Block Copolymers in Homopolymer Blends:  Interface vs Micelles

Adedeji, Adeyinka; Lyu, SuPing; Macosko, Christopher W.

doi:10.1021/ma001944b

Cited by 100 publications

(110 citation statements)

References 12 publications

Supporting

Mentioning

105

Contrasting

Order By: Relevance

“…[43][44][45][46][47][48] As shown in Figure S8, the higher magnification TEM micrographs showed that many white particles (30~40 nm in diameter) existed in the PVDF phase when the blends were compatibilized by RL and these particles might be correlated with the PLLA grafted RL polymers, which were drawn from the interface under shear condition. [49][50][51][52] It was noteworthy that such tiny particles were scarcely found in the PVDF phase of the blends compatibilized by RC. The PLLA phase was occasionally also occluded in the PVDF phase to form white domains with a diameter ranged from 200 to 500 nm, as shown in Figure 11 and Figure S7.…”

Section: Discussionmentioning

confidence: 99%

Synthesis of Reactive Comb Polymers and Their Applications as a Highly Efficient Compatibilizer in Immiscible Polymer Blends

Dong

Wang

et al. 2015

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

Reactive comb (RC) polymers were synthesized by copolymerizing methyl methacrylate (MMA) with glycidyl methacrylate (GMA) and a kind of MMA macromer. The obtained molecules had both epoxide groups and long PMMA side chains distributed randomly along the PMMA backbone. The synthesized RC polymers were applied as compatibilizers in an immiscible poly(L-lactic acid)/poly(vinylidene fluoride) (PLLA/PVDF) system. Compared to their linear counterparts, only 1 wt% of RC polymers with appropriate length of side chains significantly reduced the size and enhanced the uniformity of the PVDF dispersed phase in PLLA matrix and the RC-compatibilized blends exhibited a significant improvement in fracture strain. The higher compatibilization efficiency of RC polymers was ascribed to the existence of PMMA side chains, which improved the stability of RC polymers at the interface of immiscible blend and this was demonstrated by TEM.

show abstract

Section: Discussionmentioning

confidence: 99%

Synthesis of Reactive Comb Polymers and Their Applications as a Highly Efficient Compatibilizer in Immiscible Polymer Blends

Dong

Wang

et al. 2015

Ind. Eng. Chem. Res.

View full text Add to dashboard Cite

show abstract

“…Its main advantage is that copolymers appear at the interface just where they are needed to improve thermodynamic and mechanical properties of a composite. 6 Understanding the fundamentals of reactive polymer blending requires various contributions to be separated, which is possible only for relatively simple systems. One of the most popular models is a flat interface between melts of incompatible homopolymers A and B, end units of which are functionalized with complementary reactive groups.…”

Section: Introductionmentioning

confidence: 99%

Simulation of End-Coupling Reactions at a Polymer−Polymer Interface: The Mechanism of Interfacial Roughness Development

Berezkin

Kudryavtsev

2010

Macromolecules

View full text Add to dashboard Cite

End-coupling between immiscible melts of two monofunctionalized polymers of a same length was modeled by dissipative particle dynamics starting from a flat interface and up to the formation of a mature lamellar microstructure. Influence of the reaction rate, chain length, and incompatibility of components on the kinetics of copolymer formation and morphology development was investigated. Regimes of linear and logarithmic growth of the conversion with time were observed before the flat interface became unstable. The conditions and mechanism of interfacial roughness development were studied in detail. It was demonstrated that overcrowding the interface with the copolymer product causing its phase separation plays the main role in spontaneous interface distortion. The instability leads to autocatalytic interface growth with exponential kinetics, when each new portion of the product creates more area for further reactions. It was followed by a slower terminal regime including formation and ripening of the lamellar microstructure. The late stage kinetics of end-coupling was strongly influenced by depletion of reactants and formation of ordered product layers. At certain conditions, it became asymptotically diffusion controlled in agreement with published experimental data.

show abstract

“…[32][33][34][35][36][37][38][39][40][41] In this article, we use an A-C diblock copolymer to organize A and B homopolymers. The C block is designed to have attractive interactions with the B homopolymer and repulsive interactions with the A homopolymer.…”

Section: Introductionmentioning

confidence: 99%

Microphase and Macrophase Separation in Multicomponent A/B/A−C Polymer Blends with Attractive and Repulsive Interactions

et al. 2006

View full text Add to dashboard Cite

A balanced A-C diblock copolymer surfactant was used to organize mixtures of immiscible A and B homopolymers. The C block of the copolymer exhibits repulsive and attractive interactions with the A and B homopolymers, respectively, leading to rich phase behavior. Experimental results indicate the existence of a microphase-separated state at low temperatures, a homogeneous phase at intermediate temperatures, and macrophase separation at high temperatures. It is unusual for a microphase-separated blend to exhibit a homogeneous phase prior to macrophase separation. In this study, component A was saturated polybutadiene with 89% 1,2-addition, component B was polyisobutylene, block A of the diblock copolymer was chemically equivalent to component A, and block C of the diblock copolymer was saturated polybutadiene with 63% 1,2-addition. We use a combination of Flory-Huggins theory (FHT), self-consistent field theory (SCFT) and the random-phase approximation (RPA) to understand the origin of our observations. All of the parameters needed for the SCFT, FHT, and RPA calculations were obtained from independent measurements. The measured length scale of the periodic concentration fluctuations in the homogeneous state and the domain spacing of the microphase-separated blends were in close agreement with RPA and SCFT, respectively. The transition temperatures between phases predicted with theory were in reasonable agreement with the experimental measurements.

show abstract

Block Copolymers in Homopolymer Blends: Interface vs Micelles

Cited by 100 publications

References 12 publications

Synthesis of Reactive Comb Polymers and Their Applications as a Highly Efficient Compatibilizer in Immiscible Polymer Blends

Synthesis of Reactive Comb Polymers and Their Applications as a Highly Efficient Compatibilizer in Immiscible Polymer Blends

Simulation of End-Coupling Reactions at a Polymer−Polymer Interface: The Mechanism of Interfacial Roughness Development

Microphase and Macrophase Separation in Multicomponent A/B/A−C Polymer Blends with Attractive and Repulsive Interactions

Contact Info

Product

Resources

About