With the collaboration of Iran Polymer Society

Simulation & Modeling
Molecular dynamics simulation for polyethylene crystallization: Effect of long chain branches

Jieqi Wang; Li Zhao; Minju Song; Fenge Hu; Xuelian He

Volume 8, Issue 2 , July 2021, , Pages 73-84

https://doi.org/10.22063/poj.2021.2834.1173

Abstract
  The influence of long branches on crystallization behavior has been studied by means of molecular dynamics simulations. Using two systems: polyethylene (PE) with long branches (LCB-PE) and PE without long branches (linear-PE) with the same molecular weight, we have examined the crystallization behavior ...  Read More

Reaction engineering
Modelling the catalyst fragmentation pattern in relation to molecular properties and particle overheating in olefin polymerization

Mohsen Najafi; Mahmoud Parvazinia; Mir Hamid Reza Ghoreishy

Volume 1, Issue 2 , December 2014, , Pages 77-91

https://doi.org/10.22063/poj.2014.1044

Abstract
  A two-dimensional single particle finite element model was used to examine the effects of particle fragmental pattern on the average molecular weights, polymerization rate and particle overheating in heterogeneous Ziegler-Natta olefin polymerization. A two-site catalyst kinetic mechanism was employed ...  Read More

Olefin oligomerization
Halogen substituted iron(III) di(imino)pyridine complexes as catalysts for 1-pentene/1-hexene co-oligomerization reactions

Tanja H. Ritter; Helmut G. Alt

Volume 7, Issue 2 , July 2020, , Pages 79-89

https://doi.org/10.22063/poj.2020.2718.1159

Abstract
  Nine different bis(arylimino)pyridine complexes of Fe(III) with different halide substituents (F, Cl, Br, I) at different positions of the iminophenyl group of the ligand have been synthesized, characterized and applied for homogeneous 1-pentene and 1-hexene oligomerization and co-oligomerization reactions ...  Read More

Characterization
Fouling mechanisms during protein microfiltration: The effects of protein structure and filtration pressure on polypropylene microporous membrane performance

Mina Ahsani; Meisam Dabiri Havigh; Reza Yegani

Volume 4, Issue 2 , June 2017, , Pages 175-189

https://doi.org/10.22063/poj.2016.1402

Abstract
  A polypropylene microporous membrane (PPMM) was fabricated by thermally induced phase separation (TIPS) method. The effects of protein size and structure as well as filtration pressure on the membrane performance and fouling mechanisms were investigated using two different proteins, bovine serum albumin ...  Read More

Catalysis
Macromolecular non-releasing additives for safer food packaging: application to ethylene/α-olefins and propylene based polymers

Maria Carmela Sacchi; Simona Losio; Paola Stagnaro; Giorgio Mancini; Luca Boragno; Stefano Menichetti; Caterina Viglianisi; Sara Limbo

Volume 1, Issue 1 , January 2014, , Pages 1-15

https://doi.org/10.22063/poj.2014.888

Abstract
  Some innovative solutions are proposed to the problem of the unavoidable physical migration of antioxidants from plastic films for packaging, in order to minimize the consequent undesirable effect of food contamination. In previous exploratory tests, phenolic antioxidant co-units were achieved and incorporated ...  Read More

Polyolefins Industry
Polyolefin and olefin production in Iran: Current and future capacities

Naeimeh Bahri-Laleh; Mehdi Nekoomanesh-Haghighi; Samahe Sadjadi; Ali Pajouhan

Volume 3, Issue 1 , January 2016, , Pages 11-22

https://doi.org/10.22063/poj.2016.1253

Abstract
  Due to easy availability of cheaper raw material and increase in new applications, the use of polyolefins in various industries is becoming a major priority. The Middle East region, on account of its vast oil and gas reserves has, in the last decade or so, been developing many new petrochemical complexes ...  Read More

Propylene yield from naphtha pyrolysis cracking using surface response analysis

Mohamad Hafizi Bin Zakria; Mohd Ghazali Mohd Nawawi; Mohd Rizal Abdul Rahman

Volume 9, Issue 1 , January 2022, , Pages 15-24

https://doi.org/10.22063/poj.2021.2902.1183

Abstract
  The study was conducted in the actual world-scale olefin plant with a focus on measuring the impact of identified controlled variables at the steam cracker furnace towards the propylene yield. Surface response analysis was conducted in the Minitab software version 20 using the historical data after the ...  Read More

Catalysis
Intelligent catalysts for ethylene oligomerization and polymerization

Helmut G. Alt

Volume 2, Issue 1 , January 2015, , Pages 17-25

https://doi.org/10.22063/poj.2015.1103

Abstract
  EEthylene polymerization catalysts became available in an enormous variety. The challenge in this research is to find catalysts that are able to connect ethylene molecules in such a way that not only linear chains are produced but variations like branched materials that possess very interesting mechanical ...  Read More

Characterization
LDPE and poly(1-butene) blends: Morphology, crystallinity and rheological properties

