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Dissertations / Theses on the topic 'Polypropylene'

Author: Grafiati
Published: 4 June 2021
Last updated: 25 July 2025

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1

Tang, Eunice Wai Chong. "Preparation and characterization of polypropylene-polypropylene (PP-PP) composites /." View Abstract or Full-Text, 2003. http://library.ust.hk/cgi/db/thesis.pl?MECH%202003%20TANG.

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Thesis (M. Phil.)--Hong Kong University of Science and Technology, 2003.<br>Includes bibliographical references (leaves 91-95). Also available in electronic version. Access restricted to campus users.
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2

Slánská, Petra. "Aplikace termochromních látek v polymerních materiálech." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216383.

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V textilním průmyslu je v dnešní době veliká konkurence. Každá novinka může znamenat velký zisk. Tato diplomová práce se bude zabývat aplikací termochromních přísad (látka reagující na teplotu změnou své barvy) do polymerní matrice, konkrétně polypropylenu, a jeho další zpracování u výrobce technického polotovaru - výroba vláken. Po výrobě vzorků bude provedeno jejich testování. Porovnají se vlastnosti polypropylenu s a bez termochromních přísad a zhodnotí se, nakolik tyto přísady ovlivňují vlastnosti polypropylenu. Ze získaných výsledků se stanoví možnost využití termochromních přísad v texti
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3

Wang, Shi-Wei. "Controlling the structure and properties of toughened and reinforced isotactic polypropylene." Thesis, Université de Lorraine, 2012. http://www.theses.fr/2012LORR0231/document.

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En tant que polymère de grande diffusion, les applications du polypropylène isotactique (PP) sont limitées par sa faible resistance au choc. D'après la relation structure - propriétés, sa résistance au choc peut être améliorée en contrôlant sa structure. Dans ces travaux, différents types d'agents nucléants ont été utilsés pour promouvoir la formation des cristaux de type bêta et de mélanges de deux PP de masses molaires différentes. Les propriétés mécaniques, le comportement à la rupture, et la morphologie cristalline ont été étudiés. Les influences du type et de la teneur en peroxyde et agen
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4

Wang, Xiaowei. "Adhesive bonding of polypropylene." Thesis, University of Bristol, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247559.

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5

Işık, Kıvanç Tanoğlu Metin. "Layered silicate/polypropylene nanocomposites/." [s.l.]: [s.n.], 2006. http://library.iyte.edu.tr/tezler/master/makinamuh/T000532.pdf.

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6

Cancelas, Sanz Aarón José. "High impact polypropylene : structure evolution and impact on reaction." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1210/document.

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Les homopolymères à base de polypropylène isotactique (iPP en anglais) ont une rigidité plus élevée que le polyéthylène (PE), mais aussi une dureté limitée, en particulier à températures plus basses. Ceci peut être surmonté en incorporant un élastomère copolymère d'éthylène et de propylène directement dans la matrice semi-cristalline de iPP. De tels mélanges obtenus in situ dans des réacteurs successifs sont bien connus, et leur production nécessite un procédé multi-étapes. De façon succincte, un procédé industriel pour la synthèse de PP choc (hiPP, high impact PP en anglais) implique 2 zones
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7

Yilmaz, Sule Seda. "Preparation And Characterization Of Organoclay-polypropylene Nanocomposites With Maleic Anhydride Grafted Polypropylene Compatibilizer." Master's thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613291/index.pdf.

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The aim of this study was to improve the mechanical properties &ldquo<br>Moplen&rdquo<br>EP300L which is a heterophase copolymer. Polymer blends and nanocomposites were prepared by melt compounding method in a twin screw extruder. Nanofil&reg<br>5 (N5) and Nanofil&reg<br>8(N8) were used as the organoclays, and maleic anhydride grafted polypropylene (M) was used as the compatibilizer. The effects of additive concentrations and types of organoclays on the morphology, mechanical and thermal properties were investigated. Organoclay loading over 2 wt% prevented the intercalation mechanism resulting
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8

Lepoutre, Priscilla. "The microstructure of polypropylene blends with ethylene vinyl alcohol copolymer and maleated polypropylene /." Thesis, McGill University, 1989. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=61816.

