Dissertation > Excellent graduate degree dissertation topics show

Preparation and Characterization of in Situ Compatibilized PA6/POE Blends

Author: WangZuo
Tutor: WangBiaoBing
School: University of North
Course: Materials Science
Keywords: PA6/POE blend Morphology structure Rheological behavior Crystallization kinetics
CLC: TQ323.6
Type: Master's thesis
Year: 2009
Downloads: 198
Quote: 6
Read: Download Dissertation

Abstract


Polyamide 6 (nylon 6) is one of the most used thermoplastic due to its easy processing, wear resistance, and high melting temperature. The broader application of PA 6, however, is limited by its brittleness and high water absorption.In order to improve its toughness, PA6/POE composites were prepared by in-situ compatibilization technology in the present of L101 and MAH, and the mechanical properties, morphology structure, rheological behavior and crystallization properties were investigated by tensile/impact strength testing, scanning electron microscopy (SEM), capillary rheometer, differential scanning calorimeter (DSC) and polarizing microscopy (POM).The experimental results demonstrated that the toughness of PA 6 were improved significantly by in-situ compatibilization technology. When the composition PA 6/POE/L101/MAH was 70/30/0.12/1, it gave 65.2KJ/m2 of impact strength, which was increased by 14.5 times as compared to that of neat PA6 (4.5KJ/m2). SEM analysis showed that the POE dispersed uniformly in PA6 matrix in the form of smaller dimension, which played a key role in the improvement of the toughness.The rheological behavior of PA6/POE composites with various L101 content was investigated. The results showed that PA6/POE composites were pseudo-plasitc. In the case of constant shear stress and shear rate, the apparent viscosity increased with the increase of the L101 concentration, and gave the maximum value in the case of 0.12 % L101 loading. The apparent viscous activation energy of the blends tended to decrease with the increasing L101 concentration, it was indicated that the blend displayed slight processing temperature-sensitivity.The crystallization kinetics of PA6/POE blends with various L101 concentration was investigated by DSC. As demonstrated by the analysis of the isothermal crystallization kinetics, Avrami equation can describe isothermal crystallization of PA6 and its blends very well. The interaction between PA 6 and POE was improved by the in-situ formation of POE-g-MAH during the extrusion process. Such strong interaction restricted the chain mobility of PA 6 and correspondingly hindered the crystallization rate of PA 6. However, the mechanism of nucleation and growth of PA6/POE composites was not changed by the addition of L101. The equilibrium melting temperatures of PA 6/POE blends determined by the Hoffman-Weeks theory were lower than that of the neat PA 6, which indicated that the in-situ compatibilization technology decreased the perfection of crystals.The analysis of non-isothermal crystallization showed that the modified Avrami and Mo equation take great advantages over treating the non-isothermal crystallization kinetics. The in-situ compatibilization impeded the growth of crystals and the crystallization rate while it didn’t change the nucleation and growth model of PA 6 crystals.

Related Dissertations

  1. Study on the Synthesis and Properties of Poly(1,4-Cyclohexyledimethylene Terephthalate) (PCT),TQ323.4
  2. Studies on the Effects of Comonomer with Fumarate Segment on PBT’s Crystallization and Melting Behavior,TQ323.4
  3. PAFS Preparation and Application of Research,X703.5
  4. PVDF / PMMA / TiO 2 Composites and weather resistance of,TB33
  5. One -dimensional alumina and alumina whiskers Preparation and Characterization,TB383.1
  6. Study on Non-isothermal Crystallization Kinetics and Crystalline Morphology of PET Fibers Filled iPP Composites,TB332
  7. Nucleating agent crystallization behavior of PBT,TQ323.4
  8. The Influence of Shear History on Crystallization Behavior of iPP Melt,TQ325.14
  9. Numerical Simulation Study on Influence of Shear on Polymer Crystallization,O631.3
  10. The Study on the Cement-based Material Water-reducing Agent Prepared by Modified Starch,TU528.042.2
  11. Effect of the Vibration Force Field on Rheological Behavior and Compatibility of PP/PS/SBS Blends,TB332
  12. Studies on Rheolgical Behaviors and Crystalline Properties of PE/V-POSS Nanocomposites,TB383.1
  13. Preparation and Properties Study of the Modified Poly(Butylene Succinate),TB39
  14. Experimental Study on Cooling Crystallization Process of Concentrated Citric Acid Solution,TQ921.1
  15. Modification Research on Reactive Blending of Poly (Β-Hydroxybutyrate-Co-Β-Hydroxybutyvalerate),TQ316.33
  16. Watermelon vine fiber (WF) / iPP composites and Crystallization Behavior,TB332
  17. Reinforced polyethylene terephthalate composites , structure and properties of,TB332
  18. Study on the Property of Pa6/kaolin Composite,TB332
  19. Investigation on the Preparation of PA6/POE/OMMT Ternary Nanocomposites by Two-step Melting Blend and Its Structure-properties Relationship,TB383.1
  20. Rolling on the Zr-based amorphous alloy heated CRYSTALLIZATION kinetics,TG139.8
  21. Morphology and Structure Effects of Ceria and Supported Copper Oxide Nanocatalyst on the Activity and Adsorption Behavior for NO Reduction,O643.36

CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polycondensation resin and plastic > Polyamide resin and plastic
© 2012 www.DissertationTopic.Net  Mobile