✦ LIBER ✦

Analysis of branched poly(ethylene terephthalate)

✍ Scribed by Klaus Weisskopf

Publisher: John Wiley and Sons
Year: 1990
Tongue: English
Weight: 555 KB
Volume: 39
Category: Article
ISSN: 0021-8995
DOI: 10.1002/app.1990.070391009

No coin nor oath required. For personal study only.

✦ Synopsis

Poly(ethylene terephthalate) modified with l,l,l-trishydroxymethyl propane (THP) and pentaerythritol was analyzed with respect to branching by combined GPC/viscometry measurements. The average effective functionality of the branching molecules was calculated and compared with the theoretically attainable functionality, thus permitting one to distinguish between different branching theories. Maximum effectiveness was achieved only at low concentrations of the modifiers added. Pentaerythritol and THP were found equivalent in the ratio 1 : 3, estimated from their influence on the polydispersities of the branched polyester. It was shown that apparent molecular weights obtained from GPC calibration with linear standards can be converted by correction factors. The resulting molecular weight averages of the branched PET samples were in a good agreement with those from the GPC/viscometry iteration procedure.

📜 SIMILAR VOLUMES

Synthesis and thermal analysis of branch

Synthesis and thermal analysis of branched and “kinked” poly(ethylene terephthalate)

✍ M. Jayakannan; S. Ramakrishnan 📂 Article 📅 1998 🏛 John Wiley and Sons 🌐 English ⚖ 193 KB 👁 2 views

Poly(ethylene terephthalate) (PET) was synthesized by self-condensation of bis-(2-hydroxyethyl) terephthalate (BHET). Copolymerization of BHET with ethyl, bis-3,5-(2-hydroxyethoxy) benzoate (EBHEB) and ethyl, 3-(2-hydroxyethoxy) benzoate (E3HEB) yielded copolymers that contain varying amounts of bra

Dynamic rheology of branched poly(ethyle

Dynamic rheology of branched poly(ethylene terephthalate)

✍ Rosu, Ruxandra F; Shanks, Robert A; Bhattacharya, Sati N 📂 Article 📅 2000 🏛 John Wiley and Sons 🌐 English ⚖ 123 KB 👁 2 views

Branched poly(ethylene terephthalate)s (BPET) of varying molar mass have been synthesized with glycerol and pentaerythritol as branching comonomers, and their rheological behaviour has been measured. In this study, we describe the use of dynamic and steady shear measurements to examine the in¯uence

Synthesis and Characterisation of Branch

Synthesis and Characterisation of Branched Poly(ethylene terephthalate)

✍ Rosu, Ruxandra F.; Shanks, Robert A.; Bhattacharya, Sati N. 📂 Article 📅 1997 🏛 John Wiley and Sons 🌐 English ⚖ 387 KB 👁 2 views

Branched poly(ethylene terephthalate)s (PET) were synthesised with a variety of molar masses and with a large range of degree of branching by introduction of mono-, tri-(glycerol) and tetra-functional (pentaerythritol) comonomers to dimethyl terephthalate and ethylene glycol. The monofunctional alco

Characterization of poly(ethylene tereph

Characterization of poly(ethylene terephthalate) and poly(ethylene terephthalate) blends

✍ Bronwyn Fox; Graeme Moad; Gary van Diepen; Ian Willing; Wayne D. Cook 📂 Article 📅 1997 🏛 Elsevier Science 🌐 English ⚖ 723 KB

Dynamic mechanical analysis of poly(trim

Dynamic mechanical analysis of poly(trimethylene terephthalate)—A comparison with poly(ethylene terephthalate) and poly(ethylene naphthalate)

✍ Allan R. Mackintosh; John J. Liggat 📂 Article 📅 2004 🏛 John Wiley and Sons 🌐 English ⚖ 115 KB 👁 2 views

Influence of branching on the properties

Influence of branching on the properties of poly(ethylene terephthalate) fibers

✍ C. Hess; P. Hirt; W. Oppermann 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 149 KB 👁 2 views

A series of branched poly(ethylene terephthalate) samples was prepared by employing 0.07-0.42 mol % trimethylolpropane (TMP) for melt polycondensation. These polymers were characterized with respect to molar mass, intrinsic viscosity, and melt viscosity. Spinning into fibers took place at spinning s