Molau test

PA-6/EPDM/EPDM-g-MA Mechanical properties/SEM morphology/DSC/ Molau test/best properties at 80-10-10 ratio Xu et al. 2013b... 

PA-6/polyolefin elastomer/ PO elastomer-g-MA Mechanical properties/morphology/Molau test/ MA grafted through ultrasound-assisted extmsion/comparison of blend properties to those containing PO with MA grafted using peroxide Xie et al. 2010... 

PA-6 (60)/PE-f-(10-undecenoic acid) (40) TSE/morphology/mechanical properties/ Molau test/FTIR/f-PE synthesized using metallocene catalyst/also used 10-undecen-l-ol or N-methyl-lO-undecenylamine Anttila et al. 1999... 

PA-6/LX)PE-g-GMA (3.5 wt% GMA) Internal mixerAorque rheometry/SEM/DSC/ FTIR/Molau test/GMA grafting with additimi of styrene monomer in presence of peroxide/ comparison to blends with unfimctionalized LDPE Wei et al. 2003... 

PA-6/polyepichlorohydrin Banbury mixer/rheology/TEM/diffuse reflectance IR/Molau test/X-ray Da Costa et al. 1999 Da Costa and... 

Poly(lactic acid)/ethylene-octene copolymer-g-GMA (>10 wt%) Mechanical properties/FTIR/ Molau test/morphology/critical interparticle distance of dispersed domains Feng et al. 2013a... 

PET/EP-g-GMA Internal mixer/rheology/SEM/ DMA/FTIR/Molau test/EP functionalized with GMA in the presence of trimethylol propane triacrylate/comparison to blends containing unfunctionalized EP or EP functionalized with GMA in absence of triacrylate Al-Malaika and Kong 2005... 

Poly(ethylene-octene) Copolymer/PLA Blends Poly(ethylene-octene) copolymer, a thermoplastic polyolefin elastomer (TPO), was melt blended with PLA at a ratio of 20/ 80 wt% [10]. The difference in polarities of the two polymers led to thermodynamic immiscibility and phase separation of the final blends as determined by the Molau test. Therefore, a copolymer of TPO-gra//-PLA (TPO-PLA synthesized via functionalization of TPO and MA with benzoyl peroxide (BPO), followed by esterification of the MA-functionalized TPO (TPO-MAH) with PLA using 4-dimethylaminopyridine (DMAP) as a catalyst) was introduced to improve the compatibility of the TPO/PLA blends. The use of 5 wt% TPO-... 

A low density polyethylene sample with different degree of photooxidation (see Table 1) was blended with nylon 6 (LDPE 25 wt%). The resrdts of the Molau test are shown in Figure 1. The solution is clear in the case of blend PEPhO/Ny. The solution consists of nylon 6, which is soluble in formic acid. The upper part of the same test tube is a suspension of polyethylene particles. The tests regarding blends containing photooxidized polyethylenes show, on the contrary, an increasing and persistent turbidity which represents a suspension of colloidal particles. 

Figure 1. Molau test. Prom left to right ...

Figure 5. Molau test. From left to right V/Ny, Rl/Ny, R2/Ny prepared by melt extrusion.

As the degradation degree of the polyethylene rises, the suspension turbidity also increases. The R2 sample has a larger amount of C=0 groups and thus its blend shows a more intense turbidity. The results of Molau test of R2/Ny blend, prepared by extrusion and melt mixing, are reported in Figure 6. The blend prepared by melt mixing shows a more intense turbidity. 

The influence of a composition was tested for blend, having 80 wt% polyethylene. The Molau test (Figure 6) shows that at the low content of nylon, no turbidity is observed. 

The Molau test [40] for polymer-organomontmorillonite compatibility was performed by dispersing the nylon-organomontmorillonite composites in formic acid. The nylon and the organomontmorillonite demonstrated excellent compatibility with one another. This is consistent with the work above, which successfully produced exfoliated organomontmorillonite in nylon 6. 

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