Thermal and rheological effects of sepiolite in linear low‐density polyethylene/starch blend

Mir, Sadullah; Yasin, Tariq; Halley, P. J.; Siddiqi, Humaira M.; Özdemir, Orhan; Nguyen, Anh V.

doi:10.1002/app.37657

Cited by 23 publications

(9 citation statements)

References 27 publications

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“…Blends of polyolefins with other biopolymeric renewable resources viz. starch, chitin, chitosan, cellulose, and their derivatives have also been studied , but these are water wettable or water swellable and to be technologically useful, they have to be made less hydrophilic with sacrifice of biodegradation rate . Another major disadvantage of blending natural biodegradable polymer with the conventional ones is their incompatibility, which results in the poor interaction between them causing inferior mechanical properties .…”

Section: Introductionmentioning

confidence: 99%

Blends of high density polyethylene and poly(l‐lactic acid): Mechanical and thermal properties

Madhu

Bhunia

Bajpai

2013

Polymer Engineering & Sci

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The blends of high‐density polyethylene (HDPE) and poly(l‐lactic acid) (PLLA) were prepared by melt blending method in an extrusion mixer with a postextrusion blown film attachment. The ratios of HDPE/PLLA blends were taken as 100/0, 95/5, 90/10, 85/15, and 80/20. The 80/20 blend was further compatibilized by adding maleic anhydride‐grafted polyethylene in different ratios (up to 8 wt%). Based on the mechanical properties of the films, the compositions HDPE80 (80% HDPE and 20% PLLA) and HD80C4 (80% HDPE, 20% PLLA, and 4% compatibilizer) were found to be optimum and considered for further analysis. The thermal properties of these selected blends were investigated by means of thermogravimetric analysis (TGA) and differential scanning calorimetry (DSC). TGA study revealed that the addition of the PLLA somewhat decreased the thermal stability of HDPE. DSC investigation showed that the blends were partially miscible only. X‐ray diffraction (XRD) analysis enlightened that the crystallinity of blends was slightly increased with addition of PLLA. Immiscibility of the two polymers was diminished in the presence of compatibilizer, as indicated by the scanning electron microscopy (SEM) of the blends. These partially biodegradable blends may be used for flexible packaging applications. POLYM. ENG. SCI., 54:2155–2160, 2014. © 2013 Society of Plastics Engineers

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Section: Introductionmentioning

confidence: 99%

Blends of high density polyethylene and poly(l‐lactic acid): Mechanical and thermal properties

Madhu

Bhunia

Bajpai

2013

Polymer Engineering & Sci

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“…On the other hand, two factors affect the storage modulus: the number of oriented chain segments will increase obviously as the shear rate increases and, simultaneously, the oriented chain segments will have less time for disorientation 31 . Therefore, at high frequencies, entangled chains have a short time to relax and increase the amount of storage modulus 32 . It was also observed that the storage modulus (G') and the loss modulus (G'') increase with an increasing weight percentage of HDPE and TS in the blends.…”

Section: Elasticitymentioning

confidence: 99%

Investigation of physical and rheological properties of LDPE/HDPE/thermoplastic starch biodegradable blend films

Zeraatpishe

Hassanajili

2022

Preprint

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In this work, low-density polyethylene/high density polyethylene/thermoplastic starch (LDPE/HDPE/TS) films were prepared with different compositions to obtain environmentally friendly materials. LDPE/HDPE/TS blends, at ratios of 95:5:15, 90:10:15, 85:15:15, 85:15:20, 85:15:25 and 85:15:30, were processed into thin films by single-step single-screw extrusion. Fourier transform infrared (FTIR) spectra confirmed the immiscibility of matrices and TS in the blend, also in the SEM micrographs of the films no miscibility between the PE and starch was observed. in addition, the SEM micrographs showed a fairly good dispersion of TS (at low wt%) in the blend. Differential scanning calorimetry (DSC) analysis depicted an increase in the percentage of crystallinity with increasing HDPE and a decrease in the percentage of crystallinity with increasing TS. With the increase of HDPE content at low wt% of TS in the blend, an improvement was obtained in oxygen barrier property of the prepared films when compared to LD film. Water absorption of the samples decreased to some extent with increasing HDPE and the absorption increased with increasing TS. The rheological properties of LDPE/HDPE/TS blends were investigated before and after biodegradation. Results were fitted with well-known rheological models to achieve more valuable data about the effect of the composition as well degradation condition on the blend property. By adding HDPE in the presence of TS, rheological properties close to the LDPE were obtained for LDPE/HDPE/TS samples.

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“…Škrob djeluje kao kruto raspršena faza i smanjuje fleksibilnost lanca PE-LD-a pri većem udjelu TPS-a, što dovodi do smanjenja stupnja kristalnosti. 20 Također, to objašnjenje povezano je i sa strukturom PE-LD-a, odnosno njegovim dugačkim razgranatim lancima koji uzrokuju uplitanje lanaca taljenjem i onemogućavaju utjecaj TPS-a, i to izraženije pri većem udjelu TPS-a. Također se uočava da su entalpije kristalizacije i entalpije taljenja (tablica 1) za PE-LD/TPS mješavine različite, odnosno manje su u fazi zagrijavanja nego hlađenja.…”

Section: Uzorak Sampleunclassified

Toplinska i mehanička svojstva mješavina na bazi termoplastičnog škroba

2018

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U ovom radu pripremljene su mješavine na osnovi polietilena niske gustoće (PE-LD) i termoplastičnog škroba (TPS) s ciljem dobivanja biorazgradljivog polimernog materijala za primjenu kao ambalažnog materijala. Provedena je karakterizacija toplinskih, mehaničkih svojstava kao i propusnost vodene pare zbog izrazitog hidrofilnog karaktera škroba. Dodatak TPS-a u PE-LD/TPS mješavinama utječe na porast stupnja kristalnosti do udjela od 20 mas. % zbog nukleacijskog učinka TPS-a. Prekidno naprezanje i prekidno istezanje smanjuju se porastom udjela TPS-a u PE-LD/TPS mješavinama, dok modul elastičnosti raste. Temperatura početka razgradnje pomiče se na niže temperature, što ukazuje na smanjenje toplinske stabilnosti PE-LD-a dodatkom TPS-a. Glicerol kao plastifikator škroba utječe na povećanje toplinske stabilnosti škroba, no pokazuje negativan učinak na propusnost vodene pare.Biorazgradljivi materijali, polietilen niske gustoće, termoplastični škrob, toplinska svojstva, mehanička svojstva, propusnost vodene pare

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Thermal and rheological effects of sepiolite in linear low‐density polyethylene/starch blend

Cited by 23 publications

References 27 publications

Blends of high density polyethylene and poly(l‐lactic acid): Mechanical and thermal properties

Blends of high density polyethylene and poly(l‐lactic acid): Mechanical and thermal properties

Investigation of physical and rheological properties of LDPE/HDPE/thermoplastic starch biodegradable blend films

Toplinska i mehanička svojstva mješavina na bazi termoplastičnog škroba

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