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Polyolefins with POSS

  • M. PracellaEmail author
Chapter
Part of the Springer Series on Polymer and Composite Materials book series (SSPCM)

Abstract

The influence of POSS structure and mixing processes on the structural and morphological characteristics, and the thermal, mechanical and rheological behaviour of polyolefin/POSS nanocomposites have been reviewed in the present chapter. POSS molecules ([RSiO1,5]p) with various organic substituents (R), both of non-reactive and reactive type, have been examined. In particular, the properties of systems with polyethylene, polypropylene or ethylene–propylene copolymer matrix (HDPE/POSS, LDPE/POSS, PP/POSS, EP/POSS), and vinyl polymers (PS/POSS), containing linear and branched alkyl-substituted POSS have been analysed at various compositions and preparation conditions. The studies indicated that the length of alkyl groups on POSS molecules plays a fundamental role in determining the POSS dispersion degree in the polymer matrix during the melt mixing process, as well as the crystallization, thermal and mechanical behaviour of these composites. Then, the properties of binary and ternary systems containing polyolefin grafted with reactive groups (such as PP-g-MA) and POSS functionalized with amino groups (am-POSS)—able to induce grafting reactions of POSSs on the polymer chains in melt mixing—have been reported. It was demonstrated that the grafting promotes the compatibilization of the nanocomposites, increasing POSS dispersion up to molecular level and improving mechanical and thermal resistance. Moreover, the isothermal and non-isothermal crystallization processes and the crystalline morphology of polyolefin/POSS systems have been analysed with the aim of investigating the nucleation activity of POSS nanoparticles on the crystal growth and the overall crystallization kinetics of the polyolefin matrix.

Keywords

Polymer composites Polyolefins Polysilsesquioxanes Morphology Thermal behaviour Mechanical properties Reactive mixing 

Nomenclature

EP

Ethylene–propylene copolymer

HDPE

High-density polyethylene

LDPE

Low-density polyethylene

PEO-b-PE-POSS

Polyethylene oxide-polyethylene-POSS triblock copolymer

PET

Polyethylene terephthalate

PIBMA

Poly(isobutyl methacrylate)

PMMA

Poly(methylmethacrylate)

PMMA-b-PMAPOSS

Polymethylmethacrylate-polymethacrylate POSS block copolymer

PP

Isotactic polypropylene

PP-g-MA

Maleic anhydride-grafted PP

PP-g-POSS

POSS-grafted PP

PS

Polystyrene

PA

Polyamide

PC

Polycarbonate

PS-b-PMAPOSS

Polystyrene-polymethacrylate POSS block copolymer

am2b-POSS

Aminoethyl-aminopropyl-heptaisobutyl-POSS

amb-POSS

Aminopropyl-heptaisobutyl-POSS

amo-POSS

Aminopropyl-heptaisooctyl-POSS

heptacyclopentyl-POSS

4,4′-Bis(heptacyclopentyl-T8-silsesquioxyl)phenyl ether

me-POSS

Methyl-POSS

oap-POSS

Octaaminophenyl-POSS

OIB-POSS

Octaisobutyl-POSS

OIO-POSS

Octaisoctyl-POSS

OM-POSS

Octamethyl-POSS

ph-POSS

Phenyl-POSS

POSS18

n-Octadecyldimethylsiloxy-POSS

POSS7b

4-Methyl-hexyldimethylsiloxy-POSS

POSS8

n-Octyldimethylsiloxy-POSS

POSS-NH2

Amino-POSS

vi-POSS

Vinyl-POSS

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Copyright information

© Springer Nature Switzerland AG 2018

Authors and Affiliations

  1. 1.National Research Council, Institute for Physical and Chemical Processes, c/o Department of Civil EngineeringUniversity of PisaPisaItaly

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