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Polypropylene/polypropylene‐grafted acrylic acid blends for multilayer films: Preparation and characterization
Author(s) -
FloresGallardo S. G.,
SánchezValdes S.,
De Valle L. F. Ramos
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/1097-4628(20010222)79:8<1497::aid-app170>3.0.co;2-3
Subject(s) - polypropylene , contact angle , materials science , polymer chemistry , styrene , comonomer , acrylic acid , wetting , polymer blend , chemical engineering , fourier transform infrared spectroscopy , crystallization , polymer , monomer , copolymer , composite material , engineering
Polypropylene (PP) was functionalized with acrylic acid (AA) and styrene (st) as a comonomer by means of a radical‐initiated melt‐grafting reaction. FTIR, ESCA, and 1 H‐NMR spectroscopies were used to characterize the formation of polypropylene grafted with acrylic acid (PP‐ g ‐AA) and polypropylene grafted with acrylic acid and styrene (PP‐ g ‐AAst). The content of AA grafted onto PP was determined by using volumetric titration. Blends of PP with 0–100 wt % of PP‐ g ‐AA were prepared by melt mixing. The effect of the modified polymer content on the surfaces of cast films was characterized through FTIR–ATR and ESCA analysis as well as contact‐angle, wetting‐tension, and ink‐adhesion measurements. The influence of the content of AA on the melting and crystallization temperature of PP was investigated by DSC. The contact angles of water on cast‐film surfaces of PP/PP‐ g ‐AA blends decreases with increasing modified polymer content and decreasing PP‐ g ‐AA molecular weight. A notorious improvement on wetting tension was observed with increasing modified polymer content and decreasing PP‐ g ‐AA molecular weight. From FTIR–ATR and ESCA spectra of the blends, a calculation was made of the carbonyl index on the films' surfaces. It was found that the higher the carbonyl index, the lower the contact‐angle value for the polypropylene blends. An increase in crystallization temperature of PP was observed when AA monomers were grafted into PP and with increasing PP‐ g ‐AA content in the blend, probably caused by a nucleation effect of AA monomers that would improve the crystallization capability of PP. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 79: 1497–1505, 2001