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Journal articles on the topic 'Molecular weight distribution'

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Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Tobita, Hidetaka, Yoshiyasu Yamamoto, and Kenji Ito. "Molecular weight distribution in random crosslinking of polymers: Modality of the molecular weight distribution." Macromolecular Theory and Simulations 3, no. 6 (November 1994): 1033–49. http://dx.doi.org/10.1002/mats.1994.040030607.

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2

Mahabadi, H. Kh, and L. Alexandru. "Molecular weight – viscosity relationships for a broad molecular weight distribution polymer." Canadian Journal of Chemistry 63, no. 1 (January 1, 1985): 221–22. http://dx.doi.org/10.1139/v85-035.

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A novel and simple method is described for evaluation of molecular weight – viscosity relationships for a polymer where only broad molecular weight distribution samples are available. The method demands measurement of the intrinsic viscosity and GPC chromatograms of several samples. Results of applying the procedure to bisphenol A – Diethyleneglycol (50:50) copolycarbonate are presented.

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3

Ansari, Mahmoud, Yong W. Inn, Ashish M. Sukhadia, Paul J. DesLauriers, and Savvas G. Hatzikiriakos. "Wall slip of HDPEs: Molecular weight and molecular weight distribution effects." Journal of Rheology 57, no. 3 (May 2013): 927–48. http://dx.doi.org/10.1122/1.4801758.

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4

Göbelt, Bernd. "Molecular weight distribution in living polymerization." Progress in Organic Coatings 55, no. 2 (February 2006): 189–93. http://dx.doi.org/10.1016/j.porgcoat.2005.07.012.

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5

Siochi, E. J., and T. C. Ward. "ABSOLUTE MOLECULAR WEIGHT DISTRIBUTION OF NITROCELLULOSE." Journal of Macromolecular Science, Part C: Polymer Reviews 29, no. 4 (November 1989): 561–657. http://dx.doi.org/10.1080/07366578908050890.

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6

Ewart, John A. D. "Calculated molecular weight distribution for glutenin." Journal of the Science of Food and Agriculture 38, no. 3 (1987): 277–89. http://dx.doi.org/10.1002/jsfa.2740380312.

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7

Ouano, Augustus C., and Philip L. Mercier. "The molecular weight distribution of polypropylene." Journal of Polymer Science Part C: Polymer Symposia 21, no. 1 (March 8, 2007): 309–15. http://dx.doi.org/10.1002/polc.5070210127.

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8

Pepperl, G. "Molecular weight distribution of commercial PVC." Journal of Vinyl and Additive Technology 6, no. 2 (June 2000): 88–92. http://dx.doi.org/10.1002/vnl.10229.

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9

Tobita, Hidetaka, Yuko Takada, and Mamoru Nomura. "Molecular Weight Distribution in Emulsion Polymerization." Macromolecules 27, no. 14 (July 1994): 3804–11. http://dx.doi.org/10.1021/ma00092a020.

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10

Southan, M., and F. MacRitchie. "Molecular Weight Distribution of Wheat Proteins." Cereal Chemistry Journal 76, no. 6 (November 1999): 827–36. http://dx.doi.org/10.1094/cchem.1999.76.6.827.

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11

Champagne, Philippe J., Emmanuel Manolakis, and Marten Ternan. "Molecular weight distribution of Athabasca bitumen." Fuel 64, no. 3 (March 1985): 423–25. http://dx.doi.org/10.1016/0016-2361(85)90438-7.

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12

TAKANO, Atsushi. "Which is the Highest Molecular-Weight Polymer Having Narrow Molecular Weight Distribution." Kobunshi 47, no. 12 (1998): 904–5. http://dx.doi.org/10.1295/kobunshi.47.904.

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13

Tuminello, W. H. "Molecular weight and molecular weight distribution from dynamic measurements of polymer melts." Polymer Engineering and Science 26, no. 19 (October 1986): 1339–47. http://dx.doi.org/10.1002/pen.760261909.

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14

Todd, William G., Victor L. Olenius, and Jean A. Merrick-Mack. "Prediction of Polyethylene Molecular Weight and Molecular Weight Distribution Using Capillary Rheometer." Journal of Plastic Film & Sheeting 24, no. 3-4 (July 2008): 181–92. http://dx.doi.org/10.1177/8756087908096625.

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15

Kong, H. J., X. M. Ding, M. M. Qiao, Y. Wu, and M. H. Yu. "Molecular weight and distribution of ultra-high molecular weight poly (p-phenyleneterephalamide)." IOP Conference Series: Materials Science and Engineering 213 (June 2017): 012044. http://dx.doi.org/10.1088/1757-899x/213/1/012044.

