With the collaboration of Iran Polymer Society

Catalysis
Storage time effect on dynamic structure of MgCl2.nEtOH adducts in heterogeneous Ziegler-Natta catalysts

Najmeh Hadian; Shokoofeh Hakim; Mehdi Nekoomanesh-Haghighi; Naeimeh bahri-Laleh

Volume 1, Issue 1 , January 2014, , Pages 33-41

https://doi.org/10.22063/poj.2014.904

Abstract
  Primary MgCl2.3.3EtOH adduct (PCT1) was prepared by melt quenching method and then submitted into a programmed thermal dealcoholation project using a fluidized bed reactor. During thermal dealcoholation program, different MgCl2.nEtOH support samples with n= 3.0, 2.7, 2.4, and 2.1 were selected and named ...  Read More

Biobased polyester from soybean oil: Synthesis, characterization and degradation studies

Mariana del Valle Bernard; Verónica Viviana Nicolau; Miriam Cristina Strumia

Volume 9, Issue 1 , January 2022, , Pages 45-60

https://doi.org/10.22063/poj.2021.3019.1203

Abstract
  Industrially used polymers derived from fossil fuels have a negative environmental impact when being disposed of. They could be efficientlyreplaced by natural polymers, which are potentially degradable and which can match or even surpass them in mechanical performance. In this work, a rigid thermosetting ...  Read More

Catalysis
Probing into morphology evolution of magnesium ethoxide particles as precursor of Ziegler-Natta catalysts

Goond Hongmanee; Patchanee Chammingkwan; Toshiaki Taniike; Minoru Terano

Volume 3, Issue 1 , January 2016, , Pages 47-57

https://doi.org/10.22063/poj.2016.1266

Abstract
  Mg(OEt)2 with spherical morphology is one of the most important precursors for the preparation of industrial Ziegler-Natta catalysts. In the present article, morphology evolution of Mg(OEt)2 particles is studied in the course of the synthesis. The morphology of Mg(OEt)2 particles is observed throughout ...  Read More

Polymeric foams
High porosity polyethylene aerogels

Christophe Daniel; Simona Longo; Gaetano Guerra

Volume 2, Issue 1 , January 2015, , Pages 49-55

https://doi.org/10.22063/poj.2015.1113

Abstract
  Monolithic aerogels of high molecular weight polyethylene (Mw= 3x106- 6x106 g/mol) have been prepared by solvent extraction with supercritical carbon dioxide from thermoreversible gels prepared in decalin. These low density and highly porous aerogels present an apparent porosity up to 90%. The aerogel ...  Read More

Polyolefins Functionalization
Origin of catalytic activity differences between phosphine and phosphine oxide-based structures in the water-crosslinkable polyalkoxysilane composition

Shohei Tanaka; Kenta Adachi

Volume 8, Issue 1 , January 2021, , Pages 49-62

https://doi.org/10.22063/poj.2020.2813.1171

Abstract
  Organocatalysts have attracted enormous interest in the water-crosslinking reaction in silane-grafted polyolefins (SGPOs) system owing to their simplicity, low toxicity and environmentally benign nature compared to organotin catalysts, which are most used in SGPOs system. We focus on organophosphorus ...  Read More

Polymer processing
Embedding neat and carboxylated nanodiamonds into polypropylene membranes to enhance antifouling properties

Shahab Hoseinpour; Yoones Jafarzadeh; Reza Yegani; Sepideh Masoumi

Volume 6, Issue 1 , January 2019, , Pages 63-74

https://doi.org/10.22063/poj.2018.2264.1120

Abstract
  The aim of the present work is to enhance the antifouling properties of polypropylene (PP) membrane based on hydrophilicity improvement. Different contents of neat and modified nanodiamond (0.25, 0.50, 0.75 and 1.00 wt.%) were embedded into PP membranes. Nanodiamond nanoparticles were carboxylated by ...  Read More

Polyolefin degradation
Evaluation of effects of thymolphthalein on thermooxidative stability of polypropylene

Nikoo Karami; Reza Jahanmardi

Volume 4, Issue 1 , January 2017, , Pages 79-86

https://doi.org/10.22063/poj.2016.1394

Abstract
  The present work is aimed to find a new and efficient type of antioxidants for polypropylene. Hence, effects of 3,3-bis(4-hydroxy-2-methyl-5-propan-2-ylphenyl)-2-benzofuran-1-one, generally known as thymolphthalein, on thermo-oxidative stability of polypropylene in solid and melt states were evaluated ...  Read More

Computational chemistry & molecular modeling
Exploring the possibility of chemisorption of ethylene on graphene with and without defects

Parisa Alamdari; Farhad Sharif; Saeedeh Mazinani

Volume 10, Issue 2 , May 2023, , Pages 101-115

https://doi.org/10.22063/poj.2023.3316.1254

Abstract
  The effect of structural defects on graphene interaction with other molecules is of high interest. In this study, the interaction of ethylene molecules with pristine graphene (PG) and defective graphenes including single (SVG) and double (DVG) vacancies, were investigated using dispersion-corrected periodic ...  Read More

