Differential scanning calorimetry poly acid

Figure 10.7 The phase diagram (a) and the glass transition temperatures (b) of a PSC/PVME mixture obtained, respectively, by light scattering and differential scanning calorimetry (DSC). Irradiation experiments were performed in the miscible region at 127 C indicated by (X) in the figure of trans-cinnamic acid-labeled polystyrene/poly(vinyl methyl ether) blends.

Abbreviations y x AFM AIBN BuMA Ca DCP DMA DMS DSC EGDMA EMA EPDM FT-IR HDPE HTV IPN LDPE LLDPE MA MAA MDI MMA PA PAC PB PBT PBuMA PDMS PDMS-NH2 interfacial tension viscosity ratio atomic force microscopy 2,2 -azobis(isobutyronitrile) butyl methacrylate capillary number dicumyl peroxide dynamic mechanical analysis dynamic mechanical spectroscopy differential scanning calorimetry ethylene glycol dimethacrylate ethyl methacrylate ethylene-propylene-diene rubber Fourier transform-infra-red high density polyethylene high temperature vulcanization interpenetrating polymer network low density polyethylene linear low density polyethylene maleic anhydride methacrylic acid 4,4 -diphenylmethanediisocyanate methyl methacrylate poly( amide) poly( acrylate) poly(butadiene) poly(butylene terephtalate) poly(butyl methacrylate) poly(dimethylsiloxane) amino-terminated poly(dimethylsiloxane)... 

Finally, libraries aimed to chiral resolution of racemates will be covered here in particular, the use of chiral stationary phases (CSPs) has recently been reported for the identification of materials to be used for chiral separation of racemates by HPLC. The group of Frechet reported the selection of two macroporous poly methacrylate-supported 4-aryl-1,4-dihydropyrimidines (DHPs) as CSPs for the separation of amino acid, anti-inflammatory drugs, and DHP racemates from an 140-member discrete DHP library (214,215) as well as a deconvolutive approach for the identification of the best selector phase from a 36-member pool library of macroporous polymethacrylate-grafted amino acid anilides (216,217). Welch and co-workers (218,219) reported the selection of the best CSP for the separation of a racemic amino acid amide from a 50-member discrete dipeptide iV-3,5-dinitrobenzoyl amide hbrary and the follow-up, focused 71-member library (220). Wang and Li (221) reported the synthesis and the Circular Dichroism- (CD) based screening of a 16-member library of CSPs for the HPLC resolution of a leucine ester. Welch et al. recentiy reviewed the field of combinatorial libraries for the discovery of novel CSPs (222). Dyer et al. (223) reported an automated synthetic and screening procedure based on Differential Scanning Calorimetry (DSC) for the selection of chiral diastereomeric salts to resolve racemic mixtures by crystallization. Clark Still rejxrrted another example which is discussed in detail in Section 9.5.4. 

Although water is known as a natural plasticizer for many polar polymers such as nylon, polyester resins, and cellulosic polymers, similar behavior for polyacrylamide and poly(acrylamide-co-acrylic acid) has not been investigated. In this study, the effect of water content (and/or thermal history) on the Tg s of acrylamide-based pol3 TOers was studied by Differential Scanning Calorimetry (DSC), Thermogravimetry (TG), Thermomechanical Analysis (TMA), and Simultaneous Thermogravimetry - Mass Spectrometry (TG/MS). 

AFM, atomic force microscopy DMA, dynamic mechanical analysis DSC, differential scanning calorimetry flVR, oxidized natural rubber FTIR, Fourier transform infrared spectroscopy NR, natural rubber PLA, poly(lactic acid) QP, quaternary phosphonium salt TGA, thermogravimetric anal is TPU, thermoplastic polyurethane XPCL, end-carboxylated teledielic... 

Figure 2.13 DSC thermograms of PLA50 after 0,98, and 126 days in vitro degradation, (a) First heating, and (b) second heating. PIA, poly(lactic acid) DSC, differential scanning calorimetry. Li S., McCarthy S., 1999a. Further investigations on the hydrolytic degradation of poly (DL-lactide). Biomaterials, 20 (1) 35—44. Reprinted with permission.

Poly (Vinyl Acetate-co-Methacrylic acid) copolymeric microspheres crosslinked with N, N -methylene bisacrylamide have been prepared by free radical emulsion polymerization. The microspheres have been characterized by differential scanning calorimetry (DSC) and x-ray diffractometry (X-RD) to understand about the drag dispersion in microspheres. Scanning electron microscopy (SEM) was used to assess the surface morphology of particles prepared, and observe the spherical nature... 

A new type of amphiphihc polymer blend comprising polystyrene (PS), poly(ethylene oxide) (PEO), and microspheres of cross-hnked polystyrene sulfonic acid (PSSA) was prepared by solution blending and followed by casting. The ir and the differential scanning calorimetry (dsc) studies showed that besides providing protons, PSSA plays a role in enhancing the miscibility of PS and PEO. The influence of the mixing extent between PS and PEO on the proton conductivity has also been studied (162). 

Vasanthan, N., Ly, O., 2009. Effect of microstructure on hydrolytic degradation studies of poly(L-lactic acid) by FTIR spectroscopy and differential scanning calorimetry. Polym. Degrad. Stabil. 94, 1364-1372. 

Shieh, Y.-T.and Liu, G.-L. (2007) Temperature-modulated differential scanning calorimetry studies on the origin of double melting peaks in isothermally melt-crystallized poly(L-lactic acid), Journal of Polymer Science Part B Polymer Physics, 45,466-474. 

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