Due to the irreversibility of covalent bonds, traditional polymer materials are difficult to restore to their initial properties after damage through repair, making them difficult to recycle. To reduce resource waste, there is an urgent need to develop repairable and recyclable polymer materials, which include polymers based on dynamic covalent bonds. The following figure shows the preparation process of the polymer PDMS-Boroxine:

<MultiModal>![`O=C(O)C1=CC=C(B(O)O)C=C1` obtains $\bf{A}$ under the action of $SOCl_2$, and then reacts with the polymer, whose basic structure is `C[Si](C)(CCCN)O[Si](C)(C)CCCN` (degree of polymerization is 1), the repeating unit is `C[Si](C)([*])O[*]` ([*] represents the position where the polymer monomer is bonded), to obtain PDMS-Boroxine](/media/uploads/2f85478e-1c77-4ff6-8535-c1abb571d727.png)</MultiModal>

Monomer $\bf{1}$ obtains $\bf{B}$, similar to $\bf{A}$, under the action of molecular sieves. $\bf{B}$ undergoes a condensation reaction with $\bf{2}$ to obtain a thermosetting polymer $\bf{C}$. These polymers have flexible self-healing mechanisms.

<MultiModal>![The structure of $\bf{1}$ is `OB(O)C1=C(C=O)C=CC=C1`, the basic structure of polymer $\bf{2}$ is `CC(COCC(O)COC(NCCOCCOCCN)=O)COCC(O)COC(NCCOCCOCCN)=O` (degree of polymerization is 1), the repeating unit is `CC([*])CO[*]` ([*] represents the position where the polymer monomer is bonded)](/media/uploads/680d3643-1d75-4dfa-beea-82c5abe7b820.png)</MultiModal>

The following statements are made:

1. $\bf{A}$ has 4 six-membered rings

2. PDMS-Boroxine is a linear polymer

3. Studies have shown that PDMS-Boroxine has good self-healing properties. The prepared PDMS-Boroxine was cut into two pieces, the two cut surfaces were wetted with water and the two cut surfaces were brought into contact with each other, and after drying at 70 degrees Celsius for 24 hours, it was found that the two cut surfaces were bonded together. This process involves changes in the form of boron-containing groups

4. In addition to self-healing under conditions similar to those in statement 3, $\bf{C}$ can also achieve self-healing under heating conditions. The realization of this process mainly involves changes in the form of boron-containing groups.

Select the option that contains all the correct statements
由于共价键的不可逆性，传统聚合物材料在损伤后很难通过修复恢复其初始性能，也就难以循环利用。为了减少资源浪费，急需发展可修复与可循环利用的聚合物材料，其中便包括了基于动态共价键的聚合物。下图为聚合物PDMS-Boroxine的制备过程：

<MultiModal>![`O=C(O)C1=CC=C(B(O)O)C=C1`在$SOCl_2$作用下得到$\bf{A}$，随后和聚合物反应，其基本结构为`C[Si](C)(CCCN)O[Si](C)(C)CCCN`（聚合度为1），重复单元为`C[Si](C)([*])O[*]`（[*]表示聚合物单体成键的位置），得到PDMS-Boroxine](/media/uploads/2f85478e-1c77-4ff6-8535-c1abb571d727.png)</MultiModal>

单体$\bf{1}$在分子筛作用下得到与$\bf{A}$类似的$\bf{B}$。$\bf{B}$与$\bf{2}$发生缩合反应可得到一种热固性聚合物$\bf{C}$。这类聚合物具有灵活的自愈合机制。

<MultiModal>![$\bf{1}$的结构为`OB(O)C1=C(C=O)C=CC=C1`，聚合物$\bf{2}$的基本结构为`CC(COCC(O)COC(NCCOCCOCCN)=O)COCC(O)COC(NCCOCCOCCN)=O`（聚合度为1），重复单元为`CC([*])CO[*]`（[*]表示聚合物单体成键的位置）](/media/uploads/680d3643-1d75-4dfa-beea-82c5abe7b820.png)</MultiModal>

