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

Abstract

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.

Mechanical properties, morphology and molecular characteristics of poly(ethylene terephthalate) toughened by natural rubber

“…3 show the outer and the inner zone of an injection molded specimen of the 80/20 wt% blend that was freezede fractured in a transverse direction. These results reveal that the PET/NR blends exhibited a skin-core morphology similar to those seen in other rubber modified PET system such as PET/SEBS [10,22], PBT-Ph/mPEO [23] or PBT/PEO [24]. The holes near the edge of the sample containing the NR domains are elongated NR of predominantly rod-shapes as shown in Fig.…”

“…3a. A few holes were oval, suggesting that some of the elongated NR domains were slightly flattened just as seen in PET/SEBS-g-MA blend [10,22] and PBT/PEO blend [25]. The morphology of the core, seen in Fig.…”

Study of masterbatch effect on miscibility and morphology in PET/HDPE blends

“…[25] The effective compatibilization in PET/HDPE systems was determined by the effect of the compatibilizer type: EGMA, PE-g-MA, GMA, and different isocyanate compatibilizers, [26][27][28][29][30][31][32][33] compatibilizer content and mixing procedure. [23] Furthermore, the procedure of waste poly(ethylene-terephthalate) recycling (PET) by blend preparing is a method that results in material with changed or some new properties.…”

Thermal properties and morphology of recycled poly(ethylene terephthalate)/maleic anhydride grafted linear low‐density polyethylene blends

“…Many researches have reported that the blending of PET with polyolefins and/or elastomers can improve the mechanical properties of PET 4–16. The effect of SEBS‐ g ‐MA on properties of PET was extensively investigated by Atnrattanakul4, 5 and Yu 6.…”