Medium molecular weight multi-block copolymers of poly(L-lactic acid) (PLLA) and poly(butylene succinate) (PBS), MMW-mb(PLLA-PBS)s, were controlled-synthesized via melt block copolycondensation (bcMP) of two macromonomers, i.e. oligo-PLLA (OPLLA) and oligo-PBS (OPBS) with four creatinine (CR)-based organic guanidine (OG) catalysts. The catalytic performance of the four OGs is far superior to that of Sn(Oct)(2) in terms of molecular weight (M-w = 14.2 - 28.6 kDa versus 12.9 kDa), apparent yield of synthesized block copolymers (74.15% - 82.02%), as well as the by-product (lactide, LA) yield (1.08% - 6.71% versus 20.7%). Among the OGs, creatinine acetate (CRA) shows the best catalytic performance. H-1-NMR structural characterization of the MMW-mb(PLLA-PBS) synthesized with CRA indicates that the measured molar ratio of the two blocks, f(OPLLA)/f(OPBS), of MMW-mb(PLLA-PBS) is 89.3/10.7, close to the designed value (f(OPLLA0)/f(OPBS0) = 90/10). A high molecular weight (M-w = 114.0 kDa) block copolymer, HMW-mb(PLLA-PBS), was synthesized via be-MP of two macromonomers with CRA for the first time. The tensile strength of the block copolymer (50.67 MPa) is close to that of PLLA (54.10 MPa), and the elongation at break of the copolymer (BE = 60.66%) is 15 times greater than that of PLLA. TGA analysis indicates that the original decomposition temperature (T-d,T-0 = 272 degrees C) is 22 degrees C higher than that of PLLA. The molar ratio of two blocks, f(OPLLA)/f(OPBS) (89.7/10.3) in HMWmb(PLLA-PBS), measured by H-1-NMR, is very close to the designed value (90/10). This is the first controlled synthesis of multi-block copolymer of PLLA-PBS via be-MP with a biogenic guanidine-based catalyst CRA. The mechanism of the be-MP is proposed on the basis of experimental investigation.

Jellyfish,usually Rhopilema esculentum Kishinouye,as one of eight famous sea food in China,is always one of important tradition ocean fishery object with high economic value in China,which it is believed that jellyfish has not only sea food value,but also many medical functions. This paper mainly deals with the progress about jellyfish fishery in China,especially for the jellyfish pond culture which just developed in the early 21~(st) century.Jellyfish fishery in China can be divided into three stages,namely,the first stage of natural jellyfish population fishing before the 1980s,the second stage of experimental jellyfish population artificial enhancement between the 1980s and the 1990s,and the third stage of jellyfish pond culture booming since the 21~(st) century.Nowadays, jellyfish fishery has a good development prospect in China.According to some reported data,the value of jellyfish fishery in China should exceed 10 billion RMB per year,and the annual volume of international trade about jellyfish food would beyond one hundred million USD.Comparing with other traditional pond culture sea animal,jellyfish culture is a new thing just for several years.Either researches or managements about jellyfish fishery are not abundant,which may be adverse for jellyfish fishery and industry.