Extensional and complex viscosities of linear and branched polycarbonate blends

Park, Jung Hoon; Hyun, Jae Chun; Kim, Woo Nyon; Kim, Sung Ryong; Ryu, Seung Chan

doi:10.1007/bf03218262

Cited by 17 publications

(13 citation statements)

References 7 publications

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“…The elongational flow properties of polymers are usually varied by weight‐average molecular weight and level of branching structure of the polymers used, additives, and processing variables (i.e., test temperature, draw ratio, roller speed) [1–3]. There have been a number of studies on the measurements of the elongational flow properties [1–11], mostly involving homopolymers, such as low‐density polyethylene (LDPE) [3, 5–7], linear low‐density polyethylene (LLDPE) [4–7], high‐density polyethylene (HDPE) [1, 3, 8], polypropylene (PP) [9], and polycarbonate [11]. Attempts to improve the melt strength of homopolymer melts have also been made especially for tension‐thinning melts, mainly by blending with a secondary polymer whose molecular structure is similar to that of the primary polymer but which contains a branching structure.…”

Section: Introductionmentioning

confidence: 99%

“…Yamaguchi and Suzaki [8] found that the addition of crosslinked HDPE to HDPE enhanced the melt strength without the sagging effect of the blend for thermoforming sheet applications. Park et al [11] used a Meissner extensional rheometer and found that the extensional and complex viscosities for blends of linear polycarbonate (L‐PC) increased with increasing amounts of branched polycarbonate (Br‐PC).…”

Section: Introductionmentioning

confidence: 99%

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Mechanical strengths of molten and solidified LLDPE/LDPE blends and wood/LDPE composites under tensile deformation

Harnnarongchai¹,

Sitticharoen²,

Intawong³

et al. 2011

Vinyl Additive Technology

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The mechanical strengths of neat low‐density polyethylene (LDPE), a blend of LDPE with linear low‐density polyethylene (LLDPE), and a composite of LDPE with wood flour (wood/LDPE) were investigated in molten and solidified states under tensile deformation. The results are discussed in terms of the effects of LLDPE and wood contents, roller speed, and volumetric flow rate. In LLDPE/LDPE blends, incorporating LLDPE from 0 to 30 wt% into LDPE caused a slight increase in drawdown force, a larger fluctuation in drawdown force, and a reduction of maximum roller speed to failure. The mechanical properties of the solidified LLDPE/LDPE corresponded to those of the molten LLDPE/LDPE with regard to the effect of LLDPE content. For wood/LDPE composites, increasing the wood flour content in molten LDPE caused considerable reductions in drawdown time and maximum roller speed to failure. The drawdown force increased with increasing wood flour up to 10 wt% before it decreased at the wood loading of 20 wt%. A number of voids and pores on the extrudate surfaces became obvious for the composites with 20 wt% of wood content. Increasing wood content enhanced the tensile modulus for the solidified LDPE but decreased its tensile strength. Unlike those of LLDPE/LDPE blends, the changes in tensile modulus and strength of solidified wood/LDPE composites with wood content did not correspond to those of the molten composites. In all cases, the drawdown force increased with increasing roller speed. The effect of volumetric flow rate from the extruder on the mechanical strengths of the solidified blends was more pronounced than on those of the molten ones. J. VINYL ADDIT. TECHNOL., 2011. © 2011 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical strengths of molten and solidified LLDPE/LDPE blends and wood/LDPE composites under tensile deformation

Harnnarongchai¹,

Sitticharoen²,

Intawong³

et al. 2011

Vinyl Additive Technology

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“…Polyamides have good dimensional stability, high rigidity (especially when PA is reinforced with fi breglass), good resistance to compression, wear, shocks and vibra# ons; they are hard materials, and maintain their hardness and tenacity at high temperatures, with no visible transforma# ons up to 80-90°C [3][4][5][6][7][8][9]. PAs are semitransparent in moulded parts with thin wall and opaque in moulded parts with thick wall.…”

