Middle Molecules and the 7 C Factor

Bergström, Jonas; Jörnvall, Hans; Zimmerman, Lena

doi:10.1007/978-1-4684-5445-1_3

Cited by 2 publications

(4 citation statements)

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“…Most of the studies on LDPE resins, however, have been mostly concerned with the improvement of its impact strength 9 -11 and adhesion properties. [2][3][4][5] The results of the chemical modification of LDPE resins with hexamethylene diisocyanate (HMDI) and toluene diisocyanate (TDI) with respect to improvement in OTR, water vapor transmission rate (WVTR), and grease resistance properties are reported in this article.…”

Section: Introductionmentioning

confidence: 99%

“…Although there are a few reports on the modification of polyethylene, [2][3][4][5] with regard to the improvement of adhesion, there is scant information available on modification aimed at the improvement of barrier properties. There are some reports on the modification of polyethylene with maleic anhydride and n-phenyl maleimide.…”

Section: Introductionmentioning

confidence: 99%

“…8 LDPE resins have been modified by reactions with carbonyl-functional unsaturated compounds. [2][3][4] The treatment of LDPE films with oleum and SO 3 8 has been carried out to decrease the OTR. Most of the studies on LDPE resins, however, have been mostly concerned with the improvement of its impact strength 9 -11 and adhesion properties.…”

Section: Introductionmentioning

confidence: 99%

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Crosslinking of low‐density polyethylene by diisocyanates for superior barrier properties

Raj

Jagadish

Srinivas

et al. 2005

J of Applied Polymer Sci

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ABSTRACT:The chemical modification of low-density polyethylene (LDPE) resins with hexamethylene diisocyanate and toluene diisocyanate was achieved. The reaction of LDPE with diisocyanate was monitored by Fourier transform infrared spectroscopy, wherein the appearance of new peaks at 3326, 1620, and 1572 cm Ϫ1 corresponding to ONOH stretching, O(CAO)ONH 2 stretching, and ONOH bending in an amide moiety, respectively, was observed. Modified films of excellent clarity and uniform thickness were obtained by the solution casting of crosslinked polyethylene. The oxygen transmission rate (OTR), water vapor transmission rate (WVTR), grease resistance, and thermal properties of the modified films were studied. The results clearly indicate that the OTR was improved by 35% and that grease resistance was improved by 90 -125% in the crosslinked LDPE films with little change in their strengths. The heat seal characteristics, however, showed that relatively higher temperatures were needed to achieve efficient sealing in these films. Differential scanning calorimetry showed a decrease in the melting temperature from 104°C for LDPE to 101°C for both of the crosslinked LDPE films.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Crosslinking of low‐density polyethylene by diisocyanates for superior barrier properties

Raj

Jagadish

Srinivas

et al. 2005

J of Applied Polymer Sci

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“…Compatibilizing systems with polyolefin have been studied by many researchers [4]. There are polyethylene (PE) and polypropylene (PP) [4,5], polyethylene (PE) and diene rubbers (NR) [6], polyethylene (PE) and polystyrene (PS) [7], polyethylene (PE) and polyesters [8,9], polyethylene (PE) and polyamides [10], and polyethylene (PE) and poly-(vinyl chloride) (PVC) [11]. Various types of graft copolymers (PE-g-PP, PE-g-NR, EP-g-PS, PE-g-anhydride) and block copolymers (hydrogenated polybutadiene-block-polyisoprene, PE-block-PS) were used to make compatibilization of their polyolefin blends.…”

Section: Introductionmentioning

confidence: 99%

Compatibilization of poly(vinyl chloride) with polyamide and with polyolefin by using poly(lauryllactam-random-caprolactam-block-caprolactone)

Kim¹,

White²

2005

J Vinyl Addit Technol

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The compatibilization of various poly(vinyl chloride) (PVC) blends was investigated. The blend systems were PVC-polyamide 12 (PA12), PVC-polypropylene (PP), and PVC-ethylene-propylene-diene rubber (EPDM) with a new compatibilizing agent, random-block terpolymer poly(-lauryllactam-random-⑀-caprolactam-block-⑀-caprolactone) or systems containing these copolymers. The results were compared to those obtained in previous studies using poly(-lauryllactam-block-⑀-caprolactone) copolymer. The new block copolymer was specially synthesized by reactive extrusion. Observation by scanning electron microscopy (SEM) revealed that compatibilized blends had a finer morphology than the noncompatibilized blends. Addition of 10 weight percent (wt%) of block copolymer proved to be sufficient to give a significant improvement of the mechanical properties of the immiscible PVC blends at room temperature and at high temperatures that were above the glass transition temperature of PVC. For polyolefins, a three-component compatibilizing system including maleated polypropylene, polyamide 12, and block copolymer was used. It was found that poly(-lauryllactam-random-⑀-caprolactam-block-⑀-caprolactone) was the more efficient compatibilizing agent for the modification of PVC-polyamide 12, PVC-polypropylene, and PVC-ethylene-propylene-diene rubber blends. J. VINYL ADDIT. TECHNOL., 11:95-110, 2005.

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Middle Molecules and the 7 C Factor

Cited by 2 publications

References 3 publications

Crosslinking of low‐density polyethylene by diisocyanates for superior barrier properties

Crosslinking of low‐density polyethylene by diisocyanates for superior barrier properties

Compatibilization of poly(vinyl chloride) with polyamide and with polyolefin by using poly(lauryllactam-random-caprolactam-block-caprolactone)

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