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Molecular interactions at the interface in blends of ester groups‐functionalized polyolefins
Author(s) -
Aglietto M.,
Benedetti E.,
Ruggeri G.,
Ciardelli F.,
Pracella M.,
D'Alessio A.
Publication year - 1995
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19950980198
Subject(s) - miscibility , materials science , polymer , surface modification , copolymer , polymer chemistry , polyethylene , functional polymers , polymer blend , linear low density polyethylene , intermolecular force , chemical engineering , organic chemistry , molecule , chemistry , composite material , engineering
Due to the apolarity of the aliphatic backbones, unmodified polyolefins are scarcely miscible with most of other polymers. The functionalization of preformed polyolefins is a way which has been successfully followed to improve the polymer miscibility. The functionalization of linear low density polyethylene (LLDPE) and ethylene‐propylene copolymers (EP), with diethyl maleate (DEM) and dicumyl peroxide (DCP) as radical initiator, gives products containing up to 2–5 mol % of well defined functional groups (2‐diethyl succinate). Intermolecular interactions of these functional groups are characterized by comparison with suitable low‐molecular‐weight structural models in the presence of different solvents containing acidic hydrogen atoms. On the basis of these indication evidences of interface molecular interactions in blends with halogenated polymers are described between the functionalized polyolefins and poly(vinyl chloride) (PVC), poly(vinylidene fluoride) (PVDF) or vinylidene fluoride‐hexafluoropropene copolymer obtained in semiindustrial Brabender mixers. It is shown that a smooth functionalization of the polyolefins can modify the phase behaviour and structure of these systems. The FT‐IR microanalysis supports the occurrence of partial miscibility phenomena which can be accounted for by specific intermolecular interactions involving the inserted functional groups and occurring mainly at the interfaces between domains of polyolefins and of the halogen‐containing polymers.