@article{HafidiElHatkaSchmitzetal.2024,
  author    = {Hafidi, Youssef and El Hatka, Hicham and Schmitz, Dominik and Krauss, Manuel and Pettrak, J{\"u}rgen and Biel, Markus and Ittobane, Najim},
  title     = {Sustainable soil additives for water and micronutrient supply: swelling and chelating properties of polyaspartic acid hydrogels utilizing newly developed crosslinkers},
  series = {Gels},
  volume    = {10},
  journal   = {Gels},
  number    = {3},
  publisher = {MDPI},
  address   = {Basel},
  issn      = {2310-2861},
  doi       = {10.3390/gels10030170},
  pages     = {Artikel 170},
  year      = {2024},
  abstract  = {Drought and water shortage are serious problems in many arid and semi-arid regions. This problem is getting worse and even continues in temperate climatic regions due to climate change. To address this problem, the use of biodegradable hydrogels is increasingly important for the application as water-retaining additives in soil. Furthermore, efficient (micro-)nutrient supply can be provided by the use of tailored hydrogels. Biodegradable polyaspartic acid (PASP) hydrogels with different available (1,6-hexamethylene diamine (HMD) and L-lysine (LYS)) and newly developed crosslinkers based on diesters of glycine (GLY) and (di-)ethylene glycol (DEG and EG, respectively) were synthesized and characterized using Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM) and regarding their swelling properties (kinetic, absorbency under load (AUL)) as well as biodegradability of PASP hydrogel. Copper (II) and zinc (II), respectively, were loaded as micronutrients in two different approaches: in situ with crosslinking and subsequent loading of prepared hydrogels. The results showed successful syntheses of di-glycine-ester-based crosslinkers. Hydrogels with good water-absorbing properties were formed. Moreover, the developed crosslinking agents in combination with the specific reaction conditions resulted in higher water absorbency with increased crosslinker content used in synthesis (10\% vs. 20\%). The prepared hydrogels are candidates for water-storing soil additives due to the biodegradability of PASP, which is shown in an exemple. The incorporation of Cu(II) and Zn(II) ions can provide these micronutrients for plant growth.},
  language  = {en}
}
@article{GrosshauserPettrak2023,
  author    = {Großhauser, Christian and Pettrak, J{\"u}rgen},
  title     = {Die Rolle des Wasserstoffs in der Abwasserbehandlung},
  series = {Wasser und Abfall},
  journal   = {Wasser und Abfall},
  number    = {7/8},
  publisher = {Springer Fachmedien},
  address   = {Wiesbaden},
  issn      = {1436-9095},
  doi       = {10.1007/s35152-023-1444-4},
  year      = {2023},
  abstract  = {Die Bereitstellung von nachhaltig erzeugtem Wasserstoff als Energietr{\"a}ger und Rohstoff ist eine wichtige Schl{\"u}sseltechnologie sowohl als Ersatz f{\"u}r fossile Energietr{\"a}ger, aber auch als Produkt im Zusammenhang mit Kreislaufprozessen. In der Abwasserbehandlung bestehen verschiedene M{\"o}glichkeiten Wasserstoff herzustellen. Mehrere Wege, m{\"o}gliche Synergien, aber auch deren Nachteile werden vorgestellt.},
  language  = {de}
}
@article{RieplPettrakFaulstichetal.2010,
  author    = {Riepl, Herbert Matthias and Pettrak, J{\"u}rgen and Faulstich, Martin and Herrmann, Wolfgang Anton},
  title     = {Self metathesis of fatty alcohols and amines to provide monomers for polyester and polyamide products},
  series = {Macromolecular Symposia},
  volume    = {293},
  journal   = {Macromolecular Symposia},
  number    = {1},
  publisher = {Wiley-VCH},
  address   = {Weinheim},
  issn      = {1521-3900 (eISSN)},
  doi       = {10.1002/masy.200900041},
  pages     = {39 -- 42},
  year      = {2010},
  abstract  = {Self metathesis of oleochemicals offers a variety of bifunctional compounds, that can be used as monomer for polymer production. Many precursors are in huge scales available, like oleic acid ester (biodiesel), oleyl alcohol (tensides), oleyl amines (tensides, lubricants). We show several ways to produce and separate and purify C18-α,ω-bifunctional compounds, using Grubbs 2nd Generation catalysts, starting from technical grade educts.},
  language  = {en}
}
@phdthesis{Pettrak2010,
  author    = {Pettrak, J{\"u}rgen},
  title     = {Nutzung nachwachsender Rohstoffe bei der Herstellung thermoplastischer Elastomere aus Folgeprodukten der Olefinmetathese},
  publisher = {Technische Universit{\"a}t M{\"u}nchen},
  address   = {M{\"u}nchen},
  pages     = {137 Seiten},
  year      = {2010},
  abstract  = {Metathese von {\"O}ls{\"a}ure und Derivaten ist ein interessanter Weg f{\"u}r die Synthese bifunktioneller Verbindungen aus nachwachsenden Rohstoffen. Verwendet wurden Ru-Katalysatoren der zweiten Generation, welche eine hohe Toleranz gegen{\"u}ber funktionellen Gruppen und Verunreinigungen aufweisen. Trotz des Einsatzes technischer Edukte waren Umsetzungen mit niedrigen Katalysatormengen (0.001 - 0.01 mol-\%) m{\"o}glich, mit Ausbeuten entsprechend der Literatur. Kreuzmetathesen erm{\"o}glichten variable Kettenl{\"a}ngen und Funktionalit{\"a}ten der Monomere, die Produktgewinnung ist jedoch aufw{\"a}ndig. Selbstmetathese lieferte C18-bifunktionelle Verbindungen, welche einfach durch Destillation oder Kristallisation isoliert werden k{\"o}nnen. Neben der katalystischen Umsetzung wurde auch die Produktgewinnung untersucht und f{\"u}r ausgew{\"a}hlte Produkte auch im gr{\"o}ßeren Maßstab durchgef{\"u}hrt.},
  language  = {de}
}
@book{Pettrak2014,
  author    = {Pettrak, J{\"u}rgen},
  title     = {Nutzung nachwachsender Rohstoffe bei der Herstellung thermoplastischer Elastomere aus Folgeprodukten der Olefinmetathese},
  publisher = {Attenkofer},
  address   = {Straubing},
  isbn      = {978-3-942742-35-1},
  pages     = {147 Seiten},
  year      = {2014},
  language  = {de}
}