Physical gelation in ethylene–propylene copolymer melts induced by polyhedral oligomeric silsesquioxane (POSS) molecules

Fu, Bruce X.; Gelfer, Michael; Hsiao, Benjamin S.; Phillips, Shawn H.; Viers, Brent D.; Blanski, Rusty L.; Ruth, Patrick N

doi:10.1016/s0032-3861(03)00018-1

Cited by 164 publications

(144 citation statements)

References 24 publications

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“…A wide variety of studies have been carried out on POSS-containing copolymers and POSS-homopolymer blends [9], probing their thermal [10][11][12][13][14][15][16][17], morphological [10,13,14,[17][18][19][20][21][22][23][24][25], mechanical [21,23,24,26,27], and selfassembly [10,28] properties. The rheological behavior of POSS-filled homopolymers has been studied by us [13] and by others [29]. In both cases, the POSS filler tended to phase separate into microcrystallites, even at loadings as small as φ = 0.01.…”

Section: Introductionmentioning

confidence: 97%

Miscibility and viscoelastic properties of acrylic polyhedral oligomeric silsesquioxane–poly(methyl methacrylate) blends

Kopesky¹,

Haddad²,

McKinley³

et al. 2005

Polymer

154

115

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Section: Introductionmentioning

confidence: 97%

Miscibility and viscoelastic properties of acrylic polyhedral oligomeric silsesquioxane–poly(methyl methacrylate) blends

Kopesky¹,

Haddad²,

McKinley³

et al. 2005

Polymer

154

115

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“…Furthermore the influence of the to the dispersal of POSS molecules in the polymer matrix which retards the molecular motion of the chains and hence, decreases crystal growth. Fu [18] also investigated the physical gelation in ethylene-propylene (EP) copolymer-POSS melts. Blends of 10% wt fraction, gave POSS aggregates due to POSS-POSS interactions which dominated the rheological behaviour of the polymer.…”

Section: Introductionmentioning

confidence: 99%

“…T 8 (nalkyl) 8 cage systems were synthesized where the length of the alkyl-chain group is C n H 2n+1 , and n = 8, 12 and 18. Herein, these will be referred to as T 8 C n cages were C n is: C 8 , C 12 , and C 18 . The structures of the three POSS cages with increasing alkyl-chain length are given in …”

Section: Introductionmentioning

confidence: 99%

Morphology and crystallization kinetics of polyethylene/long alkyl-chain substituted Polyhedral Oligomeric Silsesquioxanes (POSS) nanocomposite blends: A SAXS/WAXS study

Heeley

Hughes

Aziz

et al. 2014

European Polymer Journal

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The dispersal, quiescent crystallization kinetics and morphology of a series of unique polyethylene -polyhedral oligomeric silsesquioxanes (PE-POSS) nanocomposite blends is presented. POSS molecules with long linear alkyl-chain substituents were blended at one composition into a commercial low density polyethylene. Time-resolved Small-and WideAngle X-Ray scattering (SAXS/WAXS) and thermal techniques were used to elucidate the affect that POSS and its substituent groups have on the dispersal and crystallization kinetics of the host polymer. The miscibility and dispersal of the POSS molecules was seen to increase with the increasing alkyl-chain length substituents suggesting increased compatibility and interaction with the host polymer chains. The POSS molecules act as nucleating agents increasing the crystallinity, crystallization kinetics and influencing the final lamellar morphology. Thus, these unique POSS compounds show great potential as nancomposite filler particles in polyolefins where the alkyl-chain substituent plays a vital role in its compatibility and subsequent improvement of physical properties in the host polymer.

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“…In particular, in situ copolymerization of POSS to produce hybrid organic-inorganic polymers with pendent POSS groups has been widely studied both for thermoplastics and thermosets [10][11][12]. On the other hand, melt blending was also widely studied, this process being very appealing, economic and environmentally friendly [13,14]. Nevertheless, the dispersion of POSS into polymers by simple melt mixing is not obvious and requires the strict control of the balance between polymer-POSS interactions and POSS-POSS self-interactions.…”

Section: Introductionmentioning

confidence: 99%

On a novel method to synthesize POSS-based hybrids: An example of the preparation of TPU based system

Monticelli

Fina²,

Cavallo³

et al. 2013

Express Polym. Lett.

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Abstract.A novel method to prepare polymer/polyhedral oligomeric silsesquioxanes (POSS) hybrids by melt reactive blending is proposed in this paper, by the controlled polymer chain scission and reaction of chain ends with functional silsesquioxanes. Application to thermoplastic polyurethanes (TPU) is addressed, taking advantage of the polyurethane chain scission equilibrium reaction, leading to the formation of highly reactive isocyanate and hydroxyl chain ends. Despite the isocyanate chemistry has been widely studied for the preparation of polymer/POSS hybrids by in situ copolymerisation, the exploitation of similar chemical processes in an industrially viable and environmental friendly melt blending process is currently an open research field. In this work, the reaction in the molten state of dihydroxyl-functionalised POSS with the polyurethane chain is demonstrated to produce a TPU/POSS hybrids. The effect of POSS concentration on nanomorphology, thermal properties and surface properties is studied, showing significant changes compared to pristine TPU. In particular, an increase of glass transition temperature is observed in the presence of reactive POSS (!T up to about 10°C in the presence of 10 wt% loading). Furthermore, an increase of surface water wettability, evidenced by the decrease of water contact angle from 95° for pristine TPU to 70° in TPU containing 10"wt% of reactive POSS, is found.

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Physical gelation in ethylene–propylene copolymer melts induced by polyhedral oligomeric silsesquioxane (POSS) molecules

Cited by 164 publications

References 24 publications

Miscibility and viscoelastic properties of acrylic polyhedral oligomeric silsesquioxane–poly(methyl methacrylate) blends

Miscibility and viscoelastic properties of acrylic polyhedral oligomeric silsesquioxane–poly(methyl methacrylate) blends

Morphology and crystallization kinetics of polyethylene/long alkyl-chain substituted Polyhedral Oligomeric Silsesquioxanes (POSS) nanocomposite blends: A SAXS/WAXS study

On a novel method to synthesize POSS-based hybrids: An example of the preparation of TPU based system

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