Crosslinking of low density polyethylene with octavinyl polyhedral oligomeric silsesquioxane as the crosslinker

Wu, Jianlin; Wu, Zi Liang; Yang, Hongmei; Zheng, Qiang

doi:10.1039/c4ra04886e

Cited by 31 publications

(23 citation statements)

References 49 publications

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“…It was reported in the literature that DCP acts as an initiator for grafting and cross-linking reaction in the presence of POSS molecules bearing a double bond, in particular activating the unsaturation of the reactive functional group of POSS. 29,30 Indeed, it is generally understood that peroxide abstracts hydrogen atoms from the PE chain and these radicals react with the olefin on POSS. In our case, we have to consider the reactivity of the allylic hydrogen of the allyl POSS: The energy required for the formation of allylic radicals on the allyl POSS is lower than that for the formation of secondary radicals on the PE.…”

Section: Resultsmentioning

confidence: 99%

“…The signal attributed to the double bond of the POSS structure in the POSS‐loaded systems suggests the presence of 1POSS only physically dispersed in the polymeric matrix, although the lower intensity of the signal can be related to the 1POSS ability to react with the polymeric matrix in DCP presence. It was reported in the literature that DCP acts as an initiator for grafting and cross‐linking reaction in the presence of POSS molecules bearing a double bond, in particular activating the unsaturation of the reactive functional group of POSS . Indeed, it is generally understood that peroxide abstracts hydrogen atoms from the PE chain and these radicals react with the olefin on POSS.…”

Section: Resultsmentioning

confidence: 99%

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POSS Grafting on Polyethylene and Maleic Anhydride‐Grafted Polyethylene by One‐Step Reactive Melt Mixing

et al. 2016

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ABSTRACT:This study reports the one-step reactive melt mixing preparation of organic-inorganic hybrid based on maleic anhydride-grafted polyethylene and 3-(2-aminoethyl)aminopropyl-heptaisobutyl substituted polyhedral oligomeric silsesquioxane, (NPOSS), as well as on low-density polyethylene and allyl-heptaisobutyl-POSS (1POSS) in dicumyl peroxide presence, which is believed to activate the unsaturation of the reactive functional group of POSS itself. The successful grafting of POSS molecules onto polymeric backbones was probed through rheological and spectroscopic analysis. Grafting of POSS molecules enhances their dispersion in the polymeric matrix as shown by morphological analysis. Moreover, the rheological analysis of the organic-inorganic hybrids reveals a solid-like behavior, due to the formation of a network related to the interactions between grafted POSS molecules. The homogeneous dispersion of POSS molecules along with the strong interaction between polymeric segments and the nanoparticles influences the calorimetric and mechanical properties of the obtained hybrids. C

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

POSS Grafting on Polyethylene and Maleic Anhydride‐Grafted Polyethylene by One‐Step Reactive Melt Mixing

et al. 2016

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“…Such presumption can be rationalized by the nucleation behavior during crystallization. Among the scenarios that suggested by Horst et al, 7 Acierno et al 8 and Coppola et al, 3 the direct contact between structural units are believed to be less possible. If the network is formed by the bridging molecules which have segments in neighboring crystalline phases, the relaxation time depends on the molecular weight of bridging segments (M s ).…”

Section: Critical Point Of Lstmentioning

confidence: 96%

“…Compared to other techniques, rheological methods have been demonstrated as sensitive tools to probe the subtle structure changes at the liquid-solid transitions (LST). 6 In the past decades, the gelation concept has been applied successfully to investigate the chemical-crosslinking [7][8][9] and the crystallization process [3][4][5][10][11][12] in various polymer systems. The work on the crystallizing polymers have generally focused on the time scales of the gelation process, 4,10 the rheological properties of the critical gel, 11 and the crystallinity at the gel point.…”

Section: Introductionmentioning

confidence: 99%

Liquid–solid transition in mesophase separated olefin multiblock copolymers during crystallization

Chen

et al. 2015

RSC Adv.

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The effect of block structure on the liquid-solid transition (LST) of ethylene-octene multiblock copolymers (OBCs) during isothermal crystallization has been investigated by rheology, differential scanning calorimetry (DSC), and polarized optical microscopy (POM). Due to the mesophase separation in OBC melts, the formation of a critical network at the LST in the OBCs with low crystallinity (7-14 wt%) was found to be different from that in homogeneous systems. The viscoelastic properties at the LST in the heterogeneous OBCs suggested a slower relaxation behavior of the critical network, and the liquid-solid transition in strongly segregated OBCs was observed to occur in the intermediate or even late stage of crystallization, demonstrated by the much higher crystallinity and large spherulites at the LST. The delayed liquid-solid transition has been discussed and can be attributed to the initial confinement of the hard-block domains in the nucleation and growth of the crystals.

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“…From this point of view, polyhedral oligomeric silsesquioxanes (POSSs) [17][18][19][20][21] are one of the most suitable candidates because of their precisely defined three-dimensional structure. POSSs have been widely used as fillers, [22][23][24][25][26][27] cross-linkers, 28-33 monomers [34][35][36][37] and substituents to polymer side chains, [38][39][40][41][42][43] to attain high performance. To obtain a POSS emulsifier, the basic strategy is the construction of amphiphilic POSS derivatives.…”

Section: Introductionmentioning

confidence: 99%

Tripodal polyhedral oligomeric silsesquioxanes as a novel class of three-dimensional emulsifiers

Imoto

Nakao

Nishizawa

et al. 2015

Polym J

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Tripodal amphiphilic molecules toward organic-inorganic hybrid emulsions were successfully synthesized based on incompletely condensed polyhedral oligomeric silsesquioxanes (POSSs). The three silanol groups provide an excellent scaffold for the construction of three-dimensional amphiphilic molecules, thus well-defined tripodal amphiphilic POSS derivatives were readily synthesized. Thermal analyses revealed that an incompletely condensed POSS exhibited lower crystallinity without loss of thermal stability in comparison with a completely condensed POSS, whereas readily forms aggregates because of its high crystallinity. The newly synthesized tripodal amphiphilic POSSs possessed good solubility in water and effectively stabilized oil-in-water emulsions, while a conventional mono-substituted amphiphilic POSS did not work as an emulsifier because of its lack of water solubility. The prepared organic-inorganic hybrid emulsions were stable against coalescence, and no demulsification occurred over 1 month.

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Crosslinking of low density polyethylene with octavinyl polyhedral oligomeric silsesquioxane as the crosslinker

Cited by 31 publications

References 49 publications

POSS Grafting on Polyethylene and Maleic Anhydride‐Grafted Polyethylene by One‐Step Reactive Melt Mixing

POSS Grafting on Polyethylene and Maleic Anhydride‐Grafted Polyethylene by One‐Step Reactive Melt Mixing

Liquid–solid transition in mesophase separated olefin multiblock copolymers during crystallization

Tripodal polyhedral oligomeric silsesquioxanes as a novel class of three-dimensional emulsifiers

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