Silanols cured by borates as lubricants in extrusion of LLDPE. Impact of elasticity of the lubricant on sliding friction

Kulikov, O. L.; Hornung, Klaus; Wagner, Manfred H.

doi:10.1007/s00397-007-0171-1

Cited by 17 publications

(11 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The extensional properties of polymer melts play an important role in their processability [8] and therefore in the occurrence of sharkskin melt fracture due to stretching that occurs as the polymer melt exits the die [26–30]. Figure 2 depicts the tensile stress growth coefficient of both resins at different Hencky strain rates at T = 150°C.…”

Section: Resultsmentioning

confidence: 99%

“…This can also be seen from the critical shear rates and stresses for the onset of melt fracture at various temperatures listed in Table 3 for both polymers. Therefore, the processability of the two resins with similar rheology is distinctly different mainly due to the broadness of their MWD that influences their elasticity [29, 30].…”

Section: Resultsmentioning

confidence: 99%

“…The end result is an increase of the productivity as well as an energy cost reduction, while high product quality is maintained. The additives mostly used for polyolefin extrusion processes are fluoropolymers [29, 30, 52–54]. Amos et al [55] and Achilleos et al [56] have reviewed the formulation, applications, and performance of various processing aids.…”

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

Melt fracture of two broad molecular weight distribution high‐density polyethylenes

Ansari¹,

Hatzikiriakos²,

Sukhadia³

et al. 2011

Polymer Engineering & Sci

View full text Add to dashboard Cite

The melt fracture instabilities of two broad molecular weight distribution (MWD) high‐density polyethylenes (one Ziegler–Natta and one metallocene HDPEs) are studied as functions of the temperature and geometrical details and type of die (cylindrical, slit, and annular). It is found that sharkskin and other melt fracture phenomena are distinctly different for these resins, despite their almost identical rheology. It is also found that the critical conditions for the onset of various melt fracture phenomena depend significantly on the type of die used for their study. For example, sharkskin melt fracture in slit and capillary extrusion was obtained at much small critical shear stress values compared with those found in annular extrusion. Moreover, the metallocene HDPE shows significant slip at the die wall in the sharkskin flow regime. On the other hand, the Ziegler–Natta HDPE has shown no sign of slip. These differences are discussed on the basis of differences in their MWDs that influence their melt elasticity. POLYM. ENG. SCI., 2011. © 2011 Society of Plastics Engineers

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Melt fracture of two broad molecular weight distribution high‐density polyethylenes

Ansari¹,

Hatzikiriakos²,

Sukhadia³

et al. 2011

Polymer Engineering & Sci

View full text Add to dashboard Cite

show abstract

“…It is easy to vary the elasticity of the cured silanol fluid by employing different combinations of high and low molecular weight silanols and by varying the amount of borates and phosphoric acid. The impact of elasticity of the lubricant on the sliding friction and the efficiency to suppress melt fracture was investigated by Kulikov et al [2]. The efficiency to delay the onset of sharkskin and to lubricate is increasing with increasing elasticity of the cured silanols.…”

Section: Novel Polymer Processing Additivesmentioning

confidence: 98%

Impact of Elasticity on Lubrication. Esters of PEG, Silanol and their Blends as Polymer Processing Additives

Kulikov¹,

Hornung²,

Wagner³

2008

AIP Conference Proceedings

Self Cite

View full text Add to dashboard Cite

“…A wide variety of products is available (Hong et al, 1999;Liu and Li, 2005;Hatzikiriakos et al, 2005;Kulikov et al, 2007;Wang et al, 2008;Vega et al, 2011) but the most popular are fluoropolymer additives (Migler et al, 2001;Bigio et al, 2005;Dubrocq-Baritaud, 2008). After an induction time of about ten minutes, we observe a drop in pressure at the extruder head, and a progressive disappearance of the sharkskin defect ( Fig.…”

Section: Remedies and Solutionsmentioning

confidence: 99%

Extrusion Defects and Flow Instabilities of Molten Polymers

Vergnes

2015

International Polymer Processing

View full text Add to dashboard Cite

International audienceWhen certain critical conditions are exceeded, the flow of a polymer melt becomes unstable, giving rise to particular phenomena that are the subject of this review. These instabilities are a vital industrial problem, as they are the key to productivity of extrusion processes. Indeed, their onset leads to unacceptable products and is thus the upper limit of the processing conditions. They are also a fascinating scientific problem because, although studied and discussed for more than half a century, they are still not fully understood and their mechanisms are still sometimes controversial. In the present literature review, we present an overview of the studies carried out for fifty years, as well as our own opinion on the underlying mechanisms.3-2

show abstract

Silanols cured by borates as lubricants in extrusion of LLDPE. Impact of elasticity of the lubricant on sliding friction

Cited by 17 publications

References 38 publications

Melt fracture of two broad molecular weight distribution high‐density polyethylenes

Melt fracture of two broad molecular weight distribution high‐density polyethylenes

Impact of Elasticity on Lubrication. Esters of PEG, Silanol and their Blends as Polymer Processing Additives

Extrusion Defects and Flow Instabilities of Molten Polymers

Contact Info

Product

Resources

About