有以下说法：

1.$\bf{A}$有4个六元环

2.PDMS-Boroxine为线型高分子

3.研究表明，PDMS-Boroxine具有良好的自愈合性能。将制得的PDMS-Boroxine切割成两块，用水浸湿两个切面并使两切面相互接触，于70摄氏度条件下干燥24小时后，发现两切面发生了粘合。这一过程涉及其中含硼基团存在形式的变化

4.除了能在说法3类似的条件下自愈合外，$\bf{C}$在加热条件下也能实现自愈合。这一过程的实现主要涉及其中含硼基团存在形式的变化。

选出所含说法全部正确的选项
All statements are incorrect.
1
2
3
4
1,2
1,3
1,4
2,3
2,4
3,4
1,2,3
1,2,4
1,3,4
2,3,4
1,2,3,4
所有说法均不正确
1
2
3
4
1,2
1,3
1,4
2,3
2,4
3,4
1,2,3
1,2,4
1,3,4
2,3,4
1,2,3,4
Thionyl chloride is a strong dehydrating agent and chlorinating agent, which converts carboxyl groups into more reactive acyl chlorides and also dehydrates boronic acid groups. Three molecules of boric acid will lose three molecules of water to form a six-membered ring composed of alternating three boron atoms and three oxygen atoms. The structure of $\bf{A}$ is thus: `O=C(Cl)C(C=C1)=CC=C1B2OB(C3=CC=C(C(Cl)=O)C=C3)OB(C4=CC=C(C(Cl)=O)C=C4)O2`.

<Checkpoint>[The structure of $\bf{A}$ is: `O=C(Cl)C(C=C1)=CC=C1B2OB(C3=CC=C(C(Cl)=O)C=C3)OB(C4=CC=C(C(Cl)=O)C=C4)O2`, which has 4 six-membered rings. Statement 1 is correct](1)</Checkpoint>

Subsequently, the acyl chloride of $\bf{A}$ reacts with the amino groups in the polymer molecule to produce PDMS-Boroxine, where the functionality of $\bf{A}$ is 3, and each polymer molecule has two amino groups, with a functionality of 2. The average polymerization functionality of the two must be greater than 2, so PDMS-Boroxine is a bulk polymer.

<Checkpoint>[The average functionality of PDMS-Boroxine is greater than 2, so it is a bulk polymer. Statement 2 is incorrect](1)</Checkpoint>

Cutting the polymer breaks the chemical bonds at the cut surface. The addition of water will shift the chemical equilibrium to the left, causing the boroxine ring at the cut surface to hydrolyze, regenerating boronic acid groups. Bringing the two cut surfaces into contact and heating will evaporate the water, promoting the re-dehydration condensation of the boronic acid groups at the interface, forming new boroxine rings. These newly formed chemical bonds "stitch" the two cut surfaces together, achieving healing.

<Checkpoint>[Adding water causes the boroxine ring to hydrolyze to produce boric acid, and subsequent heating dehydrates the boric acid, forming bonds between the cross-sections to achieve adhesion. Statement 3 is correct](1)</Checkpoint>

Under the action of molecular sieves, $\bf{1}$ dehydrates to produce $\bf{B}$ similar to $\bf{A}$: `O=CC1=CC=CC=C1B2OB(C3=CC=CC=C3C=O)OB(C4=CC=CC=C4C=O)O2`. Subsequently, the aldehyde group reacts with the amino group in $\bf{2}$ to produce an imine, generating $\bf{C}$ similar to PDMS-Boroxine. Since the formation of imine is a dynamic equilibrium, under heating conditions, trace amounts of free amino groups in the system will attack the imine, thereby realizing the reversible exchange of imine bonds. Since chain segment movement becomes easier under heating conditions, the active groups on the two cut surfaces can approach and react, thereby achieving the self-healing process.

