CV of Jun XU
Jun Xu, Dr.
Institute of Polymer Science & Engineering
Department of Chemical Engineering
Beijing 100084, China
1992 - 1997: Undergraduate study, Department of Chemical Engineering,
1997 - 2002: Ph. D. Study, Department of Chemical Engineering,
Supervisor: Prof. Zeng-Ming Zhang, Prof. Guo-Qiang Chen
2002 - 2005: Assistant Professor, Department of Chemical Engineering,
2005 - Present: Associate Professor, Department of Chemical Engineering,
2011.2- 2012.1: Alexander von Humboldt Research Fellow, Institute of Physics,
University of Freiburg, Germany,
Host: Prof. Günter Reiter
Polymer Processing and Applications
Lab course of Polymer Physics
(1) The real-time process and mechanism of lamellar twisting in the banded spherulites
The real-time growth process of twisting crystals were observed in situ under atomic force microscope. The twisting details and branching of lamellae were clearly revealed.
Figure 1. Real-time AFM phase images showing lamellar twisting The mark “E” indicates edge-on lamella and “F” indicates flat-on lamella. The arrows indicate screw dislocations contributing to backward growth. (Collaborated with Prof. Lin Li, published in Macromolecules, 2004, 37, 4118-4123.)
(2) Expression of chirality in polymer crystals on different structural levels.
Figure 2. Chiral growth of lamellar crystals of poly(D-lactide)
Figure 3. Twisting chirality of lamellar crystals in poly(R-3-hydroxyvalerate) depends on the radial growth axis: Lamellae twist in left-handed sense along the a axis and they twist in right-handed sense along b axis.（Macromolecules 2009, 42, 694-701）
(3) Characterization of semi-crystalline polymers via novel optical techniques, such as second harmonic generation imaging (collaborated with Prof. Hui Ma and Prof. Ping Xue, Department of Physics) and Mueller matrix microscopy (collaborated with Prof. Bart Kahr, New York University, USA).
(4) Chain conformation and crystallization of macromolecules confined in nano channels.
Figure 4. Transformed crystal (with elliptical boundary) in the matrix of metastable poly(ethylene oxide)/urea inclusion compound.
(5) Molecular process of nucleation of polymer crystallization: Experiments and theoretical modelling
Figure 5. Hoffman-Weeks plot with changing slope (a) and the corresponding crystallization line and melting line (b).
Figure 6. Scheme showing the secondary nucleation process of polymer lamellar crystals and the effect of lamellar width (w) on melting. (a) Secondary nucleation and growth of individual lamellar polymer cluster at the growth front, (b) coalescence of neighboring lamellar clusters provides another stabilization method of the newly formed lamellar clusters. (c) Scheme showing the effect of width of crystalline clusters on the melting line. （Macromolecules, 2016, 49, 2206−2215）
2. Structure-property relation in polymeric material
(1) Structure and properties of biodegradable polyesters
(2) Structure and properties of polymer-based nanocomposites
(3) Polymers for commercial 3-D printing
3. Biodegradable and biobased polymers
(1) Polyhydroxyalkanoates (PHA) and polylactide (PLA)
(2) Poly(butylene succinate) (PBS) and its copolymers.
(3) Biomimetic and smart polymer materials
4. Polymer materials for energy storage
(1) Microporous polyolefin films for lithium battery
(2) Dielectric polymer nanocomposite film
(3) Solid polymer electrolyte
Alexander von Humboldt Research Fellowship for Experienced Researchers
Feng Xingde Polymer Prize for winning "The Best Paper Nomination from China" published in the journal of Polymer in 2011
New Century Excellent Talents in University
ACS 3-year membership award
1. Zhong Z, Yang XT, Guo BH, Xu J*, Huang YB*. Dissolution behavior of the crystalline inclusion complex formed by the drug diflunisal and poly(ε-caprolactone). Cryst. Growth Des. 2017, 17, 355−362.
2. Xu J*, Heck B, Ye HM, Jiang J, Tang YR, Liu J, Guo BH, Reiter R, Zhou DS, Reiter R. Stabilization of nuclei of lamellar polymer crystals: Insights from a comparison of the Hoffman−Weeks line with the crystallization line. Macromolecules, 2016, 49, 2206−2215.
3. Ye HM, Wang RD, Liu J, Xu J*, Guo BH*. Isomorphism in Poly(butylene succinate-co-butylene fumarate) and Its Application as Polymeric Nucleating Agent for Poly(butylene succinate). Macromolecules 2012, 45, 5667-5675.
4. Ye HM, Xu J*, Freudenthal J, Kahr B*. On the Circular Birefringence of Polycrystalline Polymers: Polylactide. J. Am. Chem. Soc.,2011,133,13848–13851.
5. Liu J, Ye HM, Xu J*, Guo BH. Formation of ring-banded spherulites of a and b modifications in poly(butylene adipate). Polymer 2011, 52, 4619-4630.
6. Xu J*, Guo BH. Poly(butylene succinate) and its copolymers: Research, development and industrialization. Biotechnol J 2010, 5, 1149–1163. (Invited review)
7. Ye HM, Wang JS, Tang S, Xu J*, Feng XQ*, et al. Surface Stress Effects on the Bending Direction and Twisting Chirality of Lamellar Crystals of Chiral Polymer. Macromolecules 2010, 43, 5762–5770.
8. Ye HM, Xu J*, Guo BH*, Iwata T. Left- or Right-Handed Lamellar Twists in Poly[(R)-3-hydroxyvalerate] Banded Spherulite: Dependence on Growth Axis. Macromolecules 2009, 42, 694-701. (Cover article)
9. Xu J*, Bao J, Guo BH, Ma H*, Yun TL, Gao L, Chen GQ, Iwata T. Imaging of Nonlinear Optical Response in Biopolyesters via Second Harmonic Generation Microscopy and Its Dependence on the Crystalline Structures. Polymer 2007, 48, 348-355.
10. Xu J, Guo BH, Zhang ZM, Zhou JJ, Jiang Y, Yan SK, Li L, Wu Q, Chen GQ, Schultz JM. Direct AFM Observation of Crystal Twisting and Organization in Banded Spherulites of Chiral Poly(3-hydroxybutyrate-co-3-hydroxyhexanoate). Macromolecules, 2004, 37, 4118-4123.