With the collaboration of Iran Polymer Society
Polyolefin blends
Effect of replacing EPDM with high molecular weight amorphous poly(1-hexene) on the mechanical behavior of iPP/iPP-g-MA/EPDM blends

Mahsa Mobini-Dehkordi; Gholam-Reza Nejabat; Mohammad-Mahdi Mortazavi

Volume 10, Issue 1 , January 2023, , Pages 13-20

https://doi.org/10.22063/poj.2022.2967.1193

Abstract
  Varying amounts of a high molecular weight poly(1-hexene) (PH, Mv=1.7×106 Da) are substituted for EPDM in an iPP/iPP-g-MA/EPDM blend (weight ratio: 76:4:20) and mechanical properties as well as phase morphology of the blends are studied and compared. The results show that by substituting the entire ...  Read More

Polyolefin degradation
Thermal and tensile behavior of LLDPE films containing limited amounts of an oxo-biodegradable additive and/or amorphous poly(1-hexene) before and after UV irradiation

Sara Zarei; Gholam-Reza Nejabat; Mohammad-Mahdi Mortazavi; Soheyl KhajehPour-Tadavani

Volume 7, Issue 2 , July 2020, , Pages 111-119

https://doi.org/10.22063/poj.2020.2611.1149

Abstract
  Varying amounts of an amorphous poly(1-hexene) (PH, Mv 1.7×106 Da) were added to an LLDPE matrix containing 3% w/w Addiflex oxo-biodegradable additive (HES-W) and extruded and converted into films. Then the effect of presence of PH was investigated on microstructure, thermal and tensile behavior ...  Read More

Reaction engineering
Interplay of reversible chain transfer and comonomer incorporation reactions in coordination copolymerization of ethylene/1–hexene

Ali Ebrahimi; Saeid Ahmadjo; Mohsen Mohammadi; Mohammad-Mahdi Mortazavi; Mostafa Ahmadi

Volume 7, Issue 1 , January 2020, , Pages 1-11

https://doi.org/10.22063/poj.2019.2447.1132

Abstract
  Coordinative chain transfer polymerization (CCTP) has opened a new path for the development of novel products like olefin block copolymers and chain-end functional polyolefins. However, conflicting results are frequently reported on the catalyst performance including activity and comonomer selectivity ...  Read More

Polyolefin degradation
Changes in crystallinity of HDPE films containing different amounts of an oxo-biodegradable additive due to UVC exposure

Soheyl Khajehpour-Tadavani; Gholam-Reza Nejabat; Mohammad-Mahdi Mortazavi

Volume 7, Issue 1 , January 2020, , Pages 25-32

https://doi.org/10.22063/poj.2019.2468.1135

Abstract
  Crystallinities of high-density polyethylene (HDPE) films containing various amounts of an oxo-biodegradable additive (HES-W) were investigated immediately after preparation and 6 weeks after ultraviolet (UV) irradiation (λ=254 nm). HDPE granules were mixed with oxo-biodegradable masterbatch in ...  Read More

Characterization
Evaluation of continuous and discrete melting endotherms in determination of structural heterogeneities in Ziegler-Natta catalyzed linear low density polyethylene

Mostafa Ahmadi; Seyed Mohammad Mehdi Mortazavi; Saeid Ahmadjo; Majid Zahmati; Khosrow Valieghbal; Davoud Jafarifar; Reza Rashedi

Volume 3, Issue 2 , June 2016, , Pages 135-146

https://doi.org/10.22063/poj.2016.1332

Abstract
  Ethylene / 1-butene copolymers at different comonomer levels were synthesized using Ziegler-Natta catalyst to evaluate the applicability of thermal fractionation methods in predicting chemical composition distribution (CCD). The continuous melting endotherms by DSC were converted to continuous CCD, and ...  Read More

Catalysis
Study of Ziegler-Natta/(2-PhInd)2ZrCl2 hybrid catalysts performance in slurry propylene polymerization

Gholam-Reza Nejabat; Mehdi Nekoomanesh; Hassan Arabi; Hamid Salehi-Mobarakeh; Gholam-Hossein Zohuri; Mohammad-Mahdi Mortazavi; Saeid Ahmadjo; Stephen A. Miller

Volume 2, Issue 2 , June 2015, , Pages 73-87

https://doi.org/10.22063/poj.2015.1145

Abstract
  Several types of hybrid catalysts are made through mixing of 4th generation Ziegler-Natta (ZN) and (2-PhInd)2ZrCl2  metallocene catalysts using triethylaluminum (TEA) as coupling agent. Response surface methodology (RSM) is used to evaluate the interactive effects of different parameters including ...  Read More