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16

Monteiro, Michael J. "Fitting molecular weight distributions using a log-normal distribution model." European Polymer Journal 65 (April 2015): 197–201. http://dx.doi.org/10.1016/j.eurpolymj.2015.01.009.

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17

Shiga, S., and Y. Sato. "Characterization of Polymers by GPC-LALLS. III. Branching Structure of EPDM." Rubber Chemistry and Technology 60, no. 1 (March 1, 1987): 1–13. http://dx.doi.org/10.5254/1.3536118.

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Abstract Gamma ray-irradiated EPM's, as the model polymers of branched EPDM, are investigated using the relationship g′=gb, where g′ is the ratio of intrinsic viscosities of the branched and the linear molecules of equal molecular weight, [η]br/[η]l, and g, the ratio of the mean square radii of gyration of the two, 〈s2〉br/〈s2〉l. The molecular weight distributions measured by GPC-LALLS coincide well with theoretical curves of tetrafunctionally and statistically branched polymers obtained by the ideal degradation and crosslinking of the raw EPM, which was assumed to have the most probable molecular weight distribution, and the b-value is then determined to be 1.1. EPDM samples, polymerized with a soluble vanadium compound—alkyl aluminum halide type catalyst in a continuous well-stirred pilot-reactor, are characterizedas to the number of branching points per molecule for various molecular weights by using the b-value. The higher the molecular weight, the smaller the distance between neighboring crosslinking points. The reason is discussed. The unsaturated bond of dicyclopentadiene crosslinks more readily in the manufacturing process than 5-ethylidene-2-norbornene. The largest high molecular weight portion and the broadest molecular weight distribution are observed in the EPDM with the maximum dicyclopentadiene content.

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18

Lee, Young Sil, and Kwan Han Yoon. "Determination of Molecular Weight and Molecular Weight Distribution of Polypropylene Using Rheological Properties." Polymer Korea 38, no. 6 (November 25, 2014): 735–43. http://dx.doi.org/10.7317/pk.2014.38.6.735.

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19

Crowley, Timothy J., and Kyu Yong Choi. "Calculation of Molecular Weight Distribution from Molecular Weight Moments in Free Radical Polymerization." Industrial & Engineering Chemistry Research 36, no. 5 (May 1997): 1419–23. http://dx.doi.org/10.1021/ie960623e.

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20

Rochas, Cyrille, and Marc Lahaye. "Average molecular weight and molecular weight distribution of agarose and agarose-type polysaccharides." Carbohydrate Polymers 10, no. 4 (January 1989): 289–98. http://dx.doi.org/10.1016/0144-8617(89)90068-4.

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21

Horta, Arturo, and M. Alejandra Pastoriza. "The Molecular Weight Distribution of Polymer Samples." Journal of Chemical Education 84, no. 7 (July 2007): 1217. http://dx.doi.org/10.1021/ed084p1217.

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22

Nakahama, Seiichi. "Functional polymers with narrow molecular weight distribution." Kobunshi 35, no. 3 (1986): 256–59. http://dx.doi.org/10.1295/kobunshi.35.256.

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23

Starkweather, Howard W., and Mark C. Han. "Molecular weight distribution of emulsion-polymerized polyethylene." Journal of Polymer Science Part A: Polymer Chemistry 30, no. 13 (December 1992): 2709–13. http://dx.doi.org/10.1002/pola.1992.080301306.

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24

Tobita, Hidetaka. "Fundamental Molecular Weight Distribution of RAFT Polymers." Macromolecular Reaction Engineering 2, no. 5 (July 21, 2008): 371–81. http://dx.doi.org/10.1002/mren.200800020.

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25

Krishnaswamy, Rajendra K., David C. Rohlfing, Ashish M. Sukhadia, and Kevin R. Slusarz. "Extrusion of broad-molecular-weight-distribution polyethylenes." Polymer Engineering and Science 44, no. 12 (2004): 2266–73. http://dx.doi.org/10.1002/pen.20254.

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26

Echevarría, Antonio, José R. Leiza, José C. De La Cal, and José M. Asua. "Molecular-weight distribution control in emulsion polymerization." AIChE Journal 44, no. 7 (July 1998): 1667–79. http://dx.doi.org/10.1002/aic.690440718.

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27

Lyngaae-Jørgensen, J. "Molecular weight distribution of poly(vinyl chloride)." Journal of Polymer Science Part C: Polymer Symposia 33, no. 1 (March 8, 2007): 39–54. http://dx.doi.org/10.1002/polc.5070330105.

