Effect of rigid amorphous phase on glass transition behavior of poly(trimethylene terephthalate)

Hong, Po‐Da; Chuang, Wei‐Tsung; Yeh, Wei-Jun; Lin, Tsang–Lang

doi:10.1016/s0032-3861(02)00617-1

Cited by 68 publications

(65 citation statements)

References 43 publications

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“…Introduction of CNTs can separates the long polymer chain into shorter cooperatively rearranging (CRR) segments [51]. The shift of T g toward lower temperatures can be a result of the higher mobility of these shorter CRR [51][52][53], a three phase model consisting of crystalline, mobile amorphous phase (MAP) and rigid amorphous phase (RAP) was used to describe the structural formation of PTT at various conditions. The RAP exists at the interface of crystal and amorphous phase as a result of the immobilization of a polymer chain due to the crystal.…”

Section: Effect Of Mwcnts Addition On Thementioning

confidence: 99%

Preparation and characterization of nanocomposites based on COOH functionalized multi-walled carbon nanotubes and on poly(trimethylene terephthalate)

Szymczyk¹,

Rosłaniec²,

Zenker³

et al. 2011

Express Polym. Lett.

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Poly(trimethylene terephthalate) nanocomposites containing COOH functionalized multi-walled nanotubes were synthesized with in situ polymerization method. The microstructure of the nanocomposites was studied by SEM, in terms of the dispersion state of the nanotubes and the polymer–nanotube interface. The thermal behaviour, mechanical properties and conductivity of these resultant PTT/MWCNTs nanocomposites were studied. The effect of the presence of MWCNTs on cold crystallization of PTT was monitored by dielectric spectroscopy. From thermal analysis study, it is found that the melting temperature and glass transition temperature are not significantly affected by the addition of MWCNTs. The crystallization temperature of PTT matrix is affected by the presence of CNTs. Nanocomposites have slightly higher degree of crystallinity than neat PTT and their thermo-oxidative stability is not significantly affected by the addition of MWCNTs. The study of the isothermal cold crystallization of amorphous PTT and its nanocomposites monitored by dielectric spectroscopy reveals that the presence of MWCNTs have influence on crystallization rate, especially at higher concentration (0.3 wt%). In comparison with neat PTT, the MWCNTs reinforced nanocomposites posses higher tensile strength and Young’s modulus at low MWCNTs loading (0.05–0.3 wt%). In addition, all nanocomposites show reduction of brittleness as compared to the neat PTT. The electrical percolation threshold was found between 0.3 and 0.4 wt% loading of MWCNTs

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Section: Effect Of Mwcnts Addition On Thementioning

confidence: 99%

Preparation and characterization of nanocomposites based on COOH functionalized multi-walled carbon nanotubes and on poly(trimethylene terephthalate)

Szymczyk¹,

Rosłaniec²,

Zenker³

et al. 2011

Express Polym. Lett.

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“…Tablo 2. PTT ve diğer bazı liflerin fiziksel özellikleri [37] PTT polimerinden üretilen lifler diğer lifler gibi lifin boyanma özelliklerini önemli ölçüde etkileyen kristalin ve amorf bölgeler içermektedir [38]. Genellikle düzenli yapı-ya sahip olan birçok yarı-kristal polimer, kristalin ve amorf bölgeleri içeren geleneksel iki-fazlı model gibi bir modelle kolayca tanımlanamamaktadır.…”

Section: Politrimetilen Tereftalattan üRetilen Kumaşlarunclassified

“…Tekrar eden kristal sistemi üç eksenli olan PTT'nin iki polimer zinciri c-ekseni boyunca gauche-gauche konformasyonunda kıvrımlı glikol Yapılmış araştırmalarda çeşitli polimerlerin ek ara bileşen olarak RAP'a sahip oldukları bulunmuştur. Bu olgu, zayıf zincir esneklikleri yüzünden nispeten rijit polimerlerin kolayca RAP formu alabileceği anlamına gelmektedir [38]. Hong ve arkadaşları [38], PTT'nin sahip olduğu yapı ile ilgili olarak çeşitli kristalleşme şartlarında PTT'nin yapısal oluşumunu tanımlayabilmek için, kristalin, mobil amorf ve RAP içeren üç fazlı bir model kullanmıştır.…”

Section: Poli̇tri̇meti̇len Tereftalatin Ki̇myasal Ve Fi̇zi̇ksel öZelli̇kleri̇unclassified

Poli (trimetilen Tereftalat) Lifleri Bölüm 1: Üretimi, Özellikleri, Kullanım Alanları, Çevresel Etkisi

Yıldırım¹,

Avinç²,

Yavaş³

2012

J Text Eng

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“…It is believed that the glass transition of the mobile amorphous phase is affected by the rigid amorphous phase [91], namely it broadens this relaxation to higher temperatures. A recent work showed that the correlation length for the cooperative motion of polymer chains in the amorphous phase increases with increasing thickness of the rigid amorphous phase [92]. .…”

Section: Influence Of Crystallinity On the Glass Transition Dynamicsmentioning

confidence: 99%

Molecular dynamics in polymeric systems

2004

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It is well known that the properties of polymeric materials depend strongly upon their chemical structure. Other more specific factors that may be related to the chemical structure also determine the macroscopic behaviour of such materials, namely the relative position of the different segments of the polymeric chain, the molecular architecture (molecular weight distribution, branching, copolymer organisation, cross-linking extent, etc.), the crystalline environment and the pressure/temperature conditions. All these factors have a common impact in the material: they are strongly correlated to the mobility on the molecular level. That is why a huge amount of work has been devoted to the study of translational/rotational mobility that occurs within the polymeric chains. This review is intended to provide a brief survey on such kinds of mobilities, how they can be studied and what are their main characteristics. Examples on systems studied in our groups will be provided, obtained by dielectric and mechanical spectroscopies and differential scanning calorimetry. It will be mainly focused on molecular motions that occur in the solid phase (i.e., to temperatures up to the rubbery plateau). The dynamics in blends or copolymers will be avoided here, as they would deserve a special discussion in their own context. Special attention will be paid to the glass transition and the mobility that occurs below and above it. The dynamics that are observed in peculiar systems, such as semi-crystalline or liquid crystalline polymers, will be addressed.

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Effect of rigid amorphous phase on glass transition behavior of poly(trimethylene terephthalate)

Cited by 68 publications

References 43 publications

Preparation and characterization of nanocomposites based on COOH functionalized multi-walled carbon nanotubes and on poly(trimethylene terephthalate)

Preparation and characterization of nanocomposites based on COOH functionalized multi-walled carbon nanotubes and on poly(trimethylene terephthalate)

Poli (trimetilen Tereftalat) Lifleri Bölüm 1: Üretimi, Özellikleri, Kullanım Alanları, Çevresel Etkisi

Molecular dynamics in polymeric systems

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