Effect of elastomer functionality on toughened PET

Tanrattanakul, Varaporn; Hiltner, A.; Baer, E.; Perkins, W. G.; Massey, F.L.; Moet, A.

doi:10.1016/s0032-3861(96)00991-3

Cited by 61 publications

(66 citation statements)

References 6 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…A fine layer (about 100-150 µm) with elongated rubber particles covered the specimens, 3,7,8,34,35 whatever the EGMA content. The likely effects of such a fine layer on the mechanical properties are negligible due to its low thickness, so it will not be considered in the discussion of the morphology.…”

Section: Morphologymentioning

confidence: 94%

Compatibilization of Poly(butylene terephthalate)/Metallocenic Poly(ethylene-octene) Blends by Means of Poly(ethylene-co-glycidyl methacrylate)

Aróstegui¹,

Nazábal²

2003

Polym J

View full text Add to dashboard Cite

ABSTRACT:Super-tough poly(butylene terephthalate) (PBT) based blends were obtained by melt blending PBT with 20 wt% poly(ethylene-octene) copolymer (PEO), and varying amounts of poly(ethylene-co-glycidyl methacrylate) (EGMA) as a compatibilizer. Partially reacted EGMA dissolved completely, mainly in the PBT-rich phase, up to 4% EGMA, at which point a crystalline EGMA phase appeared. The reaction and the consequent compatibilization led to a decrease in the particle size and to an improvement in the adhesion between the components. Two percent EGMA was the minimum content required to reach maximum super-toughness, that also corresponded to the maximum ductility. The inter-particle distance (τ) was the parameter that controlled super-toughness. The study of the parameters that τ c depends on, showed that τ c was independent of the modulus of the dispersed phase (E d ) over the τ c range studied. However, the dependence of τ c on adhesion at the interphase was seen by means of the comparison of the τ c -interfacial tension relationship of this blend with those of previous studies.

show abstract

Section: Morphologymentioning

confidence: 94%

Compatibilization of Poly(butylene terephthalate)/Metallocenic Poly(ethylene-octene) Blends by Means of Poly(ethylene-co-glycidyl methacrylate)

Aróstegui¹,

Nazábal²

2003

Polym J

View full text Add to dashboard Cite

show abstract

“…The processing conditions for the PET72 blends were as described previously. 2,3 The barrel temperature was 280°C, and the screw speed was 35 rpm. For PET95 blends, the barrel temperature was 290°C, and the screw speed was 45 rpm.…”

Section: Methodsmentioning

confidence: 99%

“…3,4 In contrast, particle size was strongly dependent on elastomer functionality: the higher the functionality, the smaller the particle size and the narrower the particle size distribution. These trends were at-tributed to an increase in the degree of grafting.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of poly(ethylene terephthalate) modified with functionalized polymers

Pawlak

Perkins

Massey

et al. 1999

J. Appl. Polym. Sci.

Self Cite

View full text Add to dashboard Cite

This study examined the effect of blending poly(ethylene terephthalate) (PET) with 5% of a functionalized polymer. The blends were characterized by particle size and size distribution, unnotched tensile behavior, toughness, and notch sensitivity. The improved properties of blends that incorporated a functionalized elastomer were consistent with in situ formation of a graft copolymer by reaction with PET end groups. Triblock copolymers were examined that had styrene end blocks and an ethylene/ butylene midblock (SEBS) with grafted maleic anhydride. The present study extended previous investigations that focused on level of grafting to examine the effects of component molecular weight and PET hydroxyl-to-carboxyl end-group ratio. Increasing the molecular weight of the SEBS and decreasing the hydroxyl-to-carboxyl ratio of the PET increased the effectiveness of the SEBS. In addition, a mix of an unfunctionalized SEBS with a functionalized SEBS was more effective than a single SEBS with the same total anhydride content. The same elastomers were the most effective for modifying a lower molecular weight PET (intrinsic viscosity 0.73) and a higher molecular weight PET (intrinsic viscosity 0.95). Some functionalized polypropylenes included in the study did not enhance the properties of PET.

show abstract

“…Such interfacial irregularity can be either spatial (caused by viscous effects) or temporal (elastic effects). At the shear rates in the film production process ( _ g < 150 s 21 for the hardware and polymers used in this study), polyester melt flows are considered Newtonian and inelastic [17][18][19][20]. The analysis presented in this article therefore considers only viscous effects in polymer coextrusion and ignores elastic effects.…”

Section: Introductionmentioning

confidence: 99%