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9

Njoroge, Daniel [Verfasser]. "Thesis: Preparation and characterization of modified-graphene oxide/polypropylene nanocomposites : polypropylene nanocomposites / Daniel Njoroge." Berlin : epubli, 2016. http://www.epubli.de/.

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10

Köller, Frank. "Modifizierte Polypropylene durch Metallocen-Katalyse." [S.l. : s.n.], 1998. http://deposit.ddb.de/cgi-bin/dokserv?idn=961143738.

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11

Can, Semra. "Characterization Of Serpentine Filled Polypropylene." Phd thesis, METU, 2008. http://etd.lib.metu.edu.tr/upload/3/12609434/index.pdf.

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ABSTRACT CHARACTERIZATION OF SERPENTINE FILLED POLYPROPYLENE Can, Semra Ph.D., Department of Polymer Science and Technology Supervisor: Prof. Dr. Teoman Tin&ccedil<br>er March 2008, 158 pages In this study, the aim is to prepare polypropylene (PP)/serpentine composites and study their mechanical, thermal and morphological properties. Another objective is to explore whether it is possible to have PP/serpentine nanocomposites with melt intercalation method by using the advantage of the layer silicate structure of serpentine. The most widely used fillers in PP are talc and mica which belong to th
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12

Mizutani, T., E. Nakane, K. Kaneko, and M. Ishioka. "Space Charge Dynamics in Polypropylene." IEEE, 2004. http://hdl.handle.net/2237/7166.

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13

Sura, Ravi Kishore. "Oriented crystallization of syndiotactic polypropylene." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/8293.

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14

GIROIS, STEPHANE. "Photooxydation du polypropylene : aspects cinetiques." Paris, ENSAM, 1995. http://www.theses.fr/1995ENAM0041.

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Nous avons porte un nouveau regard sur la photooxydation du polypropylene homopolymere et d'un copolymere ethylene-propylene en utilisant des outils cinetiques pour decrire le mecanisme de photooxydation dans un but de prediction de duree de vie. La demarche consiste a identifier les produits d'oxydation formes par irtf en fonction de la duree d'exposition aux uv a differentes temperatures sous differentes intensites lumineuses, et se basant sur un mecanisme cinetique en boucle fermee, de proposer un modele qui caracterise la photoodegradation du materiau en fonction des conditions d'expositio
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15

Hoza, Adam. "Effect of Ethylene and Propylene on Performance of Ziegler - Natta Catalyst in Stopped - Flow Polymerization." Doctoral thesis, Vysoké učení technické v Brně. Fakulta chemická, 2017. http://www.nusl.cz/ntk/nusl-320775.

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Výzkum v této práci byl zaměřen na přípravu a charakterizaci blokových kopolymerů typu polypropylen-blok-poly(propylenu-co-ethylenu) (dále jen PP-blok-EPR). Tyto materiály jsou považovány za účinné kompatibilizátory mezi semi-krystalickou polypropylenovou (PP) matricí a amorfními doménami statistického kopolymeru propylenu a etylenu (EPR) v rázuvzdorném sekvenčním kopolymeru (ICP) a proto byl výzkum zaměřen na zkoumání vlivu přídavku blokového kopolymeru PP-blok-EPR na vlastnosti komerčního ICP. Blokové kopolymery byly připraveny za použití techniky „stopped-flow“. Pro tento účel byla zkonstru
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16

Pauvert, Olivier. "Stabilité de la vincristine dans les seringues en polypropylène." Paris 5, 1995. http://www.theses.fr/1995PA05P231.

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17

Tam, Mei San. "Study of sisal fiber-reinforced polypropylene, polyethylene and polypropylene/polyethylene blend composites prepared by compression molding." access abstract and table of contents access full-text, 2005. http://libweb.cityu.edu.hk/cgi-bin/ezdb/dissert.pl?msc-ap-b21175123a.pdf.

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Thesis (M.Sc.)--City University of Hong Kong, 2005.<br>At head of title: City University of Hong Kong, Department of Physics and Materials Science, Master of Science in materials engineering & nanotechnology dissertation. Title from title screen (viewed on Sept. 4, 2006) Includes bibliographical references.
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18

Pedrazzoli, Diego. "Understanding the effect of nanofillers on the properties of polypropylene and glass fiber/polypropylene multiscale composites." Doctoral thesis, Università degli studi di Trento, 2014. https://hdl.handle.net/11572/368547.

