Stereocomplexation of sPMMA-PBD-sPMMA triblock copolymers with isotactic PMMA: 1. Thermal and mechanical properties of stereocomplexes

Yu, Jie; Yu, Yingning; Dubois, Philippe; Jérôme, Robert

doi:10.1016/s0032-3861(96)00756-2

Cited by 15 publications

(12 citation statements)

References 25 publications

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“…The first T g value corresponds to the PS block (101 ºC), and the second to the PMMA block (122 ºC). The T g (122 ºC) was similar to the value determined by Yu et al 23 for syndiotactic PMMA (125 ºC), suggesting that the PMMA tacticity (in the copolymer) was not the same as that observed for PMMA when pure or as a component in the blend. The side chain of isotactic PMMA is characterized by high frequency in the rotation (high mobility) which is associated with a T g lower than the syndiotactic value.…”

Section: Characterization Of the Filmssupporting

confidence: 77%

Adhesion of L929 mouse ribroblast cells on poly(styrene)/poly(methyl methacrylate) films

Melo¹,

Bet²,

Assreuy³

et al. 2009

J. Braz. Chem. Soc.

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Filmes de poli(estireno) (PS), poli(metacrilato de metila) (PMMA), blenda de PS/PMMA (1:1) e copolímero PS-b-PMMA foram preparados e avaliados quanto à adesão celular usando fibroblastos de camundongos L929. Embora todos os filmes poliméricos tenham se mostrado bons substratos para o crescimento e proliferação celular, estes processos foram levemente favorecidos na blenda PS:PMMA. O número e a morfologia foram idênticos para cultura de células nos filmes e na lamínula de vidro ou na placa de plástico. A característica química dos filmes poliméricos é adequada para suportar o ataque e proliferação das células, sugerindo que esses filmes são bons candidatos para usos biomédicos.Films of pure poly(styrene) (PS), pure poly(methyl methacrylate) (PMMA), a 1:1 PS/PMMA blend and a PS-b-PMMA copolymer, were prepared and tested for cell adhesion using L929 mouse fibroblasts. All polymer films were found to be good substrates for cell adhesion and proliferation, and both processes were slightly favored on films of the 1:1 PS/PMMA blend. The same results were obtained in terms of cell number and morphology for cells cultured on films, glass coverslips or plastic plates. The chemical characteristics of polymer films make them suitable supports for cell attachment and proliferation, indicating that these films are good candidates for biomedical uses.

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Section: Characterization Of the Filmssupporting

confidence: 77%

Adhesion of L929 mouse ribroblast cells on poly(styrene)/poly(methyl methacrylate) films

Melo¹,

Bet²,

Assreuy³

et al. 2009

J. Braz. Chem. Soc.

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“…PMMA stereocomplexes were formed within multi-block TPEs leading to a significant improvement of thermal properties relative to noncomplexed analogues (Figure 2). [330][331][332][333][334][335][336] In such systems the stereocomplexed PMMA segments were implicated as physical cross-links. The in situ stereocomplexing polymerization of methyl methacrylate furnished sc-PMMA that was highly crystalline, but surprisingly optically transparent as well.…”

Section: Pmmamentioning

confidence: 99%

Stereochemical enhancement of polymer properties

et al. 2019

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The importance of stereochemistry to the function of molecules is generally well understood. However, to date, control over stereochemistry and its potential to influence properties of the resulting polymers are, as yet, not fully realised. This review focuses on the state-of-the-art with respect to how stereochemistry in polymers has been used to influence and control their physical and mechanical properties as well as begin to control their function. A brief overview of the synthetic methodology by which to access these materials is included, with the main focus directed towards stereochemical control over properties such as mechanical, biodegradation and conductivity. Additionally, the advances being made towards enantioseparation, enantioselective catalyst supports and stereo-directed transitions are discussed. Finally, we also consider the opportunities that the rich stereochemistry of sustainably-sourced monomers could offer in this field. Where possible, parallels and general design principles are drawn together to identify opportunities and limitations that these approaches may present in their effects on materials properties, performance and function.

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“…Stereocomplexes of i-PMMA or s-PMMA with diblock-or triblockcopolymer have been reported, such as polyisobutylene block copolymers (67,68), poly(dimethylsi1oxane) block copolymers (69), and polybutadiene (PB) block copolymers (70,71). Yu and Jerome have reported that stereocomplexation of tactic polymers increases the tensile strength of PMMA-PB-PMMA copolymers, containing small s-PMMA blocks at constant molecular weight of PB and i-PMMA, whereas an opposite effect is observed for longer s-PMMA blocks (71).…”

Section: Complex Formation In Mixtures Of Pmma Of Opposite Tacticitiesmentioning

confidence: 99%

Tacticity in Vinyl Polymers

Woo

Chang

2011

Encyclopedia of Polymer Science and Technology

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Various issues of tacticity in vinyl polymers are discussed. First, tacticity is defined and the concepts of tactic forms in polymers as a stereoregular configuration order are introduced, and illustration schemes for common polymer tacticity are shown. Effects of tacticity in polymer structures on crystalline morphology and property are briefly discussed. Several commercially useful tactic polymers are examined, by using examples of vinyl‐type polymers such as tactic polypropylene (PP), polystyrene (PS), and poly(methyl methacrylate) (PMMA). Catalysts and synthesis routes for producing stereoregular tactic polymers are discussed mainly using PMMA as an example. Tacticity in polymers is related to differences in microstructures, morphology, crystalline polymorphism, and physical/mechanical properties. Tactic polymers possess structural order and are to crystallize. Tacticity and crystalline properties of polymers are discussed. Crystal polymorphism in some tactic polymers, such as syndiotactic polystyrene (s‐PS), is discussed in greater detail. Complex formation in mixtures of polymers of opposite tacticities, just like mixtures of polymers of opposite chiral forms, has been reported. Complex formation in mixtures of polymers of opposite (s‐ and i‐tacticity) is discussed using examples of isotactic PMMA (i‐PMMA) and syndiotactic PMMA (s‐PMMA); on the other hand, complex formation of mixtures of other tactic polymers, such as i‐PS/s‐PS or i‐PP/s‐PP, is not known. Effects of tacticity on the miscibility and phase behavior in blends of tactic polymers with other polymers are surveyed and expounded. Blends of polymers of same chemical structure but opposite tacticities are not always miscible, as exemplified in a blend of nonpolar and highly crystalline s‐PP with i‐PP, showing immiscibility with upper critical solution temperature behavior but a‐PP being miscible with s‐PP or i‐PP. In addition, phase behaviors of binary blends of two isomeric polymers are addressed. In blends with weak interactions and borderline phase homogeneity, the tacticity effect on miscibility is usually more pronounced; in contrast, the effect on the phase behavior may be minimal in systems with strong intermolecular interactions.

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Stereocomplexation of sPMMA-PBD-sPMMA triblock copolymers with isotactic PMMA: 1. Thermal and mechanical properties of stereocomplexes

Cited by 15 publications

References 25 publications

Adhesion of L929 mouse ribroblast cells on poly(styrene)/poly(methyl methacrylate) films

Adhesion of L929 mouse ribroblast cells on poly(styrene)/poly(methyl methacrylate) films

Stereochemical enhancement of polymer properties

Tacticity in Vinyl Polymers

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