Structure and property relationship
The effect of high-energy electron beam on drawn and undrawn high density polyethylene fibers

Jalil Morshedian; Yousef Jahani; Farshad Sharbafian; Foroogh Sadat Zarei

Volume 2, Issue 2 , June 2015, , Pages 109-119

https://doi.org/10.22063/poj.2015.1166

Abstract
  HDPE monofilaments were obtained using different extruders and drawn by post-extruder equipments. After solidification, drawn and undrawn monofilaments (draw ratio 7:1) were irradiated with 10 MeV electron beams in air at room temperature at 25, 50, 75, 100 and 125 kGy dose ranges to induce a network ...  Read More

Polymer processing
Natural rubber/natural rubber reclaim nanocomposites: Role of functional nanoparticles, mixing sequences and coupling agents

Shirin Shokoohi; Ghasem Naderi

Volume 8, Issue 2 , July 2021, , Pages 115-122

https://doi.org/10.22063/poj.2021.2893.1182

Abstract
  Elastomer vulcanizates based on natural rubber (NR), NR reclaim (NRR) and layered silicates were compounded in an internal mixer and cured on a two-roll mill. Cure characteristics and mechanical properties of samples based on 50NR/50NRR reinforced with Cloisite 20A, Cloisite 30B and Nanolin DK1 were ...  Read More

Characterization
Quantification of identical and unique segments in ethylene-propylene copolymers using two dimensional liquid chromatography with infra-red detection

Sampat Bhati; Tibor Macko; Robert Brüll

Volume 3, Issue 2 , June 2016, , Pages 119-133

https://doi.org/10.22063/poj.2016.1323

Abstract
  Hyphenating High Temperature High Performance Liquid Chromatography (HT-HPLC) with High Temperature Size Exclusion Chromatography (HT-SEC) (High Temperature Two Dimensional Liquid Chromatography (HT-HPLC x HT-SEC or HT 2D-LC)) leads to an isocratic elution in the second dimension, which in turn enables ...  Read More

Determination of kinetic parameters for ethylene polymerization (with and without hydrogen) by Ziegler-Natta catalyst

Seyed Mehdi Ghafelebashi Zaranda; Ali Safinejad

Volume 7, Issue 2 , July 2020, , Pages 121-130

https://doi.org/10.22063/poj.2020.2703.1157

Abstract
  In this study, slurry polymerization kinetics of ethylene with TiCl4/Mg(OEt)2/AlR3 Ziegler-Natta catalysts in various conditions using the model of sum square error (SSE) (method I) and model of least square error (LSE) (Method II) was investigated. For this purpose the molecular weight distributions ...  Read More

Computational chemistry & molecular modeling
Testing DFT ability to predict the stereoselectivity of group 4 metallocenes in propylene polymerization

Naeimeh bahri-Laleh; Laura Falivene; Luigi Cavallo

Volume 1, Issue 2 , December 2014, , Pages 139-146

https://doi.org/10.22063/poj.2014.1100

Abstract
  In this study we have tested the ability of a standard DFT computational protocol to reproduce the experimentally obtained stereoselectivity of 26 different C2-symmetric zirconocene catalysts active in propylene polymerization. The catalysts were chosen for their relevance in metallocene catalyzed ...  Read More

Catalysis
Introduction of titanium species into fluorine-modified SiO2- supported Cr-V bimetallic catalyst for ethylene polymerization and ethylene/1-hexene copolymerization

Qiaoqiao Sun; Ruihua Cheng; Zhen Liu; Xuelian He; Ning Zhao; Boping Liu

Volume 4, Issue 2 , June 2017, , Pages 221-234

https://doi.org/10.22063/poj.2017.1464

Abstract
  Chromium-vanadium (Cr-V) bimetallic catalysts are prepared by the introduction of vanadium into the Phillips catalyst which is one of the most significant industrial ethylene polymerization catalysts for tuning the Phillips catalyst performances and improving polyethylene properties. In the present work, ...  Read More

Catalysis
Recent advances in the polymerization of butadiene over the last decade

Giovanni Ricci; Giuseppe Leone

Volume 1, Issue 1 , January 2014, , Pages 43-60

https://doi.org/10.22063/poj.1999.890

Abstract
  The stereospecific polymerization of conjugated dienes began in 1954 with the first catalysts obtained by combining TiCl4 or TiCl3 with aluminum-alkyls, i.e. the catalytic systems previously employed for ethylene and propylene polymerizations. Subsequently, many other catalytic systems were obtained ...  Read More

Catalysis
Active site nature of magnesium dichloride-supported titanocene catalysts in olefin polymerization

Toshiaki Taniike; Keisuke Goto; Minoru Terano

Volume 2, Issue 1 , January 2015, , Pages 57-63

https://doi.org/10.22063/poj.2015.1114

Abstract
  Heterogeneous Ziegler-Natta and homogeneous metallocene catalysts exhibit greatly different active sitenature in olefin polymerization. In our previous study, it was reported that MgCl2-supported titanocenecatalysts can generate both Ziegler-Natta-type and metallocene-type active sites according to the ...  Read More