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In this study, polypropylene (PP) based nanocomposites were prepared by incorporating different kinds and amounts of silica nanoparticles and graphite nanoplatelets (GNP). The role of various percentages of compatibilizer polypropylene grafted with maleic anhydride (PPgMA) into PP nanocomposites was also investigated. In order to analyze the effect of the manufacturing process on the material’s properties, the samples were produced by (i) melt compounding and compression molding and (ii) extrusion and injection molding. It was found that injection molding provides significantly greater stiff
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19

Pedrazzoli, Diego. "Understanding the effect of nanofillers on the properties of polypropylene and glass fiber/polypropylene multiscale composites." Doctoral thesis, University of Trento, 2014. http://eprints-phd.biblio.unitn.it/1322/1/Thesis_PhD_Pedrazzoli_2014.pdf.

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In this study, polypropylene (PP) based nanocomposites were prepared by incorporating different kinds and amounts of silica nanoparticles and graphite nanoplatelets (GNP). The role of various percentages of compatibilizer polypropylene grafted with maleic anhydride (PPgMA) into PP nanocomposites was also investigated. In order to analyze the effect of the manufacturing process on the material’s properties, the samples were produced by (i) melt compounding and compression molding and (ii) extrusion and injection molding. It was found that injection molding provides significantly greater stiffne
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20

Psarreas, Alexandros. "Nitroxide-mediated controlled degradation of polypropylene." Thesis, University of Waterloo, 2006. http://hdl.handle.net/10012/2832.

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Nitroxide-mediated Controlled Degradation of Polypropylene <br /> Controlled-rheology polypropylene resins (CRPP) have been produced industrially for years using reactive extrusion processes employing peroxides as free radical initiators. The molecular weight characteristics of CRPP materials can be tailor-made depending on the final application in a very efficient and economic manner. <br /><br /> A PP-based nitroxide (NOR) with the trade name Irgatec CR76 has been recently developed by CIBA Chemicals, as a source of radicals and it is currently being evaluated for the production o
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21

Derakhshandeh, Maziar. "Crystallization of polypropylene : experiments and modeling." Thesis, University of British Columbia, 2015. http://hdl.handle.net/2429/55605.

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In this study, the quiescent crystallization of several polypropylenes (PPs) with different molecular characteristics was first examined using Differential Scanning Calorimetry (DSC) and Polarized Optical Microscopy (POM). The Avrami/Nakamura equation was employed to fit and predict crystallization kinetics under isothermal and non-isothermal conditions. The Avrami/Nakamura model was found to predict the non-isothermal crystallization data of the various PPs very well over a range of cooling rates. POM was used in line with a rotational rheometer to further examine the behaviour under quiescen
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22

Wang, Xiao Chuan. "Branching of polypropylene through reactive extrusion." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq21396.pdf.

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23

Laihonen, Sari J. "Polypropylene : Morphology, defects and electrical breakdown." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-268.

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24

Wu, Xiang. "Quantitative infrared dichroism of isotactic polypropylene." Thesis, Georgia Institute of Technology, 1987. http://hdl.handle.net/1853/9382.

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25

Shindo, Nobuhiko. "Structural analysis of thick polypropylene moldings." Thesis, Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/10251.

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26

Ahmed, Syed Iqbal. "Coloration of polypropylene : prospects and challenges." Thesis, Heriot-Watt University, 2006. http://hdl.handle.net/10399/2023.

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27

Khan, Shahid Wahab. "Rheological properties of talc-filled polypropylene." Thesis, Loughborough University, 2001. https://dspace.lboro.ac.uk/2134/7567.

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In this study polypropylene was modified by a range of talc (Mg3(OH)2Si4OlO) fillers. Three different types of surface modifiers were also used, two types of silanes (octyltriethoxysilane and y-aminopropyltriethoxysilane) and maleic anhydride modified polypropylene plus polyethylene wax as an external lubricant. A series of compounds were prepared in an APV twin screw compounder, based on talc addition level, morphology, particle size, surface coatings and coupling agents. The study showed that addition of talc to PP increases the shear viscosity and the blend system generally follows the powe
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28

Jodoin, Jeffrey Joseph. "The production of polypropylene microcellular foam." Thesis, Massachusetts Institute of Technology, 1985. http://hdl.handle.net/1721.1/14857.

