Kinetic analysis of mechanoradical formation during the mechanolysis of dextran and glycogen

• Naoki Doi,
• Yasushi Sasai,
• Yukinori Yamauchi,
• Tetsuo Adachi,
• Masayuki Kuzuya and
• Shin-ichi Kondo

Beilstein J. Org. Chem. 2017, 13, 1174–1183, doi:10.3762/bjoc.13.116

• initiate the polymerization is frequently used to synthesize such a graft polymer [7]. Dextran (Dx), a biodegradable polysaccharide, has been utilized as a graft copolymer backbone. The glycosidic linkages between the α-glucose units of Dx synthesized from Leuconostoc mesenteroides are composed of

Stimuli-responsive HBPS-g-PDMAEMA and its application as nanocarrier in loading hydrophobic molecules

• Yongsheng Chen,
• Li Wang,
• Haojie Yu,
• Zain-Ul-Abdin,
• Ruoli Sun,
• Guanghui Jing,
• Rongbai Tong and
• Zheng Deng

Beilstein J. Org. Chem. 2016, 12, 939–949, doi:10.3762/bjoc.12.92

• nanocarriers for loading guest molecules is dynamic. It has been widely studied in applications including drug controlled release, smart sensing, catalysis, and modeling. In this paper, a graft copolymer (hyperbranched polystyrene)-g-poly[2-(dimethylamino)ethyl methacrylate] (HBPS-g-PDMAEMA) was synthesized

• ]. Produced HBPS is tethered with lot of peripheral chlorine atoms available for further modification or functional chain extension. Here, we prepared a hyperbranched graft copolymer HBPS-g-PDMAEMA. HBPS segments behaved as hyperbranched topology support and also as hydrophobic segment to give HBPS-g-PDMAEMA

• obtained HBPS was used as macro initiator to polymerize DMAEMA through ATRP. The comparison of GPC curves in Figure 1C showed that the curve of the graft copolymer was shifted to less elution time. The GPC results show Mn of HBPS to be 4.4 kg/mol with a molecular weight distribution of 1.85 and Mn of HBPS

Influence of cyclodextrin on the solubility of a classically prepared 2-vinylcyclopropane macromonomer in aqueous solution

• Helmut Ritter,
• Jia Cheng and
• Monir Tabatabai

Beilstein J. Org. Chem. 2012, 8, 1528–1535, doi:10.3762/bjoc.8.173

• ß-cyclodextrin in water. Via radical ring-opening copolymerization of 5 and NiPAAm a graft copolymer 8 with a clouding point of 32 °C was synthesized. The branched unsaturated polymer was treated with ozone to cleave the double bonds of the main chain. Keywords: branched poly(NiPAAm); cloud point

• ; cyclodextrins; graft copolymer; macromonomer; ring-opening free radical polymerization; 2-vinylcyclopropane; Introduction Macromonomers are polymers or oligomers with at least one functional end group that is capable of further polymerization. The molecular weight of macromonomers generally ranges between 1000

• prefers to form only dimers in presence of a radical initiator rather than a homopolymer, a graft copolymer 8 was formed via radical ring-opening copolymerization of 5 and NiPAAm. The double bonds of the main chain can be cleaved simply by ozone treatment. Experimental All chemicals were commercially

Formation of epoxide-amine oligo-adducts as OH-functionalized initiators for the ring-opening polymerization of ε-caprolactone

• Julia Theis and
• Helmut Ritter

Beilstein J. Org. Chem. 2010, 6, 938–944, doi:10.3762/bjoc.6.105

• were used as the initiator for the ring-opening polymerization of ε-caprolactone to produce a graft copolymer. Keywords: addition oligomerization; epoxide-amine adducts; microwave; ring-opening polymerization; transfer hydrogenation; Introduction In the last decade the use of microwave (MW

• higher molecular weight products. Ring-opening polymerization of ε-caprolactone The epoxide-amine adduct 4 was used for preparation of graft copolymer 6 via ring-opening polymerization (ROP) of ε-caprolactone (ε-CL, 5), where the secondary hydroxy groups of 4 act as the initiator. This ROP was catalyzed

• shows a melting point (Tm) at 50 °C while PCL homopolymer crystallizes at about 55 °C. Obviously the backbone of copolymer 6 reduces the crystalline order. Conclusion A graft copolymer (6) was synthesized via ring-opening polymerization of ε-caprolactone using an epoxide-amine addition product 4 as an