Reza Poorghasemi; Yousef Jahani

Volume 8, Issue 1 , January 2021, , Pages 21-30

https://doi.org/10.22063/poj.2020.2759.1164

Abstract
  In this work, the compatibility and crystallinity of low density polyethylene (LDPE) and polybutene-1 (PB-1) blends were studied. Various blends of LDPE/PB-1 containing 5, 10 and 20 wt.% PB-1 were prepared in a corotating twin-screw extruder and characterized by scanning electron microscopy (SEM), shear ...  Read More

Compression, supramolecular organization and free radical polymerization of ethylene gas

Dragoslav Stoiljkovic; Slobodan Jovanović

Volume 6, Issue 1 , January 2019, , Pages 23-41

https://doi.org/10.22063/poj.2018.2252.1117

Abstract
  At low pressure, ethylene gas consists of single translating and rotating molecules and behaves as an ideal gas. With decrease of free volume by compression, various rotating supramolecular particles are formed, which require less space for the movement: molecular pairs, bimolecules and oligomolecules. ...  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

Simulation & Modeling
Two novel methods for synthesizing poly (propylene fumarate): Technical aspects and role of vacuum and N2 purging effects

Sara Shahbazi; Yaser Jafari; Fathollah Moztarzadeh; Gity Mir Mohamad Sadeghi

Volume 4, Issue 1 , January 2017, , Pages 27-41

https://doi.org/10.22063/poj.2016.1354

Abstract
  Poly (propylene fumarate) (PPF), a linear unsaturated polyester consisting of alternating propylene glycol and fumaric acid units, can be cured in vivo to fill the skeletal defects with minimal surgical intervention. Many different methods have been reported for synthesizing PPF, but none of them gives ...  Read More

Copolymerization of ethylene with norbornene by using metallocene/TIBA/B(C6F5)3 system

Wei Wang; Shuzhang Qu; Xinwei Li; Jian Chen; Xiaolei Wang; Cui Zheng; Min Guo; Ying Wang

Volume 10, Issue 2 , May 2023, , Pages 71-77

https://doi.org/10.22063/poj.2022.3289.1245

Abstract
  Cyclic olefin copolymer is a type of high-performance polyolefin material, which is prepared by using a single-site catalyst in solution polymerization. The common activator of this system is alkyl aluminoxane or organic  boron/aluminum system. Among them, organic boron is mostly triphenylcarbenium ...  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

Catalysis
Morphology control of clay-mineral particles as supports for metallocene catalysts in propylene polymerization

Takao Tayano; Takehiro Sagae; Takashi Atsumi; Hideshi Uchino; Masahide Murata; Tsutomu Sato

Volume 3, Issue 2 , June 2016, , Pages 79-92

https://doi.org/10.22063/poj.2016.1291

Abstract
  Spray dry granulation of clay minerals was studied to obtain clay mineral base support material for metallocene supported olefin polymerization catalysts. The morphology of the granules was strongly influenced by the nature of the clay mineral itself. Because of swelling characteristics of montmorillonite, ...  Read More

Olefin polymerization and copolymerization
Monomer effect on the chain transfer by diethyl zinc in olefin polymerization by metallocene catalysts

Wei Wang; Taoyi Zhang; Liping Hou

Volume 8, Issue 2 , July 2021, , Pages 85-91

https://doi.org/10.22063/poj.2021.2845.1174

Abstract
  The present paper systematically studies the homo- and copolymerization of ethylene or propylene using metallocene as catalyst and diethyl zinc as chain transfer agent to obtain the polyolefin waxes with narrow molecular weight distribution and with a high activity. The molecular weight of the resultant ...  Read More

Composites and nanocomposites
Permeability and selectivity prediction of poly (4-methyl 1-pentane) membrane modified by nanoparticles in gas separation through artificial intelligent systems

Afshar Alihosseini; Amin Hedayati Moghaddam

Volume 7, Issue 2 , July 2020, , Pages 91-98

https://doi.org/10.22063/poj.2020.2638.1150

Abstract
  In this work, the effects of operative parameters on CH4, CO2, O2, and N2 membrane gas separation for poly (4-methyl-1-pentane) (PMP) membrane modified by adding nanoparticles of TiO2, ZnO, and Al2O3 are assessed and investigated. The operative parameters were type and percentage of nanoparticles, and ...  Read More

Characterization
Tuning the short chain branch distribution of ethylene and 1-hexene copolymers by SiO2-supported silyl chromate catalyst with different Al-alkyl co-catalysts

Ning Zhao; Ruihua Cheng; Qi Dong; Xuelian He; Zhen Liu; Shiliang Zhang; Minoru Terano; Boping Liu

Volume 1, Issue 2 , December 2014, , Pages 93-105

https://doi.org/10.22063/poj.2014.1045

Abstract
  SiO2-supported silyl chromate catalyst is an important industrial catalyst for production of high grade HDPE pipe materials. The control of the short chain branch (SCB) distribution using this catalyst system is still a great challenge. In this work, ethylene and 1-hexene copolymers were synthesized ...  Read More