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29

Zeng, Fuquan. "Investigation into the colouration of polypropylene." Thesis, University of Manchester, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.557624.

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Polypropylene (PP) offers many advantages to the textile processor in terms of its durability and end use properties. However, a major technical flaw of PP is its inability to be dyed due to its relative lack of dye adsorption sites and high crystallinity. Therefore it is primarily mass pigmented, with pigment incorporated into the polymer melt prior to extrusion. While this approach offers a successful commercial route it does lack process flexibility. Some research has focused on modifying the polymer structure by incorporating dyeable copolymers or chemically degrading the base polymer by a
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30

Gupta, Saloni. "Physico-chemical properties of polypropylene glycols." Thesis, University of Greenwich, 2015. http://gala.gre.ac.uk/21538/.

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Poly(propylene glycol) (PPG) samples of different molecular mass were characterized using differential scanning calorimetry, modulated differential scanning calorimetry, thermogravimetry and thermally stimulated current (TSC) spectroscopy. It was shown, by TSC, that the glass transition temperature and the degree of molecular mobility increased with increasing molecular mass of PPG. Additional experiments showed that PPGs of molecular mass 425, 1000 and 2000 Da undergo one global relaxation process; however, PPG 2700 (Da) undergoes an additional relaxation process after the glass transition wh
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31

liu, lei. "Polypropylene block copolymer synthesis by metathesis." University of Akron / OhioLINK, 2021. http://rave.ohiolink.edu/etdc/view?acc_num=akron1625523936334755.

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32

Thiraphattaraphun, Linda. "Structure/property relationships in polypropylene nanocomposites." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/structureproperty-relationships-in-polypropylene-nanocomposites(388eafc0-a98e-4a78-be0d-4d647a122d87).html.

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In this work, structure/property relationships in polypropylene (PP) nanocomposites have been investigated for different nanofillers. Nanofillers of modified clay based on montmorillonite (MMT) and multi-wall carbon nanotubes (MWNTs) have been selected and incorporated to the PP matrix as either single nanofillers or hybrid nanofillers. Melt mixing via a twin screw extruder and further moulding by injection moulding have been used to prepare PP nanocomposites. Moreover, the dilution of MWNT masterbatch has been used to prepare PP/MWNT and PP/clay/MWNT nanocomposites. Three types of the PP nano
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33

Metin, Dildare Tıhmınlıoğlu Funda. "Interfacial enhancement of polypropylene-zeolite composites/." [s.l.]: [s.n.], 2002. http://library.iyte.edu.tr/tezler/master/kimyamuh/T000132.pdf.

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34

Barroso, Gago Luísa. "Création in situ d'une phase thermodurcissable dans une matrice polyoléfine par extrusion réactive." Electronic Thesis or Diss., Lyon, 2021. http://www.theses.fr/2021LYSE1031.

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Cette thèse a pour objectif d’exploiter une gamme de thermoplastique/thermodurcissable à base de polyoléfines et en particulier le polypropylène (PP). Deux types de systèmes thermodurcissables ont été retenus : un système type époxy/amine et un système époxy/durcisseur phénolique, compatibilisés avec la phase thermoplastique par un polypropylène greffé anhydride maléique (PP-g-MA). Le but de ce travail de thèse est de comprendre les mécanismes de réaction et leurs avancements au cours de l’étape de dispersion dans la matrice polyoléfine pendant l’opération d’extrusion réactive ainsi que le lie
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35

Lee, Tiehong. "A study of miscibility, morphology, crystallization and melting behavior of isotactic poly(propylene) in blends of poly(propylene) and poly(1-butene)." Thesis, This resource online, 1992. http://scholar.lib.vt.edu/theses/available/etd-07292009-090250/.

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36

Msuya, Winston Filipo Seth. "The influence of physical ageing and morphology on yield in polypropylene." Thesis, [Hong Kong] : University of Hong Kong, 1988. http://sunzi.lib.hku.hk/hkuto/record.jsp?B12434036.