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28

Tobita, Hidetaka. "Molecular weight distribution in nonlinear emulsion polymerization." Journal of Polymer Science Part B: Polymer Physics 35, no. 10 (July 30, 1997): 1515–32. http://dx.doi.org/10.1002/(sici)1099-0488(19970730)35:10<1515::aid-polb5>3.0.co;2-q.

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29

Starkweather, Howard W., and Souheng Wu. "Molecular weight distribution in polymers of tetrafluoroethylene." Polymer 30, no. 9 (September 1989): 1669–74. http://dx.doi.org/10.1016/0032-3861(89)90328-5.

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30

Friedrich, Christian, Richard J. Loy, and Robert S. Anderssen. "Relaxation time spectrum molecular weight distribution relationships." Rheologica Acta 48, no. 2 (October 30, 2008): 151–62. http://dx.doi.org/10.1007/s00397-008-0314-z.

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31

Romankevich, O. V., V. M. Irklei, and I. A. Lyashok. "Molecular-weight distribution of cellulose after ripening." Fibre Chemistry 32, no. 2 (March 2000): 100–104. http://dx.doi.org/10.1007/bf02361086.

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32

Tobita, Hidetaka. "Molecular Weight Distribution of Living Radical Polymers." Macromolecular Theory and Simulations 15, no. 1 (January 16, 2006): 12–22. http://dx.doi.org/10.1002/mats.200500066.

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33

Tobita, Hidetaka. "Molecular Weight Distribution of Living Radical Polymers." Macromolecular Theory and Simulations 15, no. 1 (January 16, 2006): 23–31. http://dx.doi.org/10.1002/mats.200500067.

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34

Ryu, Jinsook, Kyuhyun Im, Wonjae Yu, Jaiwook Park, Taihyun Chang, Kwanyoung Lee, and Namsun Choi. "Molecular Weight Distribution of Branched Polystyrene: Propagation of Poisson Distribution." Macromolecules 37, no. 23 (November 2004): 8805–7. http://dx.doi.org/10.1021/ma049064a.

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35

Lobos, Z. J., and H. Tang. "Rheological Determination of Molecular Weight and Molecular-Weight Distribution for Commercial-Type Butyl Elastomers." Rubber Chemistry and Technology 62, no. 4 (September 1, 1989): 623–34. http://dx.doi.org/10.5254/1.3536264.

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Abstract 1. There exists a linear correlation between rheological parameters (crossover frequency and crossover modulus) and structural parameters (Mw, and MWD) for commercial-type butyl elastomers. 2. There appears to be potential value in utilizing rheological testing for quality control for commercial-type butyl elastomers. 3. Further work is required to resolve testing problems (air entrapment and sample trimming) which affect the precision of the rheological measurements.

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36

Naga, Naofumi, and Kooji Mizunuma. "Molecular weight and molecular weight distribution of polyethene obtained withrac-Me2Si(Ind)2ZrCl2/methylaluminoxane." Macromolecular Chemistry and Physics 199, no. 1 (January 1, 1998): 113–18. http://dx.doi.org/10.1002/(sici)1521-3935(19980101)199:1<113::aid-macp113>3.0.co;2-6.

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37

Abedi, S., M. Hosseinzadeh, M. A. Kazemzadeh, and M. Daftari-Besheli. "Effect of polymerization time on the molecular weight and molecular weight distribution of polypropylene." Journal of Applied Polymer Science 100, no. 1 (2006): 368–71. http://dx.doi.org/10.1002/app.23123.

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38

Krenceski, Mary A., and Julian F. Johnson. "Shear, tack, and peel of polyisobutylene: Effect of molecular weight and molecular weight distribution." Polymer Engineering and Science 29, no. 1 (January 1989): 36–43. http://dx.doi.org/10.1002/pen.760290108.

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39

Zanetti, F., E. Murano, and S. Paoletti. "Determination of Molecular Weight and Molecular Weight Distribution of Agar Fractions Extracted fromGracilaria dura." Planta Medica 58, S 1 (December 1992): 696. http://dx.doi.org/10.1055/s-2006-961718.

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40

Mohd Noor, Mohd Azmil, Tuan Noor Maznee Tuan Ismail, Vahid Sendijarevic, Christi M. Schiffman, Ibrahim Sendijarevic, Razmah Ghazali, and Zainab Idris. "Molecular Weight Distribution of Low Molecular Weight Polyols Derived from Fatty Acid Methyl Esters." Journal of the American Oil Chemists' Society 94, no. 3 (January 17, 2017): 387–95. http://dx.doi.org/10.1007/s11746-017-2950-x.

