Search results for "blend"

Thermomechanical degradation of polyethylene/polyamide 6 blend-clay nanocomposites

2014

Controlling dielectrical properties of polymer blends through defined PEDOT nanostructures

2016

[EN] The paper reports the crucial role of the morphology of poly(3,4-ethylenedioxythiophene) (PEDOT) nanostructures on the thermal and dielectric properties of polymer blends prepared thereof. PEDOT nanostructures with two different morphologies (nanoparticles and nanowires) were synthesized. The size for the nanoparticles was in the range 10 40 nm and the diameter of the nanowires was of ca. 200 nm. These nanostructures were blended with an insulating polymer matrix, poly(methyl methacrylate) (PMMA), to evaluate the dielectrical properties of the materials. The results of broadband dielèctric spectroscopy showed a strong correlation between the morphology of the nanostructure and the impr…

Is blended best for the Net Generation? : a review of the changing landscape of foreign language learning in higher education

2008

Photo-degradation behaviour of OMMT-filled PE/PA blends: improvement of the photo-resistance through morphology modification

2009

Modification of EVOH copolymers with e-caprolactone: synthesis and compatibilization effects in PE/PVC blends

2001

Polyethylene-polycaprolactone graft copolymers with different chemical structures (i.e. different number and length of PCL grafts and molecular weight of PE backbone) were synthesized from various EVOH copolymers and e-caprolactone, using Aluminum isopropoxide as catalyst, and were tested for their compatibilizing capability in PE/PVC blends. PE and PCL segments in the graft copolymers were found completely immiscible, while PCL segments of the graft copolymers were found completely miscible with PVC. When graft copolymers were added to PE/PVC blends they proved to be good agents for the dispersion of PVC phase in the PE matrix. SEM showed also improved adhesion between the dispersed PVC ph…

UNEVEN DISTRIBUTION OF ORGANOCLAY IN HDPE/PA6 BLENDS - IMPACT OF MICROSTRUCTURE AND MECHANICAL BEHAVIOUR

2009

Oxazoline functionalization of polyethylenes and their blends with polyamides and polyesters

2001

The compatibilization of blends of polyamide-6 (PA6) with linear low density polyethylene (LLDPE) and of poly(ethylene terephthalate) (PET) with high density polyethylene (HDPE), by functionalization of the polyethylenes with oxazoline groups was investigated. Chemical modification of LLDPE and HDPE was carried out by melt free radical grafting with ricinoloxazoline maleinate. Blends preparation was made either with a two-steps procedure comprising functionalization and blending, and in a single step in which the chemical modification of polyethylene with the oxazoline monomer was realized in situ, during blending. The characterization of the products was carried out by FTIR spectroscopy an…

Oxazoline-containing compatibilizers for polyamide/SAN and polyamide/ABS blends

2002

Polyamide (PA) and acrylonitrile/butadiene/styrene copolymer (ABS) may appear as a mixture in the recycled plastic stream. The incompatibility of these blends results in a blend with poor mechanical properties. The aim of this work is to partially convert the nitrile groups of the acrylonitrile/styrene copolymer (SAN) into oxazoline groups by reaction with aminoethanol (AE). Such modified SAN (SAN-m) can react with the amine or carboxylic acid end groups of PA, and therefore used as compatibilizers for blends of PA with ABS. SAN-m was found to reduce the SAN-domain size in the PA/SAN-blends. The initial acrylonitrile content of SAN-m had a strong influence on the degree of conversion into o…

Palynology and lithostratigraphy of Late Elsterian to Early Saalian aquatic sediments in the Ziemupe–Jūrkalne area, western Latvia

2000

Abstract This study is based upon lithological and palynological investigation of test-drilling cores along the Baltic Sea coast. Three intertill units of basin sediments are underlain by a thin layer of Lētiža (Elsterian) till and overlain by glaciotectonically deformed Kurzeme (Saalian Complex) till. The Kurzeme till differs from the Lētiža till by higher contents of limestone clasts and rounded hornblende grains. The lowermost intertill unit consists of glaciolacustrine to glaciomarine laminated clay of the Sudrabi member, a late glacial deposit of the Lētiža glaciation. Treeless vegetation covered the adjoining land. Next is the marine to brackish Akme n rags formation, deposited during…

Aktivitātes tālmācības vidusskolas 10. klases angļu valodas stundās pašvadītas mācīšanās pilnveidošanai

2021

Darba autore nesen sāka strādāt par angļu valodas skolotāju tālmācības vidusskolā. Pētījuma mērķis bija pielietot praksē uzdevumus, kas pilnveidotu pašvadītas mācīšanās prasmes tālmācības skolas 10. klases angļu valodas stundās. Pētījuma bāze bija 49 tālmācības skolēni, kuriem bija jāveic ikmēneša uzdevumos iestrādāts pašvērtējums un atgriezeniskā saite, attiecīgi tika veikta kvalitatīva datu vākšana un analīze. Tika apzināts, kādas pašvadītas mācīšanās prasmes audzēkņi ir apguvuši un kādi izaicinājumi joprojām pastāv. Rezultātā tika ieskicētas turpmāk veicamās aktivitātes pašvadītas mācīšanās sekmēšanai. Pētījuma atziņas var izmantot skolotāji, kuri saskaras ar tiešsaistes mācību izaicināj…