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37

Manji, Aminmohamed. "Electro synthesis of propylene oxide in a bipolar trickle bed reactor." Thesis, University of British Columbia, 1985. http://hdl.handle.net/2429/25117.

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The synthesis of propylene oxide by electrolysis of dilute sodium bromide solution with propylene gas was investigated in an electrochemical bipolar reactor consisting of six parallel fixed beds of graphite particles separated by polypropylene felt diaphragms. One reactor was operated in single pass and recycle mode with two phase co-current flow of propylene and sodium bromide solution through the beds of graphite particles. The maximum pressure in the system was 2.22 atmospheres absolute. The effects of superficial current density* (413 - 2687 A/m²), electrolyte (sodium bromide solution)
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38

Amanabadi, Seyed Hassan Jafari. "Impact toughening and crystallization studies on binary blends of polypropylene." Thesis, IIT Delhi, 1998. http://localhost:8080/xmlui/handle/12345678/3113.

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39

Al-Shehri, Abdulhadi S. "Tensile and fracture behaviour of isotropic and die-drawn polypropylene-clay nanocomposites : compounding, processing, characterization and mechanical properties of isotropic and die-drawn polypropylene/clay/polypropylene maleic anhydride composites." Thesis, University of Bradford, 2010. http://hdl.handle.net/10454/5223.

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As a preliminary starting point for the present study, physical and mechanical properties of polypropylene nanocomposites (PPNCs) for samples received from Queen's University Belfast have been evaluated. Subsequently, polymer/clay nanocomposite material has been produced at Bradford. Mixing and processing routes have been explored, and mechanical properties for the different compounded samples have been studied. Clay intercalation structure has received particular attention to support the ultimate objective of optimising tensile and fracture behaviour of isotropic and die-drawn PPNCs. Solid-st
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40

Badji, Célia. "Vieillissement de matériaux composites renforcés de fibres naturelles : étude de l’impact sur les propriétés d’aspect et sur les émissions dans l’air intérieur." Thesis, Pau, 2017. http://www.theses.fr/2017PAUU3022/document.

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Les biocomposites sont des matériaux renforcés de fibres issues de ressources renouvelables. Ces matériaux sont une solution alternative aux composites renforcés de fibres de verre ou de carbone. En effet, leur légèreté et leurs propriétés mécaniques intéressantes leur confèrent un intérêt grandissant dans les secteurs tels que la construction (terrasse, meubles de jardin) ou l’automobile (panneaux de porte, tableaux de bord). Toutefois, les milieux humides, la température et le rayonnement UV sont des paramètres pouvant compromettre la stabilité physico-chimique des biocomposites. L’objectif
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41

Ecevit, Tuba Safiye. "Synthesis And Characterization Of Surface Sulfonated Polypropylene." Master's thesis, METU, 2003. http://etd.lib.metu.edu.tr/upload/3/12604846/index.pdf.

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ABSTRACT SYNTHESIS AND CHARACTERIZATION OF SURFACE SULFONATED POLYPROPYLENE FILMS Ecevit, Safiye Tuba M.S., The Department of Polymer Science and Technology Supervisor: Leyla Aras, Prof. Dr. Co- Supervisor: Teoman Tin&ccedil<br>er, Prof. Dr. March 2004, 44 pages The basic reseach on the surface sulfonation of the polypropylene is very important due to the surface design for higher functionalization. For this purpose, liquid-phase sulfonation of the polypropylene surfaces at various temperatures for different time periods were performed by concentrated sulphuric acid. The phys
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42

Yayla, Saniye. "Production And Characterization Of Polypropylene/organoclay Nanocomposites." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12608485/index.pdf.

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Polypropylene, PP, based nanocomposites were produced via melt blending method by using twin-screw extrusion in this study. The effects of organoclay type, compatibilizer type, and mixing order of components on the morphology, thermal, mechanical and flow properties of ternary nanocomposites were investigated. Terpolymer of ethylene/butyl acrylate/maleic anhydride, ethylene/methyl acrylate/glycidyl methacrylate, and copolymer of ethylene/glycidyl methacrylate elastomers were used as compatibilizer, whereas Cloisite&reg<br>30B, Cloisite&reg<br>15A, and Cloisite&reg<br>25A were used as organocla
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43

Vange, Kjetil. "Validation of material model for polypropylene (PP)." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for konstruksjonsteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18517.