Catalysis
Well-defined PE-b-PTFE diblock copolymers via combination of coordination chain transfer polymerization and condensation reaction: Facile preparation and surface modification of polyethylene film

Feng He; Peiyuan Li; Anyang Wu; Tao Xu; Zhisheng Fu; Liang Zhu; Zhiqiang Fan

Volume 4, Issue 2 , June 2017, , Pages 191-200

https://doi.org/10.22063/poj.2016.1409

Abstract
  In this paper, a series of well-defined polyethylene-b-polytetrafluoroethylene diblock copolymers (PE–b– PTFEs) were prepared by a coupling reaction of hydroxyl-terminated polyethylene (PE–OH) and isocyanateterminated 1H,1H-perfluoro-1-tetradecanol (PFDO–NCO). PE–OH was ...  Read More

Catalysis
In situ stabilization of polypropylene by lignin using a Ziegler-Natta catalyst

Maria Marques; Renato Oliveira; Rafael Araujo; Bruno Amantes

Volume 1, Issue 1 , January 2014, , Pages 17-24

https://doi.org/10.22063/poj.2014.889

Abstract
  A fourth-generation Ziegler-Natta catalyst was prepared to synthesize polypropylene (PP), which was stabilized by in situpolymerization employing lignin as antioxidant. The antioxidant properties of lignin were compared with those of the commercial antioxidant Irganox 1010. The presence of lignin in ...  Read More

Catalysis
Phillips catalysts synthesized over various silica supports: Characterization and their catalytic evaluation in ethylene polymerization

Ebrahim Ahmadi; Zahra Mohamadnia; Sajjad Rahimi; Mohammad Hasan Armanmehr; Mohammad Hossein Heydari; Mahmood Razmjoo

Volume 3, Issue 1 , January 2016, , Pages 23-36

https://doi.org/10.22063/poj.2016.1268

Abstract
  Ethylene polymerization was carried out using Phillips chromium catalyst based on silica supports such as silica aerogel, SiO2 (Grace 643), and titanium modified SiO2 (G 643), and the results were compared with other catalysts based on SiO2 (Aldrich), SBA-15(Hex), SBA-15(Sp) and MCM-41. A combination ...  Read More

Characterization
Organic solvents effect on the physical and mechanical properties of polyethylene

Ivan Kuryndin; Sergei Kostromin; Rustam Mamalimov; Anton Chervov; Andrei Grebennikov; Sergei Bronnikov

Volume 9, Issue 1 , January 2022, , Pages 25-31

https://doi.org/10.22063/poj.2021.3005.1199

Abstract
  Swelling of high-density polyethylene (PE) in organic solvents, orthodichlorobenzene and orthoxylene, was investigated. The swelling kinetics of the PE specimen was described by the first-order equation. For the first time, the PE specimen swelling rate constant was shown to decrease with increasing ...  Read More

Catalysis
Kinetics of ethylene polymerization over titanium-magnesium catalysts: The reasons for the observed second order of polymerization rate with respect to ethylene

Mikhail A. Matsko; Vladimir A. Zakharov; Marina I. Nikolaeva; Tatiana B. Mikenas

Volume 2, Issue 1 , January 2015, , Pages 27-38

https://doi.org/10.22063/poj.2015.1112

Abstract
  The data on the effect of ethylene concentration on polymerization rate for several modifications of modern highly active titanium–magnesium catalysts TiCl4/MgCl2 are presented. These catalysts differ in titanium content and conditions of support preparation, activities, and the shape of kinetic ...  Read More

Olefin oligomerization
Kinetic and microstructural studies of Cp2ZrCl2 and Cp2HfCl2-catalyzed oligomerization of higher α-olefins in mPAO oil base stocks production

Ahad Hanifpour; Mahdi Hashemzadeh Gargari; Mohammad Reza Rostami Darounkola; Zahra Kalantari; Naeimeh Bahri-Laleh

Volume 8, Issue 1 , January 2021, , Pages 31-40

https://doi.org/10.22063/poj.2020.2802.1170

Abstract
  Herein a quenched-flow kinetic technique was applied to calculate the rate constants of 1-hexene and 1-octene oligomerization catalyzed by the Cp2ZrCl2 and Cp2HfCl2/MAO catalyst systems, and subsequently a mechanism for the higher α-olefin oligomerization reaction was proposed. The oligomerization ...  Read More

Olefin polymerization and copolymerization
Competitive particle growth at different conditions of oligo-micelle formation in hydro-alcoholic solution of anionic double-chain emulsifier via batch emulsion polymerization of vinyl chloride

Aliasghar Mahdavi Akerdi; Mehdi Nekoomanesh

Volume 7, Issue 1 , January 2020, , Pages 33-44

https://doi.org/10.22063/poj.2019.2501.1138

Abstract
  The condition of oligo-micelle formation of sodium di-isodecyl sulfosuccinate (SDIDS) emulsifier in hydroalcoholic solutions is used to study particle formation of vinyl chloride emulsion polymerization in a batch reactor. The change on micellization behavior was investigated by critical micelle concentration ...  Read More