简介：TheenzymatichydrolysisofmacromoleculargelatinwithAS1.398neutralprotease,bromelainandtheircombinationswasstudiedbyestimatingthemolecularweightsoftheirhydrolyticproducts.Itwasdiscoveredthattheproductshydrolyzedbyusingcombinationenzymeshadlowermolecularweightthanthoseobtainedbyusingsingleones,andthekindofenzymes,theircombinationmodeandadditionsequenceareeffectivewaystocontrolthemolecularweightsofgelatinhydrolyzates.

简介：Polymerizationofacrylonitrile(AN)inaqueousnitricacidinitiatedbypolypropylene-basedpolyamidoxime(PPAO)-thiourea(TU)combinationhasbeeninvestigated.Theoverallrateofpolymerization(R_p)undertheconditionsof[TU]/[PPAO]<0.5molarratioisThemolecularweightsofthepolymerswerefoundtobeinverselyproportionalto3/2-powerofnitricacidconcentrationand1-powerofthioureaconcentration.Inaddition,itisindependentwiththeconcentrationsofmonomerandPPAO,anddecreaseswithincreasingtemperature.Onthebasisoftheseexperimentalresults,acoordination-protontransfermechanismfortheinitiationwasproposedanddiscussed.

简介：glutamic酸(LG)和丁氨二酸酸(ASP)的随机的共聚物，poly(LG-co-ASP)，能成功地与debenzylation经由N-carboxyanhydride戒指开始copolymerization的联合与设计作文被综合。-benzyl-L-glutamateN-carboxyanhydride(BLG-NCA)和-benzyl-LaspartateN-carboxyanhydride(BLA-NCA)的戒指开始copolymerizations被使用不同的胺包括执行象开始者的triethylamine(茶)，diethylamine，n-hexylamine(NHA)，triphenylamine，二苯胺或苯胺。所有6胺是高度有效的poly变得明确(BLG-co-BLA)共聚物与尽管聚合经由不同机制(正常的胺机制或/并且激活的单体机制)继续了，设计了作文，它基于胺的化学结构。分子的重量(BLG-co-BLA)poly，共聚物能被茶集中和聚合时间调停。然后，debenzylation(BLG-co-BLA)poly，共聚物被进行准备相应吸水的随机的共聚物(LG-co-ASP)poly以ASP结构的单位与子单元组织。LG结构的单位在的内容(LG-co-ASP)poly，共聚物在NCA单体BLG-NCA与那些匹配在NHA或茶开始并且接近了理论线的戒指洞copolymerizations喂。diblock共聚物(BLG-b-BLA)能被BLGNCA和BLA-NCA的顺序的增加也poly经由生活NCA戒指洞copolymerization综合。