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Polymers are the up and coming engineering material. The number of possibleapplications is increasing fast and so is the need for a good polymer material model. Thescientists at SIMLab at NTNU have developed such a material model. In this thesis is thematerial model calibrated to represent an impact modified polypropylene used by Toyota.The validation started with the calibration. A review of the theoretical background of thematerial model and a detailed explanation of the calibration procedure are given todescribe the derivation of the calibrated material model. The model is then applied in F
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44

Sælen, Kristin. "Validation of material model for polypropylene (PP)." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for konstruksjonsteknikk, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18793.

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A hyperelastic-viscoplastic material model intended for thermoplastics has been developed by SIMLab at NTNU. This model formed the basis of the thesis, where a material model for the polymer polypropylene was calibrated and validated. Four rounds of material testing were carried out. Tension and compression tests formed the basis for a calibration of the material model. Two different component tests were used for validation; stretching of a plate with a hole and plate impact tests.The calibrated model was implemented as a user-defined material model in the non-linear finite element code LS-DYN
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45

Khoshkava, Vahid. "Polypropylene (PP) nanocomposites incorporating nanocrystalline cellulose (NCC)." Thesis, McGill University, 2014. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=121442.

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The main objective of this dissertation is to evaluate the feasibility of preparation of well dispersed polypropylene (PP)/nanocrystalline cellulose (NCC) nanocomposites by melt processing. There has been growing interest in using NCC as reinforcement in polymer systems because of its interesting properties and the abundant and renewable sources of cellulose. Preparation of polymer nanocomposites incorporating NCC has been mainly carried out using solution or water-assisted mixing. Only few attempts have been made to prepare it using melt mixing. Polypropylene (PP) is a commodity polymer with
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46

Francois, heude Alexandre. "Kinetic modeling of the polypropylene photothermal oxidation." Phd thesis, Ecole nationale supérieure d'arts et métiers - ENSAM, 2014. http://pastel.archives-ouvertes.fr/pastel-01069008.

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Developing numerical tools for polymer lifetime prediction constitutes a promising opportunity for shortening the duration of material certification procedures in the automotive industry without decreasing their reliability. This PhD thesis aims at modeling the photothermal oxidation of isotactic polypropylene (iPP), which is responsible for the alteration of both its mechanical and aspect properties. The adopted approach consists in coupling the kinetics of photo- and thermo-oxidation reactions with physical phenomena, such as oxygen transport and UV-light attenuation in the material thicknes
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47

Ohno, Sadatoshi. "Stress transfer in polypropylene fibre reinforced cement." Thesis, University of Surrey, 1990. http://epubs.surrey.ac.uk/849/.

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48

Badr, Atef Samir M. "Performance of advanced polypropylene fibre reinforced concrete." Thesis, University of Leeds, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.437106.

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49

Amer, Ismael. "Molecular weight effects on crystallization of polypropylene." Thesis, Stellenbosch : University of Stellenbosch, 2011. http://hdl.handle.net/10019.1/6649.

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Thesis (PhD)--University of Stellenbosch, 2011.<br>ENGLISH ABSTRACT: The crystallization of polyolefins is an important parameter in determining the properties of such materials. The crystallization phenomenon generally depends on the molecular symmetry (tacticity) and molecular weight of the material. In this study, a series of polypropylenes was prepared using heterogeneous MgCl2-supported Ziegler catalysts with two different external donors, diphenyldimethoxysilane (DPDMS) and methyl-phenyldimethoxysilane (MPDMS), and two different homogeneous metallocene catalysts, racethylene- bis(i
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McConville, Eileen. "Investigation of the thermoforming of polypropylene packaging." Thesis, Queen's University Belfast, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.675461.

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Packaging is one of the major fields for plastic materials, with extruded polypropylene (PP) sheet widely used in the production of thin gauge tubs and containers for the food and beverage industry using the thermoforming process. In an increasingly competitive market understanding the fundamental material properties and the effect of thermoforming process settings can help a company deliver material and efficiency savings allowing them to reduce production, manufacturing and development costs. The main aim of this work was to advance the practical understanding of the processing of PP for pac
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