Section: Introductionmentioning

confidence: 99%

Thermally resistant polymer composites reinforced with fibreglass

Georgescu¹,

Sönmez²,

Niţuică³

et al. 2017

LFJ

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THERMALLY RESISTANT POLYMER COMPOSITES REINFORCED WITH FIBREGLASSABSTRACT. The aim of this paper was to obtain and characterize polymeric composites based on polyamide (PA) and polycarbonate (PC), reinforced with chemically ac# vated surface fi breglass (FG), with advanced proper# es and temperature resistance. Polyamide was employed as the polymeric matrix, and the polycarbonate as disperse phase. As PA and PC are immiscible due to the polarity diff erences, a polyoxazoline compa# biliser was used. A* erwards, fi breglass was introduced in this composite. However, in order to obtain these proper# es, many varia# ons of recipes had to be tested, with diff erent concentra# ons of the components. The star# ng point was a mixture of 70% PA and 30% PC. The amount of compa# biliser varied up to 5%, and the FG amount, up to 30%. The characteris# cs of these polymeric composites with compa# biliser and simple and treated fi breglass were studied. KEY WORDS: polymeric composites, polyamide, polyethylene, fi breglass COMPOZITE POLIMERICE TERMOREZISTENTE RANFORSATE CU FIBRĂ DE STICLĂREZUMAT. Scopul acestui ar# col a fost realizarea şi caracterizarea compozitelor polimerice pe bază de poliamidă (PA) şi policarbonat (PC), armate cu fi bre de s# clă cu suprafeţe ac# vate chimic (FG), cu caracteris# ci performante şi rezistente la temperatură. A fost u# lizată ca matrice polimerică poliamida, iar faza dispersă a fost policarbonatul. PA şi PC fi ind nemiscibile datorită diferenţelor de polaritate, a fost u# lizat un compa# bilizator pe bază de polioxazolină. În acest compozit s-au introdus, apoi, fibre de sticlă. Totuşi, în vederea obţinerii acestor proprietăţi au trebuit testate mai multe variante de reţete cu diferite concentraţii ale componenţilor. Astfel s-a pornit de la un amestec de 70% PA şi 30% PC. Cantitatea de compatibilizator a variat până la 5%, iar cea de FG până la 30%. Au fost studiate caracteristicile acestor compozite polimerice cu compatibilizator precum şi cu fibre de sticlă funcţionalizate şi nefuncţionalizate. CUVINTE CHEIE: compozite polimerice, poliamidă, polie# lenă, fi bră de s# clă COMPOSITES POLYMÈRES THERMOSTABLES RENFORCÉS AUX FIBRES DE VERRERÉSUMÉ. Le but de cet ar# cle était de concevoir et de caractériser des composites polymères à base de polyamide (PA) et polycarbonate (PC), renforcés aux fi bres de verre ac# vées chimiquement (FG) avec des caractéris# ques de haute performance et de résistance à la température. La polyamide a été u# lisée comme matrice polymère et la phase dispersée était le polycarbonate. PA et PC étant non miscibles en raison des diff érences de polarité, un agent de compa# bilité à base de polyoxazoline a été u# lisé. La fi bre de verre a ensuite été introduite dans ce composite. Cependant, afi n d'obtenir ces propriétés, plusieurs variantes de rece$ es avec diff érentes concentra# ons des composants ont dû être testées. On a par# d'un mélange de 70% PA et 30% PC. La quan# té d'agent de compa# bilité a varié jusqu'à 5% et la quan# té de fi bres de verre jusqu'à 30%. Les ca...

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“…These properties offer high use value in fields which require materials with advanced characteristics: dimensional stability, resistance to UV radiation, solvents, aggressive chemical agents [1][2][3][4][5][6][7], impact resistance, and possibility of use in a wide range of temperatures etc. Properties result from a set of summed specific characteristics of individual materials, which arise from physical, mechanical and chemical interactions that occur during manufacturing processes that result in a polymer nanostructure.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Compatibiliser on the Properties of Polymer Composites

Georgescu¹,

Alexandrescu²,

Sönmez³

et al. 2017

LFJ

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ABSTRACT. Thermoplastic polymers are materials of the future, with special properties, depending on the type of elastomer, the degree of reinforcement, the type of reinforcement material, the functionalization of the reinforcing material, the type of functionalization agent, the elastomer-compatibiliser-reinforcing agent ratio, etc. Polycarbonate (PC) and polyamide (PA) are two elastomers with high hardness, immiscible due to differences in polarity, processing temperature, and solubility. These factors lead to a poor dispersion of PC in the PA matrix and vice versa. Mechanical and physical properties of these polymer blends come not only from the combination of polymeric compounds, but also from the developed morphological forms (interface). Therefore, an additive is required to act as a compatibiliser able to effectively reduce elastomer viscosity. In order to observe the influence of the selected compatibiliser on the properties of polymer composites, the latter were characterized physico-mechanically and morphologically. Thus, compatibilisers chosen for this study were polycaprolactone and polyalkyloxazoline. These compatibilisers, with specific surface and free energy, intervene in polymer-polymer interactions, increasing compatibility, forming polymer-compatibiliser-polymer bonds. Considering these properties formulations of polymercompounds were established (P1-P13) based on polyamide/compatibiliser/polycarbonate/fibreglass. Tested polymer composites contain different percentages of polyamide and polycarbonate (90, 70, 50, 30,10), compatibiliser (caprolactone and oxazoline) 3-7%, and 10-30% fibreglass. KEY WORDS: composites, polymers, polyamide, polycarbonate, compatibilisers INFLUENŢA AGENTULUI DE COMPATIBILIZARE ASUPRA CARACTERISTICILOR COMPOZITELOR POLIMERICEREZUMAT. Materialele polimerice termoplaste sunt materiale de viitor, având proprietăţi speciale, în funcţie de tipul de elastomeri, gradul de armare, tipul de material de armare, funcţionalizarea materialului de armare, tipul de agent de funcţionalizare, raportul elastomer-agent de compatibilizare-agent de armare etc. Policarbonatul (PC) şi poliamida (PA) sunt doi elastomeri cu duritate mare, nemiscibili datorită diferenţelor de polaritate, temperatură de prelucrare şi solubilitate. Aceşti factori conduc la o slabă dispersie a PC în matricea de PA şi invers. Proprietăţile mecanice şi fizice ale acestor amestecuri polimerice nu provin doar de la combinaţia de compuşi polimerici, ci şi de la formele morfologice dezvoltate (interfaţă). Prin urmare, este necesar un aditiv care să acţioneze ca un compatibilizator capabil să reducă în mod eficient viscozitatea elastomerilor. În vederea observării influenţei compatibilizatorului ales asupra proprietăţilor compozitelor polimerice, acestea au fost caracterizate din punct de vedere fizico-mecanic şi morfologic. Astfel, compatibilizatorii aleşi pentru acest studiu au fost policaprolactona şi polialchiloxazolina. Aceşti compatibilizatori, cu suprafaţă specifică şi energie liberă, intervin în interacţiunile po...

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Extensional and complex viscosities of linear and branched polycarbonate blends

Cited by 17 publications

References 7 publications

Mechanical strengths of molten and solidified LLDPE/LDPE blends and wood/LDPE composites under tensile deformation

Mechanical strengths of molten and solidified LLDPE/LDPE blends and wood/LDPE composites under tensile deformation

Thermally resistant polymer composites reinforced with fibreglass

The Influence of Compatibiliser on the Properties of Polymer Composites

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