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41

Han, Taek Kyu, Hong Ki Choi, Dong Wook Jeung, Young Soo Ko, and Seong Ihl Woo. "Control of molecular weight and molecular weight distribution in ethylene polymerization with metallocene catalysts." Macromolecular Chemistry and Physics 196, no. 8 (August 1995): 2637–47. http://dx.doi.org/10.1002/macp.1995.021960816.

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42

Llorens, J., E. Rudé, and R. M. Marcos. "Prediction of Polymer Molecular Weight Distribution from Rheology: Polydimethylsiloxane Blends." Materials Science Forum 480-481 (March 2005): 281–86. http://dx.doi.org/10.4028/www.scientific.net/msf.480-481.281.

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We apply a model that connects rheological properties of linear polymer blends with their molecular weight distributions (MWDs). The model is based on the assumption that the relaxation time, ti, of a chain depends on an average molecular weight, M, which determines the effect of the environment where the molecule reptates, and its own molecular weight according to ti = (kE / 0 N G )·M 3.4 - b·Mi b where kE is the constant of proportionality between zero shear viscosity, ho, and weight average molecular weight, Mw, in unimodal polydisperse systems and 0 N G is the plateau modulus. We deduce that the MWD is related to the relaxation spectrum as H(t) = ( 0 N G /b)·M·W(M). Therefore, the MWD is obtained from the relaxation spectrum, which is deduced from the dynamic moduli, G’(w) and G’’(w), constrained by the plateau modulus, the zero shear viscosity and the steady state compliance, 0 e J . The maximum entropy method has been used to solve the integral equation that provides the relaxation spectra from experimental dynamic moduli. The model has been tested in polydimethylsiloxane blends with weight average molecular weight ranging from 94 to 630 kDa and polydispersity from 1.5 to 3.3. Good agreement is found between experimental and calculated MWDs.

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43

Eysturskarð, Jonhard, Ingvild J. Haug, Ann-Sissel Ulset, and Kurt I. Draget. "Mechanical properties of mammalian and fish gelatins based on their weight average molecular weight and molecular weight distribution." Food Hydrocolloids 23, no. 8 (December 2009): 2315–21. http://dx.doi.org/10.1016/j.foodhyd.2009.06.007.

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44

Zeng, Dong-Mei, Jue-Jing Pan, Qun Wang, Xin-Fang Liu, Hui Wang, and Ke-Qin Zhang. "Controlling silk fibroin microspheres via molecular weight distribution." Materials Science and Engineering: C 50 (May 2015): 226–33. http://dx.doi.org/10.1016/j.msec.2015.02.005.

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45

Tobita, Hidetaka, and Mamoru Nomura. "Molecular weight distribution in non-linear emulsion polymerization." Colloids and Surfaces A: Physicochemical and Engineering Aspects 153, no. 1-3 (August 1999): 119–22. http://dx.doi.org/10.1016/s0927-7757(98)00431-2.

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46

Farkas, Eszter, Zsolt G. Meszena, and Anthony F. Johnson. "Molecular Weight Distribution Design with Living Polymerization Reactions." Industrial & Engineering Chemistry Research 43, no. 23 (November 2004): 7356–60. http://dx.doi.org/10.1021/ie034329f.

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47

Tobita, Hidetaka. "Molecular weight distribution in free-radical crosslinking copolymerization." Macromolecules 26, no. 4 (July 1993): 836–41. http://dx.doi.org/10.1021/ma00056a039.

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48

Ohya, Norimasa, Junko Takizawa, Seiichi Kawahara, and Yasuyuki Tanaka. "Molecular weight distribution of polyisoprene from Lactarius volemus." Phytochemistry 48, no. 5 (July 1998): 781–86. http://dx.doi.org/10.1016/s0031-9422(97)00829-7.

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49

Lim, F. J., and W. R. Schowalter. "Wall Slip of Narrow Molecular Weight Distribution Polybutadienes." Journal of Rheology 33, no. 8 (November 1989): 1359–82. http://dx.doi.org/10.1122/1.550073.

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50

Siochi, Emilie J., Thomas C. Ward, Max A. Haney, and Bill Mahn. "The absolute molecular weight distribution of hydroxypropylated lignins." Macromolecules 23, no. 5 (September 1990): 1420–29. http://dx.doi.org/10.1021/ma00207a029.

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