<Checkpoint>[Under heating conditions, a small amount of free amino groups of $\bf{C}$ can attack the imine group, realizing the reversible exchange of imines, thereby achieving self-healing. Statement 4 is incorrect](1)</Checkpoint>

Statements 1 and 3 are correct, select G.

The structures of $\bf{A}$ and $\bf{B}$ are shown below:

<MultiModal>![$\bf{A}$：`O=C(Cl)C(C=C1)=CC=C1B2OB(C3=CC=C(C(Cl)=O)C=C3)OB(C4=CC=C(C(Cl)=O)C=C4)O2`；$\bf{B}$：`O=CC1=CC=CC=C1B2OB(C3=CC=CC=C3C=O)OB(C4=CC=CC=C4C=O)O2`](/media/uploads/db2fcd51-8693-4385-a4a7-50bd8a19a2d0.png)</MultiModal>
亚硫酰氯是一个强脱水剂和氯化剂，会将羧基转化为更活泼的酰氯，也会使硼酸基团脱水。三分子硼酸会脱去三分子水，形成一个由三个硼原子和三个氧原子交替组成的六元环。则$\bf{A}$的结构为：`O=C(Cl)C(C=C1)=CC=C1B2OB(C3=CC=C(C(Cl)=O)C=C3)OB(C4=CC=C(C(Cl)=O)C=C4)O2`。

<Checkpoint>[$\bf{A}$的结构为：`O=C(Cl)C(C=C1)=CC=C1B2OB(C3=CC=C(C(Cl)=O)C=C3)OB(C4=CC=C(C(Cl)=O)C=C4)O2`，有4个六元环，说法1正确](1)</Checkpoint>

随后$\bf{A}$的酰氯与聚合物分子中的氨基反应，产生PDMS-Boroxine，其中$\bf{A}$的官能度为3，每个聚合物分子中有两个氨基，官能度为2，二者聚合平均官能度一定大于2，则PDMS-Boroxine为体型高分子。

<Checkpoint>[PDMS-Boroxine平均官能度大于2，为体型高分子，说法2错误](1)</Checkpoint>

将聚合物切开，破坏了切面处的化学键，水的加入会使化学平衡向左移动，导致切面处的硼氧六环水解，重新生成硼酸基团。将两个切面接触，加热会使水蒸发，促使界面处的硼酸基团重新脱水缩合，形成新的硼氧六环。这些新形成的化学键将两个切面“缝合”在一起，实现愈合。

<Checkpoint>[加入水后导致硼氧六环水解产生硼酸，随后加热使得硼酸脱水，在断面间成键实现粘合，说法3正确](1)</Checkpoint>

在分子筛作用下$\bf{1}$脱水产生类似$\bf{A}$的$\bf{B}$：`O=CC1=CC=CC=C1B2OB(C3=CC=CC=C3C=O)OB(C4=CC=CC=C4C=O)O2`，随后醛基与$\bf{2}$中的氨基反应产生亚胺，生成类似于PDMS-Boroxine的$\bf{C}$。由于亚胺的形成是一个动态平衡，加热条件下，体系中微量的游离氨基会进攻亚胺，从而实现亚胺键的可逆交换。由于加热条件下链段运动变得更加容易，两个切面上的活性基团得以靠近发生反应，进而实现自愈合过程。

<Checkpoint>[加热条件下$\bf{C}$的少量游离氨基可以进攻亚胺基团，实现亚胺的可逆交换，进而实现自愈合。说法4错误](1)</Checkpoint>

说法1，3正确，选G

$\bf{A}$和$\bf{B}$的结构如下所示：

<MultiModal>![$\bf{A}$：`O=C(Cl)C(C=C1)=CC=C1B2OB(C3=CC=C(C(Cl)=O)C=C3)OB(C4=CC=C(C(Cl)=O)C=C4)O2`；$\bf{B}$：`O=CC1=CC=CC=C1B2OB(C3=CC=CC=C3C=O)OB(C4=CC=CC=C4C=O)O2`](/media/uploads/db2fcd51-8693-4385-a4a7-50bd8a19a2d0.png)</MultiModal>