ULDPEUltra Low Density Polyethylene
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(wt%) C/ sup.3]) 2.16 kg) LDPE (503) ExxonMobil 2.3 0.919 -- LLDPE Nova 1 0.920 Octene (FP120) Chemicals ULDPE Dow Chemical 1 0.912 Octene Attane (14.9%)[10] 4201 Exact 3132 ExxonMobil 1.2 0.90 Hexene (15.4%) [11] Exact 8201 ExxonMobil 1.1 0.882 Octene (28%) [12] Affinity Dow Chemical 1 0.908 Octene (9.5%) 1840 [13] Affinity Dow Chemical 7.5 0.902 Octene (13.8%) 1450 [14] (a.) In this paper we mention these materials as LD, LLD, 4201, 3132, 8201, 1840, and 1450 to simplify the resin name and code Rheological Characterization
NOMENCLATURE D ratio of the absorbance G' elastic modulus (Pa) G" loss modulus (Pa) Greek Symbols [[eta].sup.*] complex viscosity (Pa s) [[eta] E.sup.+] transient elongational viscosity (Pa s) [omega] angular frequency (rad/s) [lambda] characteristic elastic time Abbreviations CG constrained geometry DMTA dynamic mechanical thermal analyzer DR draw ratio FLH frost line height HDPE high-density polyethylene LCB long chain branches LDPE low density polyethylene LLDPE linear low density polyethylene MD machine direction MFI melt flow index ULDPE Ultra low density polyethylene Z-N Ziegler-Natta REFERENCES
The Characterization of the functionalized polymers allowed observing that both ULDPE and SEBS were slightly degraded during the functionalization and that the functionalization degree of ULDPE-g-DEM, expressed as percentage by weight of grafted diethyl maleate, was higher than the SEBS-g-DEM on (Table 1).
Anyway, the functionalization with DEM of ULDPE modified more the interfacial tension values between it and LDPE than the modification of SEBS.
At the desired 80/20 SIS/ULDPE blend, the ULDPE particles were small and well dispersed.
ULDPE is characterized by having little or no long chain branches, but the comonomers employed create a significant number of short chain branches (SCB) on the main backbone chain.
The resin analyzed in this work is a commercially available (Dow Attane 4001) ultralow-density polyethylene (ULDPE), which is a copolymer of ethylene and 1-octene.
This increase with velocity was the largest for the ULDPE, LLDPE, and LDPE resins.
Like the effect of velocity on the coefficient, the ULDPE, LLDPE, and LDPE resins showed stronger dependencies with pressure as compared with the HDPE resins.
A comparison of Exceed 1012CA and Attane 4201 showed that though the ULDPE by itself has lower haze and higher gloss, adding 10% of either of two ExxonMobil LDPEs (7.5 and 0.75 MI) produced higher clarity and gloss with Exceed 1012CA than with Attane 4201.
* A new metallocene catalyzed, very-low-density polyethlyene (mVLDPE) from ExxonMobil Chemical Co., Houston, reportedly offers the excellent toughness associated with mLLDPE plus lower heat-seal temperatures and other advantages over conventional Ziegler-Natta VLDPEs or ULDPEs for flexible packaging.
A new metallocene VLDPE (mVLDPE) for flexible food and industrial packaging is said to be a cost-effective, premium-performance alternative to conventional ZieglerNatta VLDPE or ULDPE. Exceed 1012CA from ExxonMobil Chemical, Houston, has a density of 0.912 g'cc and 1.0 MI.