glass transition temperature of polypropylene

EP3218421A1

A two-component curable epoxy resin system having an epoxy component containing a unique combination of two or more epoxy resins with at least one of the epoxy resins being an epoxy novolac type resin The composite made from such resin system exhibits high glass transition temperature

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Glass transition temperature

The glass transition temperature T g is the temperature at which a glass becomes brittle on cooling or soft on heating More specifically it defines a pseudo polymers) Below the glass transition temperature T g amorphous solids are in a glassy state and most of their joining bonds are intact In plastic deformation without fracture This behavior is one of the things which make most

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L

Having both a low molecular weight and a low modulus L-MODU is Idemitsu's newest polyolefin The low melting point of our L-MODU short for low molecular weight and low modulus polypropylene along with its range of viscosities make this advanced polyolefin an ideal choice for hot-melt adhesives non-woven fabrics resin modifiers elastics and pigment-dispersing agents as well as a range

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US Patent for Low creep polypropylene textiles Patent

Low creep polypropylene textiles are disclosed which comprise a blend of isotactic polypropylene with 10-30 weight percent of a resin obtained by hydrogenating polymerized olefinically unsaturated monomers derived from petroleum cracking e g polydicyclopentadiene The hydrocarbon resin has a weight average molecular weight of from 500 to 1000 and a glass transition temperature of from 40

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JPH0892439A

PURPOSE: To obtain a polypropylene resin compsn which is excellent in impact resistance esp in breaking characteristics while retaining the stiffness inherent in polypropylenes CONSTITUTION: This resin compsn comprises a polypropylene resin selected from among a homopolypropylene a propylene-ethylene block copolymer and a random polypropylene having a glass transition point of

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The effect of several surface modified sepiolites on the

The glass transition was measured as the temperature of the maximum in the mechanical damping peak at about 1 Hz (Fig 1) The melting point and crystallinity were measured on a DSC Mettler TA 3000 system The crystallinity of the samples was determined taking as fully crystalline polypropylene enthalpy value 33 cal/g7

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CiteSeerX — Glass Transition Phenomena in Melt

Thermal analysis and dynamic mechanical analysis showed changes in both the polystyrene and polypropylene glass transition temperatures (Tg) over the composition range The major effect was a sharp increase in polystyrene Tg with increasing polypropylene content in the blend A Tg elevation of 5 5C was ob-served at 85 % polypropylene

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Mechanical properties

The glass transition at the maximum of the loss modulus E" is apparent the glass transition temperature can be determined with a precision of 0 1C since it is defined here by a maximum The two-stage softening of the TPU material is attributable to the melting of a partially crystalline soft phase which follows a broad softening of an

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Low creep polypropylene textiles

11/28/19901 A polypropylene textile comprising: an intimate blend of isotactic polypropylene and from 10 to 30 weight percent of a hydrogenated hydrocarbon resin wherein said hydrogenated hydrocarbon resin has a weight average molecular weight of from 500 to 1000 a glass transition temperature of from 40 DEG C to 90 DEG C and wherein the blend exhibits creep resistance at ambient temperature

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Thermoplastic Polyurethane Elastomers

Glass transition temperature The glass transition temperature (Tg) of a plastics is the point at which a reversible transition of amorphous phases from a hard brittle condition to a visco-elastic or rubber-elastic condition occurs Glass transition takes place depending on hardness or rather amorphous portion of a material

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The glass transition temperature measurements of

First published on 25th January 2016 The unit cell of the polyethylene molecular structure was established to investigate the glass transition temperature (T g) The properties of interest predicted by the molecular dynamics method were density free volume specific volume radial distribution function non-bond energy torsion energy mean squared displacement and modulus

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Polymer Chemistry: The Glass Transition

5/18/2020Glass Transition Temperature When an amorphous polymer is heated the temperature at which it changes from a glass to the rubbery form is called the glass transition temperature T g A given polymer sample does not have a unique value of T g because the glass phase is not at equilibrium The measured value of T g will depend on the molecular weight of the polymer on its thermal history and

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Glass transition of polystyrene (PS) studied by Raman

The glass transition (GT) i e the temperature at which most polymers freeze into a solid-like glassy state [] or materials change from a hard brittle state to a softer state when they warm up [] is an important physical process that has been continually studied Control of the GT temperature (T g) in polymeric materials is fundamental for materials engineering because the T g value is very

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Journal of Macromolecular Science Part B

The activation energy of the Tαc mode was found to be lower than that of the relaxation observed around the glass transition temperature Thermally stimulated current (TSC) measurements revealed the existence of an apparent double liquid-liquid transition at 39C and 68 C in undrawn polypropylene and at 28C and 55C in drawn polypropylene

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Dynamics and glass transition temperature of

4/15/2020The current work provides a systematic analysis of the dynamics and glass transition temperature of polystyrene films based on all-atom molecular simulations We would like to point out that the system simulated in this paper is far from being comparable to real experiments because it does not mimic the typical nonequilibrium conformations of

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Tempratures de transition vitreuses moyennes de

Tempratures de transition vitreuses moyennes de polymres (Retour l'index) Mesurer une temprature de transition vitreuse (ou de fusion ou de dgradation) Polymre Abrviation Tg moyenne (C) Polydimthylsiloxane PDMS -127 Polythylne basse densit PEbd -110 Polybutadine BR -102

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What is the Glass Transition Temperature Tg?

10/11/2004The glass transition temperature is a function of chain flexibility The glass transition occurs when there is enough vibrational (thermal) energy in the system to create sufficient free-volume to permit sequences of 6-10 main-chain carbons to move together as a unit

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Atactic polypropylene at high pressure III

One- and two-dimensional (2D) deuteron NMR experiments in high-pressure NMR equipment have been performed in an investigation of the effect of pressure (up to 5000 bar) on the slow chain dynamics in atactic deuterated polypropylene above its glass-transition temperature T g (p) The slow reorientation of the main chain segments which can adequately be described as quasi-isotropic

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