Polyolefin degradation
Biodegradation of PP films modified with organic pro-degradant: natural ageing and biodegradation in soil in respirometric test

Larissa Montagna; Andre Luis Catto; Maria Madalena Forte; Ruth Marlene Santana

Volume 3, Issue 1 , January 2016, , Pages 59-68

https://doi.org/10.22063/poj.2016.1279

Abstract
  In this study, PP films were modified with an organic pro-degradant in different concentrations (1, 2 and 3 wt.%), exposed in the first step of degradation to natural ageing for 100 days followed by biodegradation in simulated soil in the respirometric test for 100 days. At the end of the combined degradation ...  Read More

Membrane
CO2 absorption through PP/fSiO2 nanocomposite hollow fiber membrane contactor

Saba Raveshiyan; Parya Amirabedi; Reza Yegani; Behzad Pourabbas; Akram Tavakoli

Volume 9, Issue 1 , January 2022, , Pages 61-71

https://doi.org/10.22063/poj.2021.3015.1202

Abstract
  Wetting of polymeric hollow fiber membranes by chemical absorbents is one of the main challenges of gasliquid membrane contactors. This study explored an appropriate method to fabricate a superhydrophobic polypropylene (PP) hollow fiber membrane by incorporating fluorinated silica nanoparticles (fSiO2 ...  Read More

Structure and property relationship
Compatibilization of polycarbonate/poly (ethylene terephthalate) blends by addition of their transesterification product

Majid Habibollahi; Morteza Ehsani; Jalil Morshedian

Volume 6, Issue 1 , January 2019, , Pages 75-83

https://doi.org/10.22063/poj.2018.2271.1121

Abstract
  In this study, poly carbonate (PC) and poly (ethylene terephthalate) (PET) were reactive melt-blended under two different conditions to produce PC/PET copolymers. For each condition, samples were taken at specified mixing times representative a specific structure of copolymers and each one employed to ...  Read More

Catalysis
Ziegler-Natta catalysts for propylene polymerization – Interaction of an external donor with the catalyst

Valentina Nikolaevna Panchenko; Ludmila Viktorovna Vorontsova; Vladimir Aleksandrovich Zakharov

Volume 4, Issue 1 , January 2017, , Pages 87-97

https://doi.org/10.22063/poj.2016.1385

Abstract
  The interaction of the external donor (propyltrimethoxysilane - PTMS) with titanium-magnesium catalysts (TMCs) containing dibutylphthalate (DBP) as internal donor, which were prepared in different ways, was studied by chemical analysis and infrared diffuse reflectance spectroscopy (DRIFTS). The chemical ...  Read More

Reaction engineering
Mathematical modeling the effect of catalyst initial shape and the crack pattern in olefin copolymerization

Marzieh Nouri; Mahmoud Parvazinia; Hassan Arabi; Mohsen Najafi

Volume 2, Issue 2 , June 2015, , Pages 121-133

https://doi.org/10.22063/poj.2015.1165

Abstract
  A two-dimensional (2D) single particle model for the copolymerization of propylene-ethylene with heterogeneous Ziegler-Natta catalyst is developed. The model accounts for the effects of the initial shape of the catalyst and carck/ pore patterns on the copolymer composition, polymerization rate and the ...  Read More

Simulation & Modeling
Kinetic study on liquid propylene polymerization using a modified heat flow reaction calorimeter

Mehrsa Emami; Farzin Hormozi; Hossein Abedini

Volume 8, Issue 2 , July 2021, , Pages 123-133

https://doi.org/10.22063/poj.2021.2823.1172

Abstract
  Bulk phase polymerization of propylene with a 4th generation of Ziegler-Natta catalyst was kinetically investigated by means of heat flow calorimetry. The assumptions and modifications on isothermal calorimetric method were demonstrated. Our calibration method showed that heat exchange with the reactor ...  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

Characterization
Study on the fouling behavior of HDPE/PE-g-MA/EVA blend membrane fabricated via thermally induced phase separation method

Setareh Heidari; Yoones Jafarzadeh; Mahdi Seyfollahi Samarin; Reza Yegani

Volume 4, Issue 2 , June 2017, , Pages 235-251

https://doi.org/10.22063/poj.2017.1466

Abstract
  In this study, neat HDPE and HDPE/PE-g-MA/EVA blend membranes were fabricated via thermally induced phase separation (TIPS) method and their fouling behaviors were examined using filtration of BSA protein. Membranes were characterized using FESEM, AFM, ATR-FTIR analyses and porosity measurement. Fouling ...  Read More

Catalysis
Propene-cycloolefin polymerization

Laura Boggioni; Incoronata Tritto

Volume 1, Issue 1 , January 2014, , Pages 61-75

https://doi.org/10.22063/poj.2014.891

Abstract
  Highly active metallocenes and other single site catalysts have opened up the possibility of polymerizing cycloolefins such as norbornene (N) or of copolymerizing them with ethene (E) or propene (P). The polymers obtained show exciting structures and properties. E-N copolymers are industrially produced ...  Read More