Tensile flow and stress–strain behavior over a wide temperature range for poly(butyl methacrylate) with a broad molecular weight distribution

Vinogradov, G. V.; Dreval, V. E.; Borisenkova, E. K.; Kurbanaliev, M. K.; Zabugina, M.P.

doi:10.1002/polb.1986.090240906

Cited by 6 publications

(3 citation statements)

References 14 publications

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“…A series of modified CNCs was successfully prepared; two different molecular weights of the grafted and adsorbed polymers (micelles and latex particles) were targeted. On the basis of the PBMA critical molecular weight for chain entanglement, M c,n of about 56 000 g mol −1 corresponding to a DP of 400, 34 targeted molecular weights of the PBMA-based polymers were selected to be above and below the M c,n , and the synthesized polymers were denoted long (L) and short (S), respectively. Surface Modification of CNCs.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…In the block copolymers, i.e., micelles and latex particles, the PDMAEMA block length was kept constant while the molecular weight ( M n ) of the hydrophobic PBMA block was varied. Two different PBMA lengths were studied, aiming for M n above and below the critical molecular weight for chain entanglement of PBMA, ∼56 000 g mol –1 . To render it possible to perform reliable comparisons, it is crucial that samples prepared with different methods contain the same fraction of CNCs.…”

Section: Introductionmentioning

confidence: 99%

“…Two different PBMA lengths were studied, aiming for M n above and below the critical molecular weight for chain entanglement of PBMA, ∼56 000 g mol −1 . 34 To render it possible to perform reliable comparisons, it is crucial that samples prepared with different methods contain the same fraction of CNCs. Nanocomposites were prepared by melt extrusion of modified CNCs and poly(ε-caprolactone) (PCL), and the properties (transparency, thermal stability, mechanical performance) of the of the resulting nanocomposites were investigated.…”

Section: ■ Introductionmentioning

confidence: 99%

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Polycaprolactone Nanocomposites Reinforced with Cellulose Nanocrystals Surface-Modified via Covalent Grafting or Physisorption: A Comparative Study

Boujemaoui

Sánchez

Engström

et al. 2017

ACS Appl. Mater. Interfaces

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In the present work, cellulose nanocrystals (CNCs) have been surface-modified either via covalent grafting or through physisorption of poly(n-butyl methacrylate) (PBMA) and employed as reinforcement in PCL. Covalent grafting was achieved by surface-initiated atom transfer radical polymerization (SI-ATRP). Two approaches were utilized for the physisorption: using either micelles of poly(dimethyl aminoethyl methacrylate)-block-poly(n-butyl methacrylate) (PDMAEMA-b-PBMA) or latex nanoparticles of poly(dimethyl aminoethyl methacrylate-co-methacrylic acid)-block-poly(n-butyl methacrylate) (P(DMAEMA-co-MAA)-b-PBMA). Block copolymers (PDMAEMA-b-PBMA)s were obtained by ATRP and subsequently micellized. Latex nanoparticles were produced via reversible addition-fragmentation chain-transfer (RAFT) mediated surfactant-free emulsion polymerization, employing polymer-induced self-assembly (PISA) for the particle formation. For a reliable comparison, the amounts of micelles/latex particles adsorbed and the amount of polymer grafted onto the CNCs were kept similar. Two different chain lengths of PBMA were targeted, below and above the critical molecular weight for chain entanglement of PBMA (M ∼ 56 000 g mol). Poly(ε-caprolactone) (PCL) nanocomposites reinforced with unmodified and modified CNCs in different weight percentages (0.5, 1, and 3 wt %) were prepared via melt extrusion. The resulting composites were evaluated by UV-vis, scanning electron microscopy (SEM), thermal gravimetric analysis (TGA), and tensile testing. All materials resulted in higher transparency, greater thermal stability, and stronger mechanical properties than unfilled PCL and nanocomposites containing unmodified CNCs. The degradation temperature of PCL reinforced with grafted CNCs was higher than that of micelle-modified CNCs, and the latter was higher than that of latex-adsorbed CNCs with a long PBMA chain length. The results clearly indicate that covalent grafting is superior to physisorption with regard to thermal and mechanical properties of the final nanocomposite. This unique study is of great value for the future design of CNC-based nanocomposites with tailored properties.

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Section: ■ Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: ■ Introductionmentioning

confidence: 99%

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Polycaprolactone Nanocomposites Reinforced with Cellulose Nanocrystals Surface-Modified via Covalent Grafting or Physisorption: A Comparative Study

Boujemaoui

Sánchez

Engström

et al. 2017

ACS Appl. Mater. Interfaces

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Extension rheology of liquid-crystalline solution/layered silicate hybrids

et al. 2009

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The extension rheology of polymer/layered silicate composites based on liquid-crystalline (LC) solution of hydroxypropylcellulose (HPC) in oligomeric polyethyleneglycole (PEG) was studied. The HPC concentration was 60 wt%. Extension experiments have been carried out for materials in the different phase states. Compositions containing Na-montmorillonite (MMT) were prepared by a two-stage method. Final systems may be attributed to solutions of HPC in PEG, which intercalates into MMT galleries. The ordered domain structure of the LC matrix as well as hydrogen-bonded network between HPC and PEG molecules significantly reduce deformation at break and provide a strong nonlinear viscoelastic behavior at extension. Appearance of isotropic phase in solutions leads to a sharp drop of the elongation viscosity. The introduction of clay into LC solution only slightly affects the viscosity value but significantly suppresses the strain-hardening scale. In contrast, loading in biphasic state of HPC-PEG solution with even small amount (1 wt%) of MMT leads to the drastic viscosity increase that does not change in further growth of the filler concentration. Elastic properties of the systems under study demonstrate the similar behavior. This effect likely is caused by the interrelationship between deformability of the LC domain structure and the network strength formed by the clay particles. POLYM. ENG. SCI., 50:789-799, 2010.

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Stress-Strain Properties of Poly(Butyl Methacrylate) at Uniaxial Extension in Liquid Media at Temperatures Above and Below Glass Transition Temperature

Kurbanaliev

Kadirov

Dreval

et al. 1990

Third European Rheology Conference and Golden Jubilee Meeting of the British Society of Rheology

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Tensile flow and stress–strain behavior over a wide temperature range for poly(butyl methacrylate) with a broad molecular weight distribution

Cited by 6 publications

References 14 publications

Polycaprolactone Nanocomposites Reinforced with Cellulose Nanocrystals Surface-Modified via Covalent Grafting or Physisorption: A Comparative Study

Polycaprolactone Nanocomposites Reinforced with Cellulose Nanocrystals Surface-Modified via Covalent Grafting or Physisorption: A Comparative Study

Extension rheology of liquid-crystalline solution/layered silicate hybrids

Stress-Strain Properties of Poly(Butyl Methacrylate) at Uniaxial Extension in Liquid Media at Temperatures Above and Below Glass Transition Temperature

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