Fundamentals of structure–property relationships in blown films of linear low density polyethylene/low density polyethylene blends

Patel, Rajen M.; Karjala, Thomas W.; Savargaonkar, Nilesh; Salibi, Philip; Liu, Lizhi

doi:10.1177/8756087919844303

Cited by 13 publications

(11 citation statements)

References 27 publications

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“…[2] Addition of LDPE to LLDPE results in melt strength enhancement, generally reaching a maximum as hypothesized in Reference [1] when the LLDPE concentration in LDPE is low, in this case at about 80% LDPE in LLDPE. Others have shown this melt strength synergy to also be correlated with orientation, [1,3] tear strength, [1] and relaxation time. [3] Several studies have also correlated rheological properties such as melt strength of the LDPE or LLDPE/LDPE blend [9][10][11][12][13] as well as elongational viscosity [14] and analytical methods in general [15] to improved blown film output and bubble stability.…”

Section: Introductionmentioning

confidence: 73%

“…In particular, the rheology of LLDPE/LDPE blends has been an active area of study, with a focus on the synergistic behavior of the blend, resulting in many cases in improved melt strength, processability, and bubble stability over that of the LLDPE or LDPE alone. [1][2][3][4][5][6] As initially discussed in Reference [2] and further reviewed in Reference [1], LLDPE/LDPE melt strength synergy can be explained through the Bersted model [7,8] and the effects of long chain branching on the low or zero shear viscosity of polyethylenes. For melt strength synergies, a mixture of linear and branched molecules of similar molecular weights is preferred.…”

Section: Introductionmentioning

confidence: 99%

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Rheology modifier additive for enhanced processability of polyethylene forblown‐Filmapplications

Williamson¹,

Gomes

Karjala³

et al. 2022

Vinyl Additive Technology

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Polyethylene is a versatile polymer suitable for a large variety of flexible and rigid packaging applications. Its mechanical and rheological properties can be tuned across a wide range by controlling its molecular architecture, such as the amount and distribution of olefinic comonomers (short chain branching), long chain branching, and molecular weight distribution. Linear low‐density polyethylene (LLDPE) is known for its high toughness which enables downgauged film structures and low‐density polyethylene (LDPE) is known for its excellent shear thinning and melt strength which enables enhanced processability and high throughput, such as on blown film lines. In order to obtain a balance of toughness and processability on films produced on blown film lines, blends of LLDPE and LDPE are commonly used. In this paper, we describe additive‐based approaches, including a new product, DOWLEX™ (TM = trademark of the Dow Chemical Company (“Dow”) or an affiliated company of Dow) GM AX01, which enhances melt strength and other rheological properties of polyethylene, enabling fabrication of films with lower LDPE content while still maintaining excellent rheological properties and higher toughness versus conventional LLDPE/LDPE blends. The higher toughness enables downgauging without loss of mechanical properties, which in turn reduces consumption of polymer resulting in a more sustainable solution.

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Section: Introductionmentioning

confidence: 73%

Section: Introductionmentioning

confidence: 99%

Rheology modifier additive for enhanced processability of polyethylene forblown‐Filmapplications

Williamson¹,

Gomes

Karjala³

et al. 2022

Vinyl Additive Technology

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show abstract

“…The compatibility of PE and PP is good due to their similar solubility and surface tension, which can improve the environmental stress cracking resistance of PE. Different types of PE blending can make the two resins complementary in performance, such as LDPE and HDPE blending, not only can improve the processing properties of HDPE, but also can improve the impact toughness and environmental stress cracking resistance of HDPE [24,25]. PP / POE / PE blend modified, cheap PE can replace the new thermoplastic elastomer POE, ternary blend PP / POE / PE has good rigidity and impact strength, the cost is also much lower.…”

Section: Blending Modificationmentioning

confidence: 99%

A comprehensive review of synthesis, properties and modification of several common polyethylenes

Dai

Meng

et al. 2023

Eighth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2022)

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Polyethylene (PE) has good chemical stability and corrosion resistance and is one of the top five synthetic resins, widely used in the manufacture of films and fibers. However, with the development of society, simple PE products can no longer meet people's demands for performance. This article describes the performance, production methods, and several methods and effects of PE modification of different kinds of PE. The performance of PE is related to the way it is processed and the length of its branches and the number of branches. The shorter the length of the branch chain, the less the number of long branch chains and short branch chains, the higher the density, the stronger the crystallinity, the higher the tensile strength, the tensile modulus, and hardness, and the higher the melting point. The larger the molecular weight, the more branched chains, the tighter the entanglement between the molecular chains, and the greater the viscosity of the material. The fewer the branch chains, the shorter the length of the branch chains, and the lower the pressure and temperature required for processing. In the third part, this article describes the enhanced interface compatibility of materials, improved processing properties, reduced costs, and improved mechanical properties such as compliance and stress cracking by physical modification (blending modification, filling modification, enhanced modification) and chemical modification (crosslinking modification, graft modification, copolymerization modification). It also describes new modified technologies such as metallocene catalysis and nanomaterial filling that improve material properties while becoming more environmentally friendly. This paper expects to be able to develop PE materials that meet social needs based on the specific properties of PE and the way of modification, guided by different needs for materials.

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“…Polypropylene (PP) is a polymer available at low cost that has excellent thermal stability, optical transparency, and barrier properties [ 4 ]. Linear low-density polyethylene (LLDPE) provides a high barrier to gases and has high processing adaptability to various shapes of food packaging [ 5 , 6 , 7 ]. It is often used for production of thinner plastic films.…”

Section: Introductionmentioning

confidence: 99%

Effect of Ultrasound Treatment on Barrier Changes of Polymers before and after Exposure to Food Simulants

et al. 2022

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In this study, we investigated the impact of ultrasound treatment on barrier properties of linear low-density polyethylene (LLDPE) and acrylic/poly(vinylidene chloride) polypropylene (PPAcPVDC) - coated pouches intended for food packaging before and after exposure to food simulants. Packaging pouches were filled with two food simulants, namely ethanol (10% [v/v]) and acetic acid (3% [w/v]), in order to simulate food–packaging interaction and possible compound migration from packaging materials. Samples were subjected to an ultrasound water bath treatment for 5 min, 15 min, and 30 min at 60 °C (±2 °C) and with an amplitude of 100% as an equivalent to the heat-treatment conditions combined with an ultrasound effect. Furthermore, the effect of temperature on the polymer barrier (water vapour and oxygen permeability) properties was tested at 20 °C, 40 °C, and 60 °C. Results showed that PPAcPVDC possessed better properties of water vapour permeability and oxygen permeability properties to LLDPE. Statistical analyses showed a significant (p < 0.001) impact of ultrasound treatment on the overall migration value, regardless of the food simulant used.

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Fundamentals of structure–property relationships in blown films of linear low density polyethylene/low density polyethylene blends

Cited by 13 publications

References 27 publications

Rheology modifier additive for enhanced processability of polyethylene forblown‐Filmapplications

Rheology modifier additive for enhanced processability of polyethylene forblown‐Filmapplications

A comprehensive review of synthesis, properties and modification of several common polyethylenes

Effect of Ultrasound Treatment on Barrier Changes of Polymers before and after Exposure to Food Simulants

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