VINYL. ADDIT. TECHNOL., 11:95,110, 2005. © 2005 Society of Plastics Engineers [source]

Development of poly(vinyl chloride)/wood composites.

JOURNAL OF VINYL & ADDITIVE TECHNOLOGY, Issue 2 2004
A literature review
Poly(vinyl chloride)/wood fiber (flour) composites are currently experiencing a dramatic increase in use. Most of them are used to produce window/door profiles, decking, railing, and siding by using conical counterrotating intermeshing twin-screw extruders. Heat stabilizers, processing aids, impact modifiers, lubricants, and pigments are still important for PVC/wood composite formulations. Poly[methylene(polyphenyl isocyanate)] (PMPPIC), ,-aminopropyltriethoxysilane, maleated polypropylene (MAPP), and copper metallic complex have proved to be effective coupling agents for this composite system. Mechanical properties of PVC/wood composites can be enhanced by combining wood with mica or glass fibers to form hybrid reinforcements. Ultraviolet light resistance and weathering dimensional stabilities of PVC/wood composites are superior to those of natural wood. Density reduction can be achieved through the microcellular foaming technique by using chemical blowing agents, such as azodicarbonamide and sodium bicarbonate, or physical blowing agents, such as carbon dioxide. J. Vinyl Addit. Technol. 10:59,69, 2004. © 2004 Society of Plastics Engineers. [source]

Effect of maleated polypropylene and impact modifiers on the morphology and mechanical properties of PP/Mica composites

POLYMER COMPOSITES, Issue 6 2006
H. Yazdani
Composites of polypropylene (PP) with mica powder and impact modifiers were produced by internal mixer. A major drawback in the use of mica-filled PP is its low impact resistance. In the present study, the effect of the maleated PP (MAPP) and impact modifiers was evaluated on the composite properties separately and together. Thus, two different styrene-ethylene/butylene-styrene triblock copolymers (SEBS) and one ethylene-propylene-diene terpolymer (EPDM) have been used as impact modifiers in the PP-mica composites. Addition of MAPP had a negative effect on the composite notched impact strength and elongation at break but had a positive effect on tensile strength when used together with impact modifiers. All three elastomers increased the impact strength of the PP-mica composites but the addition of maleated SEBS (SEBS-MA) granted the greatest improvement in impact strength. It was inferred from the scanning electron microscopy that SEBS-MA had a stronger interaction with mica surface than the other impact modifiers. POLYM. COMPOS., 27:614,620, 2006. © 2006 Society of Plastics Engineers [source]

Melt amination of polypropylenes

JOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 18 2005
Q.-W. Lu
Abstract Amine (primary and secondary) functional polypropylenes were prepared by the melt blending of maleated polypropylenes with small diamines, including hexamethylenediamine (primary,primary diamine), p -xylylenediamine (primary,primary diamine), and N -hexylethylenediamine (primary,secondary diamine), at various diamine/anhydride molar ratios in a batch mixer and a twin-screw extruder. The experimental conversion data by Fourier transform infrared nearly agreed with the assumption of a complete reaction between the primary amine and anhydride. Chain extensions of the maleated polypropylenes by the diamines were monitored by the torques during mixing and further evaluated by rheological (dynamic shear rheometry) and mechanical measurements. We show that these amino polypropylenes are very effective adhesion promoters and compatibilizers of thermoplastic polyurethanes with polypropylene. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 4217,4232, 2005 [source]