Effect of high temperature annealing on scratch behavior of acrylonitrile styrene acrylate copolymers

Polymer Engineering & Sci

2014

Acrylonitrile-styrene-acrylic (ASA) terpolymer was blended with a sodium neutralized poly (ethylene-co-methacrylic acid) ionomer to develop a weather-resistant ASA with good heat sealing and adhesion properties. Both tensile strengths and modulus were reduced by about 45% with an increase in Na-ionomer concentration of 50%. The mechanical data were fitted with different models that predict mechanical behavior. The thermal stability was increased with the incorporation of ionomer. The temperature corresponding to 50% mass loss (T m50 ) was increased from 400 C (for ASA) to 427 C for 50/50 ASA/Na-ionomer blend. SEM and AFM micrographs reveal the cone-shaped microstructure on the ASA matrix surface after a critical Na-ionomer concentration of 30%. This blend system follows typical non-Newtonian behavior. The heat sealing performance study with metal was also carried out to investigate the utilization of these blend systems as a protective layer for metal. POLYM. ENG. SCI., 55:1571-1579, 2015

Section: Introductionmentioning

confidence: 99%

Study of mechanical, thermal, morphological, and process rheology of acrylonitrile styrene acrylate (ASA)/ Na⁺¹ poly(ethylene‐co‐methacrylic acid) ionomer blend

Polymer Engineering & Sci

2014

“…Few research articles are available on this polymer. To improve the mechanical performance of ASA, glass bead was incorporated, whereas high temperature annealing was done for improvement of scratch resistance . Significant commercial success was found in ASA/Polycarbonate (PC), ASA/poly (butylene terephthalate) (PBT) and ASA/PC/poly(methyl methacrylate) (PMMA) blends among several ASA blend systems like ASA and polyethylene terephthalate blend .…”

Section: Introductionmentioning

confidence: 99%

Effect of Na-ionomer on dynamic rheological, dynamic mechanical and creep properties of acrylonitrile styrene acrylate (ASA)/Na⁺¹poly (ethylene-co-methacrylic acid) ionomer blend

2014

Polym. Adv. Technol.

A special class of engineered copolymers, called ionomers, comprising both electrically neutral repeating units and a fraction of ionized units was melt blended to weather resistant acrylonitrile/styrene/acrylate (ASA) terpolymer for improved electrical conductivity, heat sealing ability, direct adhesion to several polymers, glass and metals without affecting the aesthetics and colorability of ASA. The similar chemical nature of one of the components of each blended materials viz. acrylate rubber in ASA and acrylic acid of Na-ionomer in addition to the presence of ionic crosslinking within Na-ionomer, polar acrylonitrile group in ASA affects chain dynamics as compared to neat polymers. In this context, dynamic rheological properties, DMA properties, creep behavior and DSC of the newly developed ASA/Na-ionomer blends were analyzed. Based on Na-ionomer content, the blend system either forms "mushroom" or "brush" type conformation and formation of ionic crosslinking in "brush regime" leads to three tiers Caylay tree conformation. The different chain topology resulted into characteristic loss modulous (G″) curve during stress relaxation process. The chain conformation as well as ionic crosslinking and ion-dipole interaction between the blend components also affected DSC endotherm peak and glass transition temperature. The tan δ peak temperature from DMA also revealed the similar observation. The creep compliance of the blends was dependent on Na-ionomer content and with temperature. The Findley model analysis of creep compliance suggested that the creep compliance was depended on Na-ionomer content and ionic crosslinking controlled the creep. The findings can be utilized to design weather resistant smart polymer using suitable filler system.

“…Research on ASA and its blend systems is limited. Glass beads were added to ASA for the improved mechanical performance (3), whereas scratch resistance of ASA was improved by high temperature annealing process (4). Only a few blend systems like ASA/ PC, ASA/PBT and ASA/PC/PMMA have gained commercial success (2).…”

Section: Introductionmentioning

confidence: 99%

Study of Dynamic Rheological, Dynamic Mechanical and Creep Properties of Acrylonitrile Styrene Acrylate (ASA)/Zn⁺²poly(ethylene-co-methacrylic acid) Ionomer Blend

Journal of Macromolecular Science, Part A

2014

A new class of blend system comprising weather resistant acrylonitrile/styrene/acrylate (ASA) terpolymer and Zn-ionomer was developed. Based on Zn-ionomer content, the blend system either forms 'mushroom' or 'brush' type conformation which affected dynamic rheology, DSC, DMA and creep properties differently. Formation of ionic crosslinkings by Zn-ionomer in 'brush regime' as well as limited ionic crosslinkings in 'mushroom regime' resulted in different nature molecular chain relaxation response. The DSC endotherm peak and glass transition temperature were also influenced by the type of conformation and ion-dipole interaction between the blend components. The tan d from DMA study also reflected the similar trend. The creep deformation behavior of the blend was found to be dependent on highly deformable Zn-ionomer content and with temperature. The Findley model analysis suggests the ionic crosslinkings may be the possible reason for controlled creep deformation of the blend.