The Thermal Decomposition and Glass Transition Temperature of Poly(p-tert-butyistyrene)

Malhotra, S. L.; Lessard, Paul; Blanchard, L. P.

doi:10.1080/00222338108066435

Cited by 25 publications

(21 citation statements)

References 19 publications

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“…Previous scholars have tried to gather data from the literature to find relationships between T g and M n . , To further demonstrate the applicability of the relationship in eq , we searched T g values with M n information in the database and literature. − Seventy-two polymers were found with sufficient data points, in which 32 polymers and regression results are shown in Figure (all polymers are shown in Table S1 in the Supporting Information). Although controversy has arisen over the correlation curve between T g and M n , − our results show that T g increases asymptotically toward a constant limiting value with increasing M n in the overwhelming majority of the cases with sufficient data points.…”

Section: Resultsmentioning

confidence: 99%

Modified Group Contribution Scheme to Predict the Glass-Transition Temperature of Homopolymers through a Limiting Property Dataset

Yang

Zou

et al. 2020

ACS Omega

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Previous studies on glass-transition temperature (T g ) prediction mainly focus on developing diverse methods with higher regression accuracy, but very little attention has been paid to the dataset. Generally, a large range of T g values of a specified polymer could be found in the literature but which one should be selected into a dataset merely depends on the implicit preference rather than a recognized and clear criterion. In this paper, limiting glass-transition temperature (T g (∞)), a constant value obtained at the infinite number-average molecular weight M n , was validated to be an adequate bridge index in the T g prediction models. Furthermore, a new dataset containing 198 polymers was established to predict T g (∞) using the improved group contribution method and it showed a good correlation (R 2 = 0.9925, adjusted R 2 = 0.9894). The method could also generate T g −M n curves by introducing the T g (∞) function and provide more information to polymer scientists and engineers for material selection, product design, and synthesis.

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Section: Resultsmentioning

confidence: 99%

Modified Group Contribution Scheme to Predict the Glass-Transition Temperature of Homopolymers through a Limiting Property Dataset

Yang

Zou

et al. 2020

ACS Omega

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“…It can be seen from (a) that glass transition temperature (T g ) of HBD-1 and HBD-2 is −15 °C and −44.5 °C, respectively. The T g was generally used to characterize the relative flexibility of polymer chains, the lower the glass transition temperature was, the better the flexibility of the molecular chain was [ 40 , 41 ]. High polymer chain flexibility helps to dissolve HBD in SC–CO 2 [ 35 ].…”

Section: Resultsmentioning

confidence: 99%

“…The polymer parameters were shown in Table 4. chains, the lower the glass transition temperature was, the better the flexibility of the molecular chain was [40,41]. High polymer chain flexibility helps to dissolve HBD in SC-CO2 [35].…”

Section: Glass Transition Temperature and Molecular Weight Analysismentioning

confidence: 99%

Preparation and Performance of Supercritical Carbon Dioxide Thickener

Liu¹,

Wang²,

Lei³

2020

Polymers

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The low sand-carrying problem caused by the low viscosity of supercritical carbon dioxide (SC–CO2) limits the development of supercritical CO2 fracturing technology. In this study, a molecular simulation method was used to design a fluorine-free solvent-free SC–CO2 thickener 1,3,5,7-tetramethylcyclotetrasiloxane (HBD). Simulations and experiments mutually confirm that HBD-1 and HBD-2 have excellent solubility in SC–CO2. The apparent viscosity of SC–CO2 after thickening was evaluated with a self-designed and assembled capillary viscometer. The results show that when the concentration of HBD-2 is 5 wt.% (305.15 K, 10 MPa), the viscosity of SC–CO2 increases to 4.48 mPa·s. Combined with the capillary viscometer and core displacement device, the low damage of SC–CO2 fracturing fluid to the formation was studied. This work solves the pollution problems of fluoropolymers and co-solvents to organisms and the environment and provides new ideas for the molecular design and research of SC–CO2 thickeners.

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“…There are similarly a wide variety of substituted styrenes that are inert to many chemical transformations, including 4-methylstyrene, 4- tert -butylstyrene, and 4-chlorostyrene. Most of these styrene derivatives can be used to make polymers that are glassy at room temperature, and many of them are well studied and readily available. − The ideal system will have three blocks that are processable in similar solvents and have similar surface energies to simplify thin film self-assembly into the desired perpendicularly oriented morphologies. We achieved this by using a styrene backbone through all three blocks of the ABC triblock polymer with covalently attached masked functional groups that are converted to anions and cations after polymerization.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Self-Assembly of Block Polyelectrolyte Membranes through a Mild, 2-in-1 Postpolymerization Treatment

Goldfeld

Silver

Radlauer

2020

ACS Appl. Polym. Mater.

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Block polymer systems containing spatially separated positive and negative charges are desirable for a number of applications, including biomedical devices, membrane separations, and coatings. Unfortunately, the tendency of positive and negative block polymers to charge cancel and form an insoluble coacervate precipitate leads to processing difficulties in the fabrication of charged thin films. We use postpolymerization modifications to simultaneously add both negative and positive charges to self-assembled neutral ABC triblock polymer thin films. Using reversible addition–fragmentation chain transfer polymerization, we synthesized triblock terpolymers consisting of poly(n-propyl styrene sulfonic ester), poly(4-chlorostyrene), and poly(vinylbenzyl chloride). The chemical functionalization of both charged blocks was accomplished simultaneously through exposure to gaseous trimethylamine in a single step at room temperature, simplifying the synthetic procedure and preserving the microstructure of the thin film. The quantitative functionalization was tracked through attenuated total reflectance infrared spectroscopy, and the thin film morphology was evaluated using intermodulation atomic force microscopy, transmission electron microscopy, and grazing-incidence small-angle X-ray scattering.

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The Thermal Decomposition and Glass Transition Temperature of Poly(p-tert-butyistyrene)

Cited by 25 publications

References 19 publications

Modified Group Contribution Scheme to Predict the Glass-Transition Temperature of Homopolymers through a Limiting Property Dataset

Modified Group Contribution Scheme to Predict the Glass-Transition Temperature of Homopolymers through a Limiting Property Dataset

Preparation and Performance of Supercritical Carbon Dioxide Thickener

Synthesis and Self-Assembly of Block Polyelectrolyte Membranes through a Mild, 2-in-1 Postpolymerization Treatment

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